Global Slewing Bearing Market Outlook 2026-2031  

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Understanding the Slewing Bearing Market

A slewing bearing is a large rotating component that supports heavy loads while enabling rotation between two structures. These bearings handle axial loads, radial loads, and tilting moments simultaneously. They are essential in construction equipment, wind turbines, solar trackers, and industrial machinery.

The global slewing bearing market is growing steadily. Multiple research reports confirm this trend, though estimates vary slightly by source. According to TechSci Research, the market was valued at approximately USD 5.14 billion in 2025 and is expected to reach USD 6.92 billion by 2031, growing at a CAGR of 5.0% during the forecast period of 2026 to 2031. Another report projects growth from USD 985 million in 2025 to USD 1,441 million by 2031, at a CAGR of 6.5% over the 2026-2031 period. A Chinese language report estimates the 2025 global market at 49.9 billion yuan (approximately USD 7 billion), with a forecast CAGR of 5.45% through 2032.

These figures show a consistent picture: the slewing bearing market will continue expanding through 2031, driven by renewable energy, infrastructure investment, and industrial automation.

Key Drivers of Slewing Bearing Market Growth

Renewable Energy Expansion

Wind and solar energy projects represent the largest growth opportunity for the slewing bearing market. Wind turbines require both pitch bearings (for blade angle adjustment) and yaw bearings (for nacelle orientation). As turbines grow larger, these slewing bearings must handle higher loads and operate reliably for decades.

The shift toward offshore wind is accelerating this demand. Offshore wind accounted for about 1.8% of total renewable capacity and is growing rapidly. Offshore installations require specialized slewing bearings with higher load capacity and better corrosion resistance. Double-row tapered roller bearings and three-row roller slewing rings are increasingly specified for these demanding applications.

Solar trackers also rely on slewing bearings. These systems rotate photovoltaic panels to follow the sun, increasing energy yield by 20-35% compared to fixed installations. Utility-scale solar farms require hundreds or thousands of tracking units, each containing a slewing bearing or slew drive.

Infrastructure and Construction Investment

Global urbanization continues to drive demand for construction equipment. Every excavator, crane, and aerial work platform depends on a slewing ring to rotate the upper structure relative to the undercarriage. Demand for these slewing bearings tracks closely with infrastructure spending.

The trend toward modular construction and heavier lifts is pushing demand for high-load-capacity slewing bearings. Mobile, tower, and crawler cranes increasingly require larger diameter slewing rings with greater tilting moment capacity.

Industrial Automation and Emerging Applications

Beyond traditional heavy machinery, slewing bearings are finding new applications. Industrial robots use precision slewing bearings for joint rotation. Medical equipment like CT scanners and MRI machines require slewing bearings with zero clearance, low noise, and extremely high rotational precision. While smaller in physical size, the medical segment offers high margins for manufacturers.

Regional Analysis of the Slewing Bearing Market

Asia Pacific: The Dominant Region

Asia Pacific leads the global slewing bearing market. Major manufacturing industries in China and India drive demand. China alone represents a significant portion of global consumption, with the Chinese market estimated at 19.1 billion yuan (approximately USD 2.7 billion) in 2025.

The region’s dominance comes from its position as both a manufacturing hub and a major consumer of construction equipment. China’s Belt and Road Initiative and India’s infrastructure development programs continue to generate demand for construction machinery and the slewing bearings they require.

North America: Renewable Energy Growth

North America shows significant growth potential for slewing bearings, particularly from the expanding renewable energy sector. The United States leads the region, with wind farm development and solar installations driving demand for slewing bearings.

Europe: Strong Growth in Wind Energy

Europe is projected to experience steady growth in slewing bearing demand, driven by construction machinery demand and ambitious renewable energy targets. The EU’s Green Deal and REPowerEU initiatives accelerate wind energy adoption, increasing demand for pitch and yaw bearings.

Other Regions: Infrastructure Development

The Middle East and Africa show moderate growth in slewing bearing demand due to infrastructure development initiatives. Latin America is expected to witness a surge in demand fueled by growing construction activities. Each region has varying growth opportunities based on industrial development and infrastructure projects.

Product Segments in the Slewing Bearing Market

By Bearing Type

The slewing bearing market segments by rolling element type: ball bearings and roller bearings. Roller bearings, particularly three-row and crossed roller designs, are gaining share due to higher load capacity and better durability for demanding applications.

Crossed roller slewing ring bearings represent the fastest growing segment. These slewing bearings offer superior rigidity and precision, making them ideal for wind turbines, robotics, and precision equipment.

By Gear Configuration

Slewing bearings come in internal gear, external gear, and gearless configurations. The choice depends on the application’s drive system and space constraints. External gears are common in solar trackers and construction equipment, while internal gears are often used in compact designs.

By Application

Wind and solar energy is the largest and fastest-growing application segment for slewing bearings. Industrial machinery, including construction and mining equipment, remains the volume leader. Medical equipment, aerospace and defense, and oil and gas represent specialized segments with specific slewing bearing requirements.

Challenges Facing the Slewing Bearing Market

Raw Material Price Volatility

Steel price fluctuations create significant challenges for slewing bearing manufacturers. High-grade steel, typically grades like 42CrMo or 50Mn, is the primary input material. The quality of steel directly impacts the fatigue life of the slewing bearing raceway.

When steel prices fluctuate unpredictably, producers struggle to estimate production costs. This volatility often leads to eroded profit margins or forced cost increases for customers. According to the World Steel Association, global steel demand was projected to decline by 0.9% in 2024, reversing earlier forecasts of recovery. Such shifts create a precarious planning environment for slewing bearing manufacturers.

Energy Costs

European slewing bearing manufacturers face particular challenges from energy cost disadvantages compared to Asian competitors. This cost pressure affects pricing and competitiveness in global markets.

Certification Requirements

Certification bodies like DNV or ABS are standard requirements for marine and offshore applications of slewing bearings. These certifications create barriers to entry for lower-tier manufacturers, but they also add cost and complexity to the supply chain.

Technology Trends in Slewing Bearings

Smart Bearings and IoT Integration

The integration of Internet of Things (IoT) sensors for predictive maintenance is transforming the slewing bearing industry. Embedded sensor arrays can monitor axial and radial wear, grease condition, and structural stress in real-time.

According to Modern Construction News, digital bearing clearance monitoring systems can reduce equipment downtime by up to 75% by eliminating the need for physical inspections in difficult-to-access machinery zones. This capability is particularly valuable for offshore wind farms where slewing bearing maintenance access is challenging.

Advanced Materials

Hybrid ceramic and steel configurations are evolving to meet both performance requirements and decarbonization targets. Ceramic rolling elements provide electrical insulation and speed capabilities. Manufacturers are also innovating metallurgical composition to reduce environmental impact.

Low-carbon steel produced via electric arc furnaces is gaining adoption. SKF reported that using renewable-energy-manufactured GreenSteel Climate+ reduced carbon dioxide emissions from bearing components by 40% compared to standard steel production methods.

Remanufacturing and Circular Economy

Major slewing bearing manufacturers are developing remanufacturing programs to support circular economy goals. Extending the life of large-diameter slewing bearings through reconditioning reduces waste and lowers total cost of ownership for equipment operators.

Competitive Landscape of the Slewing Bearing Market

The slewing bearing market features a mix of established Western technology leaders and rapidly expanding Chinese manufacturers.

Global Tier-1 Leaders

thyssenkrupp rothe erde leads in high-end slewing bearing applications, particularly wind and tunnel boring sectors. Their reputation is built on material science and large-diameter manufacturing capacity.

Schaeffler AG invests in “Industry 4.0” features, integrating sensors for real-time slewing bearing condition monitoring. SKF Group focuses on total lifecycle management, offering slewing bearings, lubrication systems, and monitoring services.

The Timken Company is renowned for tapered roller bearing technology. JTEKT Corporation (Koyo brand) is known for high precision and reliability.

Key Players in the Market

Other significant players include NSK Ltd., La Leonessa, and multiple Chinese manufacturers like Zhejiang Tianma Bearing Group, WaFangdian Rolling Bearing, and Xuzhou Helin Slewing Bearing.

The market concentration shows the top five slewing bearing manufacturers accounting for approximately 33.8% of the market share, with competition intensifying as Chinese manufacturers improve quality and expand capacity.

How LDB Bearing Positions in the Growing Slewing Bearing Market

LDB Bearing (Luoyang Longda Bearing Co., Ltd.) serves this expanding global slewing bearing market with a comprehensive product portfolio. The company manufactures single-row four-point contact ball bearings, double-row ball bearings, crossed roller bearings, and three-row roller bearings. Sizes range from small diameters to over 2,000mm.

LDB’s market strengths:

  • Quality commitment: ISO 9001-certified manufacturing with documented inspection reports and full material traceability
  • Material integrity: Verified 42CrMo and 50Mn forged alloy steel with induction-hardened raceways achieving 55–62 HRC
  • Comprehensive product range: All major slewing bearing types with internal, external, or gearless configurations
  • Global reach: Serving 73 countries with over 500,000 units in service
  • Engineering support: Application engineering for load calculations, finite element analysis, and custom slewing bearing designs

As the slewing bearing market grows toward USD 6.9 billion by 2031, LDB’s combination of quality manufacturing, engineering expertise, and global logistics positions the company to serve customers across renewable energy, construction, and emerging industrial applications.

Contact LDB Bearing today to discuss your slewing bearing requirements.

FAQs

1. What is the projected growth rate of the global slewing bearing market?
The global slewing bearing market is expected to grow at a CAGR of 5.0% to 6.5% from 2026 to 2031, reaching USD 6.9 to 14.4 billion depending on the report source.

2. Which region dominates the slewing bearing market?
Asia Pacific dominates the slewing bearing market, driven by major manufacturing industries in China and India. China alone represents a significant portion of global consumption.

3. What are the main applications driving slewing bearing demand?
Wind and solar energy is the fastest-growing application segment for slewing bearings. Construction equipment remains the volume leader. Medical equipment, robotics, and other emerging applications are creating new demand.

4. How does the offshore wind market affect slewing bearing demand?
Offshore wind requires specialized slewing bearings with higher load capacity and corrosion resistance. Double-row tapered roller bearings and three-row roller slewing rings are increasingly specified for offshore installations.

5. What are the key challenges in the slewing bearing market?
Steel price volatility creates uncertainty for slewing bearing manufacturers. European producers face energy cost disadvantages. Certification requirements add complexity for marine and offshore applications.

Luoyang LDB Bearing Showcased Heavy-Duty Slewing Solutions at CTT Expo 2026 in Moscow

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Luoyang Longda Bearing Co., Ltd. (LDB), specializing in the design, engineering, and manufacturing of large-scale slewing bearings and precision slew drives, proudly concluded its official participation in the prestigious CTT Expo 2026 (The 26th International Trade Fair for Construction Machinery and Technologies). The flagship industry event was successfully held from May 26 to 29, 2026, at the Crocus Expo International Exhibition Center in Moscow.

As the premier and largest construction machinery exhibition in Russia and Eastern Europe, CTT Expo 2026 reached an unprecedented scale this year, hosting over 1,700 exhibitors and attracting more than 80,000 professional visitors across an expansive 215,000-square-meter venue. For LDB, this strategic exhibition provided a world-class platform to demonstrate its technological breakthroughs and heavy-duty machinery components to global heavy industries, infrastructure developers, and aftermarket distributors throughout the Eurasian and Eastern European regions. Throughout the four-day event, LDB’s booth attracted hundreds of industry experts, generating substantial international procurement inquiries and reinforcing LDB’s position as a premium domestic supplier.

At the exhibition, LDB prominently showcased three core product categories that were meticulously engineered to withstand severe working loads, extreme ambient temperatures, and continuous mechanical stress. The exhibits drew massive attention from heavy machinery OEMs and maintenance engineers:

  • Excavator Slewing Bearings: Specially optimized for both high-end OEM integrations and rapid aftermarket replacements, these bearings attracted significant interest from fleet managers. LDB’s excavator bearings are fully compatible with major global excavator brands, including Komatsu, Caterpillar, Hitachi, Kobelco, and Doosan. Visitors were particularly impressed by the optimized internal clearances and reinforced, multi-lip seal structures designed to endure frequent high-impact digging forces while effectively preventing dust, mud, and water contamination on harsh construction sites.
  • Truck Crane Slewing Bearings: Engineered for maximum tipping moment resistance and smooth, step-free rotation, these bearings are critical for ensuring the operational safety and millimeter-level positioning accuracy of mobile and truck-mounted cranes. LDB demonstrated how its specialized internal geometry handles complex combined loads, which is vital for preventing structural tilting during high-altitude lifting operations.
  • Forestry Machinery Slewing Bearings: Designed for heavy-duty wilderness operations, these robust bearings are built to withstand asymmetric shock loads, severe tilting moments, and extreme temperature fluctuations. Distributors from northern regions highly praised these products for their reliability in log loaders, harvesters, and feller bunchers operating in sub-zero forestry environments.

The four days in Moscow proved to be highly fruitful for the LDB international business team. By engaging in face-to-face technical consultations and commercial negotiations, LDB secured multiple preliminary purchasing agreements and established long-term strategic partnerships with several prominent machinery distributors and engineering groups.

The interactive displays at the LDB booth allowed global buyers to experience the smooth rotation and structural integrity of LDB’s engineering firsthand. Many clients expressed deep appreciation for LDB’s ability to offer bespoke CAD customizations and rapid manufacturing turnarounds, which are essential for minimizing heavy machinery downtime and maximizing project profitability.

Participating in CTT Expo 2026 was a key milestone in LDB’s ongoing international strategic layout. Driven by technology and backed by decades of proven field performance, LDB remains fully committed to manufacturing high-end slewing bearings and slew drives that global heavy industries can rely on. We look forward to reinforcing our ties with the Eastern European and Eurasian markets during this premier event, continuously driving engineering efficiency forward. For more inquiries, product brochures, or tailored quotes, please contact us directly at Tony@ldb-bearing.com.

Delivery of CAT Excavator Slewing Bearing to South America

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In June 2023, our company successfully delivered a Four-Point Contact Ball Slewing Bearing for a CAT excavator to a client in South America. The customer required a reliable slewing ring to support heavy-duty applications such as mining and earthmoving. We supplied a four-point contact ball slewing bearing, which features a single raceway design with four contact points per ball, allowing it to simultaneously handle axial loads, radial loads, and tilting moments.

This bearing type offers a compact cross-section, high load efficiency, and smooth rotation, making it an ideal match for CAT excavators. After rigorous factory testing—including dimensional accuracy, hardness, and gear inspection—we prepared the bearing for shipment. In June 2023, we shipped the unit via a dedicated South America logistics route, applying anti-corrosion treatment and reinforced packaging to ensure safe delivery.

Upon arrival, the client confirmed successful installation and reported excellent performance. The four-point contact ball slewing bearing delivered stable slewing, low vibration, and reduced noise during daily excavator operations. This case once again demonstrates our ability to provide application-specific slewing bearings for leading brands like CAT, with on-time delivery to customers across South America.

What Is a Four-Point Contact Ball Slewing Bearing?

A Four-Point Contact Ball Slewing Bearing is a large-scale precision bearing that supports heavy rotating structures. It mainly consists of an inner ring, an outer ring, a single row of steel balls, a cage (or spacer), and a sealing device. Both the inner and outer rings come in either integral or split structures. The integral ring offers strong rigidity, while the split design allows for easy adjustment. For split structures, LDB uses bolts to connect the two split rings before the product leaves the factory.

Most four-point contact ball slewing bearings include a cage or spacer. However, we use a full-ball structure only when the application demands a relatively large load capacity. The full-ball design provides higher bearing capacity but creates greater frictional resistance, which can easily cause scratches on the surface of the steel balls. The basic structure of a four-point contact ball slewing bearing may include no gear, external gear, or internal gear teeth, delivering high static load capacity for demanding applications.

How Does a Four-Point Contact Ball Slewing Bearing Work?

The working principle of a four-point contact ball slewing bearing relies on a single row of steel balls running in arc-shaped raceways. Each steel ball makes contact with the raceway at four points—two on the inner ring and two on the outer ring. This unique geometry allows the bearing to accept axial loads from either direction, radial loads, and tilting moments simultaneously.

When an external load applies to the bearing, the steel balls transfer forces across the four contact points. The distribution of load changes depending on the direction of the force. For vertical axial loads, all four contact points share the load. For combined loads, some contact points carry more force while others unload. This dynamic load distribution gives the bearing its ability to handle complex loading conditions in a single raceway.

The drive mechanism—usually a pinion gear—engages the internal or external gear teeth on the bearing ring. As the pinion rotates, it drives the bearing ring to turn, allowing the attached structure to rotate smoothly with minimal friction.

Key Features of Four-Point Contact Ball Slewing Bearings

Four-point contact ball slewing bearings from LDB offer several distinctive features that make them suitable for a wide range of applications:

  • Compact structure: The single-row design combines two seat rings into a lightweight, space-saving package.
  • Four-point contact geometry: Steel balls contact arc raceways at four points, enabling the bearing to bear axial force, radial force, and tilting moment at the same time.
  • Dual ring structure options: Choose between integral rings for maximum rigidity or split rings for easier adjustment during installation.
  • Flexible gear configurations: Available without gear, with internal gear, or with external gear teeth.
  • Wide size range: Outer diameters from 200mm to 10,000mm, inner diameters from 100mm to 8,000mm, ball diameters from 30mm to 75mm, and rated loads from 129kN to 3,410kN.
  • High-quality materials: LDB uses 42CrMo and 50Mn steel for superior strength and durability.
  • Effective sealing: Nitrile rubber seals protect the bearing from contaminants and retain lubricant.
  • Precision heat treatment: Normalizing hardness reaches 187HB-241HB, quenched and tempered hardness reaches 229HB-269HB, and raceway quenching hardness achieves HRC 55-62.
  • Short delivery time: LDB offers delivery within 10 to 30 days.
  • 12-month warranty: Every bearing comes with a full one-year warranty against manufacturing defects.

Main Types of Four-Point Contact Ball Slewing Bearings

Based on gear configuration, four-point contact ball slewing bearings fall into three main types:

1. Non-Gear Type (No Gear)
This type has no gear teeth machined into the inner or outer ring. It suits applications where an external drive mechanism provides rotation independently of the bearing.

2. External Gear Type
The outer ring features gear teeth on its external surface. A pinion gear engages these teeth from outside the bearing. This configuration works well when the drive motor sits outside the rotating structure.

3. Internal Gear Type
The inner ring carries gear teeth on its internal surface. The pinion gear mounts inside the bearing ring. This design offers a cleaner layout and better protection for the gear system.

Each type allows LDB to match the bearing precisely to your mechanical design. We also offer both integral ring and split ring structures for each gear configuration.

Core Advantages of Four-Point Contact Ball Slewing Bearings

Four-point contact ball slewing bearings provide significant advantages over other bearing types:

Single bearing replaces multiple bearings
One four-point contact ball slewing bearing handles axial loads, radial loads, and tilting moments simultaneously. You do not need separate thrust bearings and radial bearings in your assembly.

Compact and lightweight design
The single-row structure occupies minimal space and adds little weight to your equipment. This helps you design more compact machinery.

High static load capacity
The four-point contact geometry distributes loads efficiently, allowing the bearing to support very high static loads without permanent deformation.

Bi-directional axial load capability
Unlike many bearings that handle axial load in only one direction, the four-point contact design accepts axial forces from either direction equally well.

Smooth rotation with low torque
Precision-ground raceways and high-quality steel balls deliver quiet, low-friction rotation, reducing power consumption and wear.

Long service life
With proper lubrication and maintenance, LDB’s four-point contact ball slewing bearings provide years of reliable continuous operation.

Customizable sealing and cage design
Based on your working environment, LDB can optimize the sealing structure and internal fixator to match your specific conditions.

Common Applications of Four-Point Contact Ball Slewing Bearings

Four-point contact ball slewing bearings from LDB serve a wide variety of industries and equipment:

Construction machinery
These bearings perform excellently in rotary conveyors, welding robots, manipulators, small and medium cranes, and excavators. The ability to handle combined loads makes them ideal for equipment that rotates under heavy weight.

Tower garage parking systems
Automated parking systems rely on four-point contact ball slewing bearings to rotate car-carrying platforms smoothly and accurately.

Crane and hoist equipment
Mobile cranes, tower cranes, and shipboard cranes use these bearings for their slewing mechanisms.

Excavators and earthmoving machines
Both medium and small excavators benefit from the compact size and high load capacity of four-point contact bearings.

Wind turbines
Some yaw and pitch systems in wind turbines use four-point contact slewing bearings for their ability to handle combined loads in outdoor environments.

Medical equipment
Large medical imaging devices and robotic surgery systems use these bearings for precise rotational positioning.

How to Select the Right Four-Point Contact Ball Slewing Bearing?

Selecting the correct four-point contact ball slewing bearing requires careful consideration of several factors:

Load requirements
Calculate the maximum axial load, radial load, and tilting moment your application will generate. LDB’s rated load range of 129kN to 3,410kN covers most medium to heavy-duty applications. Provide your load data to our engineers for accurate sizing.

Gear configuration
Decide whether you need no gear, internal gear, or external gear teeth based on your drive system layout. Internal gears suit designs where the motor mounts inside the bearing ring. External gears work when the motor sits outside.

Ring structure
Choose between integral ring for maximum rigidity or split ring for easier adjustment during installation. LDB pre-assembles split rings with bolts before delivery.

Size dimensions
Specify your required inner diameter (100mm to 8,000mm) and outer diameter (200mm to 10,000mm). Ball diameter (30mm to 75mm) affects load capacity and rotational smoothness.

Sealing requirements
Standard nitrile rubber seals suit most environments. For harsh conditions, LDB can design special sealing structures to protect against dust, moisture, and contaminants.

Heat treatment specifications
Verify that hardness levels meet your application needs. LDB provides normalizing hardness of 187HB-241HB, quenched and tempered hardness of 229HB-269HB, and raceway quenching hardness of HRC 55-62.

Cage or full-ball design
Use a cage design for most applications. Choose full-ball structure only when you need maximum load capacity and can accept higher friction.

Delivery time
LDB offers standard delivery within 10 to 30 days. For urgent requirements, please contact us to discuss expedited options.

Non-standard models
If your application requires a non-standard model, LDB can design and manufacture according to your specific requirements. We have commonly used standard models in stock, and our engineering team can develop custom solutions for any project.

LDB: Custom Four-Point Contact Ball Slewing Bearings Manufacturer

LDB specializes in the design, production, and supply of high-quality four-point contact ball slewing bearings. We serve customers across Asia, South America, Europe, and the Middle East, providing reliable components for construction machinery, parking systems, cranes, excavators, and more.

Our manufacturing capabilities
We produce four-point contact ball slewing bearings with outer diameters from 200mm to 10,000mm and inner diameters from 100mm to 8,000mm. Ball diameters range from 30mm to 75mm, and rated loads span from 129kN to 3,410kN. Our materials include 42CrMo and 50Mn steel, both known for their excellent strength, toughness, and wear resistance.

Quality assurance
Every bearing undergoes rigorous quality testing before leaving our factory. We inspect dimensional accuracy, hardness, gear teeth, and raceway surface quality. Our heat treatment process includes normalizing, quenching and tempering, and raceway induction hardening to achieve the required hardness levels.

Customization options
LDB provides a complete set of slewing bearings without gears, with external gears, with internal gears, or individual ring gears according to your requirements. For split ring designs, we connect the two split rings with bolts before shipment to simplify your installation. We can also optimize the sealing structure and internal fixator based on your working environment.

Packaging and delivery
We package each bearing using metal brackets or export standard fumigation-free wooden boxes. This ensures safe transportation to any global destination. Our standard delivery time is 10 to 30 days.

Technical support
Our engineering team can recommend the exact bearing model for your design or develop a fully custom solution. Whether you need a standard model or a non-standard design, we work closely with you to meet your specifications.

Warranty
All LDB four-point contact ball slewing bearings come with a 12-month warranty against manufacturing defects. We stand behind the quality and reliability of every product we ship.

Contact LDB today to discuss your four-point contact ball slewing bearing requirements. Provide your load data, size specifications, gear configuration, and any special requirements. We will respond with a competitive quote, technical recommendations, and a reliable delivery schedule.

LDB (Luoyang Longda Bearing) Shines at Hannover Messe: Spur Gear Slew Drive Technology Leads New Trends in Rotary Transmission

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Core Exhibit: Spur Gear Slew Drive, Defining New Standards for Efficient Transmission

At this exhibition, LDB’s featured spur gear slew drive became the center of attention. Unlike traditional worm gear structures, LDB’s spur gear slew drive achieves higher transmission efficiency, lower backlash, and stronger load capacity through “spur gear meshing + high-rigidity integrated design,” perfectly meeting the stringent requirements of industrial automation for high-precision, high-reliability rotary components.

The core advantages of LDB’s spur gear slew drive are vividly reflected in multiple key application scenarios:
Automated Robot Arm Bases: Low backlash and high repeat positioning accuracy ensure precise and controllable movements of robot arms during high-speed operations, providing stable support for processes such as precision assembly and handling.
Palletizers: High torque output and impact-resistant structure easily handle frequent starts and stops under heavy-duty conditions, ensuring efficient and safe palletizing operations.
AGVs (Automated Guided Vehicles): Compact design and stable power output adapt to the space constraints of AGV bodies, enabling flexible steering and heavy-load traction in intelligent logistics systems.
Positioners: High rigidity and continuous operation capability meet the needs of multi-angle precise workpiece flipping during welding and machining, improving production efficiency and process stability.
Radar Antennas: Low-noise and high-precision rotary control ensures smooth operation and signal tracking of radar antennas in complex environments.
Special Equipment Such as Armored Vehicles: Military-grade quality with strong impact resistance and high reliability can withstand extreme tests under harsh working conditions, providing critical guarantees for the stable operation of special equipment.

Technical Strength: Solid Support from “Made in China” to “Created in China”

As the only domestic enterprise mastering the core technology of spur gear slew drives, LDB’s spur gear slew drive not only achieves full-process independent R&D and production but also breaks foreign technical monopolies through multiple technological breakthroughs. From gear profile optimization and material selection to precision machining and rigorous testing, every spur gear slew drive undergoes multi-process quality control to ensure its performance in efficiency, accuracy, service life, and environmental adaptability meets international advanced standards.
At the exhibition, customers from Europe, the Middle East, Southeast Asia, and other regions stopped at the LDB booth one after another, showing strong interest in the technical principles, application cases, and customized solutions of the spur gear slew drive. The on-site engineering team provided one-on-one technical consultations and solution discussions based on customers’ different working conditions, with many customers reaching preliminary cooperation intentions on the spot.

Looking Ahead: Centered on Spur Gear Slew Drives, Expanding a New Ecosystem of Global Cooperation

Hannover Messe is an important step for LDB to enter the global market and a brilliant debut of China’s high-end rotary transmission technology on the world stage. In the future, LDB will continue to deepen the core technology of spur gear slew drives, continuously optimize product performance, expand application scenarios, and embrace global cooperation with an open attitude. It will provide efficient, reliable, and customized rotary drive solutions for more industry customers, allowing “Made in China” to shine brighter on the global industrial stage.

Delivery of Volvo Excavator Slewing Bearing to South America

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In July 2022, our company successfully delivered a Four-Point Contact Ball Slewing Bearing for a Volvo excavator to a client in South America. The customer required a high-performance slewing ring to support demanding applications such as earthmoving, construction, and infrastructure projects. We supplied a four-point contact ball slewing bearing, which features a single raceway design with four contact points per ball, allowing it to handle axial loads, radial loads, and tilting moments simultaneously.

This bearing type offers a compact cross-section, high load efficiency, and smooth rotation, making it an ideal match for Volvo excavators. After rigorous factory testing—including dimensional accuracy, hardness, gear inspection, and raceway quenching hardness verification (HRC 55-62)—we prepared the bearing for shipment. In July 2022, we shipped the unit via a dedicated South America logistics route, applying anti-corrosion treatment and reinforced export-standard fumigation-free wooden box packaging to ensure safe delivery.

Upon arrival, the client confirmed successful installation and reported excellent performance. The four-point contact ball slewing bearing delivered stable slewing, low vibration, and reduced noise during daily excavator operations. This case once again demonstrates our ability to provide application-specific slewing bearings for leading brands like Volvo, with on-time delivery to customers across South America. LDB offers a 12-month warranty, delivery within 10-30 days, and full customization including internal gear, external gear, or non-gear options.

What Are Four-Point Contact Ball Slewing Bearings?

Four-point contact ball slewing bearings are large-scale precision bearings that support heavy rotating structures in demanding machinery. A four-point contact ball slewing bearing mainly consists of an inner ring, an outer ring, a single row of steel balls, a cage (or spacer), and a sealing device. Both the inner and outer rings come in either integral or split structures. The integral ring offers strong rigidity, while the split design allows for easy adjustment. For split structures, LDB uses bolts to connect the two split rings before the product leaves the factory.

Most four-point contact ball slewing bearings include a cage or spacer. However, manufacturers use a full-ball structure only when the application demands a relatively large load capacity. The full-ball design provides higher bearing capacity but creates greater frictional resistance. This friction can easily cause scratches on the surface layer of the steel balls. The basic structure of a four-point contact ball slewing bearing may include no gear, external gear, or internal gear teeth, delivering high static load capacity for demanding applications.

How Does a Four-Point Contact Ball Slewing Bearing Work?

The working principle of a four-point contact ball slewing bearing relies on a single row of steel balls running in arc-shaped raceways. Each steel ball makes contact with the raceway at four points—two on the inner ring and two on the outer ring. This unique geometry allows the bearing to accept axial loads from either direction, radial loads, and tilting moments simultaneously.

When an external load applies to the bearing, the steel balls transfer forces across the four contact points. The distribution of load changes depending on the direction of the force. For vertical axial loads, all four contact points share the load. For combined loads, some contact points carry more force while others unload. This dynamic load distribution gives the bearing its ability to handle complex loading conditions in a single raceway. The drive mechanism—usually a pinion gear—engages the internal or external gear teeth on the bearing ring. As the pinion rotates, it drives the bearing ring to turn, allowing the attached structure to rotate smoothly with minimal friction.

Structural Features of Four-Point Contact Ball Slewing Bearings

Four-point contact ball slewing bearings possess several distinctive structural features that make them suitable for a wide range of applications. The single-row four-point contact ball slewing bearing consists of two seat rings, offering a compact structure and light weight. The four-point contact between the steel ball and the arc raceway enables the bearing to bear axial force, radial force, and tilting moment at the same time.

LDB manufactures these bearings with outer diameters ranging from 300mm to 10,000mm and ball diameters from 30mm to 75mm. Rated loads span from 129kN to 3,410kN, covering most medium to heavy-duty applications. The materials used include 42CrMo and 50Mn steel, both known for their excellent strength and wear resistance. The seal type is nitrile rubber, which provides effective protection against contaminants while retaining lubricant. The rolling body is a steel ball, and the heat treatment process delivers normalizing hardness of 187HB-241HB, quenched and tempered hardness of 229HB-269HB, and raceway quenching hardness of HRC 55-62. LDB offers a 12-month warranty on all products, with delivery times of 10 to 30 days.

Main Configuration Types of Four-Point Contact Ball Slewing Bearings

Based on gear configuration, four-point contact ball slewing bearings fall into three main types:

1. Non-Gear Type (No Tooth)
This type has no gear teeth machined into the inner or outer ring. It suits applications where an external drive mechanism provides rotation independently of the bearing.

2. External Gear Type (External Tooth)
The outer ring features gear teeth on its external surface. A pinion gear engages these teeth from outside the bearing. This configuration works well when the drive motor sits outside the rotating structure.

3. Internal Gear Type (Internal Tooth)
The inner ring carries gear teeth on its internal surface. The pinion gear mounts inside the bearing ring. This design offers a cleaner layout and better protection for the gear system.

Each type allows LDB to match the bearing precisely to your mechanical design. We also offer both integral ring and split ring structures for each gear configuration. The features include four-point contact with internal tooth, external tooth, or no tooth options.

Core Advantages of Four-Point Contact Ball Slewing Bearings

Four-point contact ball slewing bearings provide significant advantages over other bearing types:

Single bearing replaces multiple bearings
One four-point contact ball slewing bearing handles axial loads, radial loads, and tilting moments simultaneously. You do not need separate thrust bearings and radial bearings in your assembly.

Compact and lightweight design
The single-row structure consists of two seat rings, occupying minimal space and adding little weight to your equipment. This helps you design more compact machinery.

High static load capacity
The four-point contact geometry distributes loads efficiently, allowing the bearing to support very high static loads without permanent deformation.

Bi-directional axial load capability
Unlike many bearings that handle axial load in only one direction, the four-point contact design accepts axial forces from either direction equally well.

Smooth rotation with low torque
Precision-ground raceways and high-quality steel balls deliver quiet, low-friction rotation, reducing power consumption and wear.

Long service life
This series of slewing ring suits main engines that require large axial load capacity, high overturning moment resistance, long service life, and continuous operation.

Customizable sealing and cage design
According to the requirements of the supporting working environment, LDB can optimize the design of the sealing structure and the internal fixator.

Common Applications of Four-Point Contact Ball Slewing Bearings

Four-point contact ball slewing bearings from LDB serve a wide variety of industries and equipment:

Construction machinery
These bearings perform excellently in rotary conveyors, welding robots, manipulators, small and medium cranes, and excavators. The ability to handle combined loads makes them ideal for equipment that rotates under heavy weight.

Tower garage parking systems
Automated parking systems rely on four-point contact ball slewing bearings to rotate car-carrying platforms smoothly and accurately.

Crane and hoist equipment
Mobile cranes, tower cranes, and shipboard cranes use these bearings for their slewing mechanisms.

Excavators and earthmoving machines
Both medium and small excavators benefit from the compact size and high load capacity of four-point contact bearings.

Wind turbines
Some yaw and pitch systems in wind turbines use four-point contact slewing bearings for their ability to handle combined loads in outdoor environments.

Medical equipment
Large medical imaging devices and robotic surgery systems use these bearings for precise rotational positioning.

Key Factors When Choosing a Four-Point Contact Ball Slewing Bearing

Selecting the correct four-point contact ball slewing bearing requires careful consideration of several factors:

Load requirements
Calculate the maximum axial load, radial load, and tilting moment your application will generate. LDB’s rated load range of 129kN to 3,410kN covers most medium to heavy-duty applications. Provide your load data to our engineers for accurate sizing.

Gear configuration
Decide whether you need no gear, internal gear, or external gear teeth based on your drive system layout. Internal gears suit designs where the motor mounts inside the bearing ring. External gears work when the motor sits outside.

Ring structure
Choose between integral ring for maximum rigidity or split ring for easier adjustment during installation. LDB pre-assembles split rings with bolts before delivery.

Size dimensions
Specify your required inner diameter (100mm to 8,000mm) and outer diameter (200mm to 10,000mm). Ball diameter (30mm to 75mm) affects load capacity and rotational smoothness.

Sealing requirements
Standard nitrile rubber seals suit most environments. For harsh conditions, LDB can design special sealing structures to protect against dust, moisture, and contaminants.

Heat treatment specifications
Verify that hardness levels meet your application needs. LDB provides normalizing hardness of 187HB-241HB, quenched and tempered hardness of 229HB-269HB, and raceway quenching hardness of HRC 55-62.

Cage or full-ball design
Use a cage design for most applications. Choose full-ball structure only when you need maximum load capacity and can accept higher friction.

Delivery time
LDB offers standard delivery within 10 to 30 days. For urgent requirements, please contact us to discuss expedited options.

Non-standard models
LDB has commonly used standard models available. For non-standard models, we can design and manufacture according to customer requirements.

LDB: Custom Four-Point Contact Ball Slewing Bearings Manufacturer

LDB is an enterprise specializing in the design, development, manufacture, and sales of precision slewing bearings (slewing rings) and precision slewing drives. As a professional slewing ring supplier, we provide high-performance small and large slewing rings to customers worldwide.

Unlike other providers of slewing bearings, LDB can offer fully tailored slewing bearing solutions with integrated advanced monitoring, lubrication, and sealing systems for higher reliability and longer service life. Our wide range of expert slewing bearing services also helps cut costs and optimize performance, while our global presence allows slewing bearing solutions and services to be delivered quickly around the world.

Customization capabilities
LDB provides a complete set of slewing bearings without gears, external gears, internal gears, or individual ring gears according to customer requirements. We can optimize the sealing structure and internal fixator based on your specific working environment. For split ring designs, we connect the two split rings with bolts before shipment to simplify your on-site installation.

Quality assurance
Every bearing undergoes rigorous quality testing before leaving our factory. We inspect dimensional accuracy, hardness, gear teeth, and raceway surface quality. Our heat treatment process includes normalizing, quenching and tempering, and raceway induction hardening to achieve the required hardness levels of HRC 55-62 on the raceway.

Packaging and delivery
We package each bearing using metal brackets or export standard fumigation-free wooden boxes. This ensures safe transportation to any global destination. Our standard delivery time is 10 to 30 days, and we offer a 12-month warranty on all products.

Technical support
LDB has commonly used standard models in stock. For non-standard requirements, our engineering team can design and manufacture according to your specifications. Whether you need a standard model or a fully custom solution, we work closely with you to meet your requirements.

Contact LDB today to discuss your four-point contact ball slewing bearing needs. Provide your load data, size specifications, gear configuration, and any special requirements. We will respond with a competitive quote, technical recommendations, and a reliable delivery schedule.

Delivery of Doosan Excavator Slewing Bearing to South America

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In November 2022, our company successfully delivered a Four-Point Contact Ball Slewing Bearing for a Doosan excavator to a client in South America. The customer needed a high-performance slewing ring to support demanding applications such as earthmoving, construction, and infrastructure development. We supplied a four-point contact ball slewing bearing, which features a single row of steel balls with four contact points between each ball and the raceway. This design allows the bearing to withstand axial loads, radial loads, and tilting moments simultaneously.

Manufactured from high-strength 42CrMo and 50Mn steel, this bearing offers a compact structure, light weight, and high static load capacity ranging from 129kN to 3,410kN. LDB provides outer diameters from 200mm to 10,000mm, inner diameters from 100mm to 8,000mm, and ball diameters from 30mm to 75mm to meet various excavator models. After rigorous factory testing including dimensional inspection, hardness testing (raceway quenching hardness HRC 55-62), and gear accuracy verification, we shipped the bearing in November 2022. We used anti-corrosion treatment and export-standard fumigation-free wooden boxes for secure ocean freight to South America.

The customer confirmed successful installation and reported that the four-point contact ball slewing bearing delivered smooth rotation, low noise, and stable performance under daily operating conditions. LDB provides a 12-month warranty, 10-30 day delivery, and flexible gear options including internal gear, external gear, or non-gear configurations. For split ring designs, we pre-connect the two split rings with bolts before shipment to simplify on-site installation. This case further demonstrates our capability to serve Doosan excavator users across South America with custom-engineered slewing solutions.

What Are Four-Point Contact Ball Slewing Bearings?

A four-point contact ball slewing bearing is a specialized heavy-load bearing that enables smooth rotation in large machinery. The main components include an inner ring, an outer ring, a single row of steel balls, a cage or spacer, and a sealing device. Manufacturers offer both integral and split designs for the inner and outer rings. An integral ring provides excellent rigidity, while a split ring gives you more flexibility during adjustment. For split designs, LDB uses bolts to fasten the two split rings together before shipping.

Most of these bearings come with a cage or spacer. However, when your application demands extra load capacity, a full-ball design works better. Keep in mind that full-ball bearings carry more load but also create higher friction. This friction may lead to surface scratches on the steel balls over time. You can order four-point contact ball slewing bearings with no gear, external gear, or internal gear teeth. All configurations deliver impressive static load capacity for tough working conditions.

How Does a Four-Point Contact Ball Slewing Bearing Work?

The operating principle of this bearing type centers on the interaction between steel balls and arc-shaped raceways. Each steel ball touches the raceway at four distinct points—two points on the inner ring and two points on the outer ring. This clever geometry allows a single bearing to manage axial loads coming from either direction, radial loads, and tilting moments all at once.

When heavy forces enter the bearing, the steel balls distribute those forces across the four contact points. The load distribution shifts depending on the force direction. Pure vertical loads engage all four contact points evenly. Combined loads cause some points to carry more force while others relax. This dynamic behavior explains why one bearing can replace multiple bearing types in complex applications. A pinion gear drives the system by engaging the internal or external gear teeth on the bearing ring. As the pinion turns, the bearing ring rotates, and your equipment moves smoothly with very little friction.

Structural Features of Four-Point Contact Ball Slewing Bearings

These bearings stand out because of their smart structural design. The single-row configuration uses two seat rings, which keeps the whole assembly compact and surprisingly lightweight. The steel balls contact the arc raceway at four points, giving the bearing the ability to handle axial forces, radial forces, and tilting moments all in one unit.

LDB builds these bearings with outer diameters between 300mm and 10,000mm. Ball diameters range from 30mm to 75mm, while rated loads fall between 129kN and 3,410kN. We choose 42CrMo and 50Mn steel for their outstanding strength and resistance to wear. The seals use nitrile rubber, a material that keeps contaminants out and lubrication in. Heat treatment follows strict standards: normalizing hardness reaches 187HB-241HB, quenching and tempering delivers 229HB-269HB, and raceway quenching hits HRC 55-62. Every LDB bearing comes with a 12-month warranty and ships within 10 to 30 days.

Main Configuration Types of Four-Point Contact Spherical Slewing Bearings

You have three main choices when it comes to gear configuration:

Non-Gear Type (No Tooth)
This version has no gear teeth on either ring. It works perfectly when your drive system operates independently of the bearing itself.

External Gear Type (External Tooth)
The outer ring carries gear teeth on its outside surface. A pinion gear engages these teeth from the exterior. This setup fits applications where the drive motor sits outside the rotating part.

Internal Gear Type (Internal Tooth)
The inner ring holds gear teeth on its inside surface. The pinion mounts within the bearing ring. This arrangement gives you a cleaner look and adds protection to the gear mechanism.

LDB offers all three types, and we can match the gear configuration precisely to your mechanical layout. You also get to choose between integral and split ring structures. All options feature four-point contact with your selected tooth configuration.

Core Advantages of Four-Point Contact Spherical Slewing Bearings

Why do engineers choose four-point contact ball slewing bearings over other options? Here are the main benefits:

One bearing does the work of several
A single four-point contact ball slewing bearing handles axial loads, radial loads, and tilting moments together. You no longer need separate bearing types in your assembly.

Small and light
The single-row design uses just two seat rings. This simplicity saves valuable space and keeps weight low, helping you build more compact machinery.

Handles high static loads with ease
The four-point contact pattern spreads loads efficiently. The bearing can support extremely high static loads without permanent damage.

Works equally well for both axial directions
Many bearings only accept axial loads from one direction. This design accepts axial forces from either direction without any performance difference.

Turns smoothly with low resistance
Precision-ground raceways and quality steel balls deliver quiet, easy rotation. You get lower power consumption and reduced wear over time.

Built to last
This bearing series suits equipment that demands high axial loads, strong overturning moment resistance, continuous operation, and a long service life.

Customizable for your environment
Based on your specific working conditions, LDB can modify the sealing structure and internal fixator to match your needs.

Common Applications of Four-Point Contact Spherical Slewing Bearings

You will find these bearings working hard in many different types of equipment:

Construction machinery
Rotary conveyors, welding robots, manipulators, small and medium cranes, and excavators all rely on these bearings. Their ability to manage combined loads makes them perfect for rotating equipment under heavy weight.

Tower parking systems
Automated parking garages use four-point contact ball slewing bearings to rotate car platforms with precision and smoothness.

Cranes and hoists
Mobile cranes, tower cranes, and marine cranes all depend on these bearings for their slewing functions.

Excavators and earthmoving gear
Both medium-sized and small excavators benefit from the compact size and high load capacity of this bearing type.

Wind turbines
Many yaw and pitch systems in wind turbines use these bearings because they handle combined loads well in outdoor conditions.

Medical equipment
Large medical imaging machines and robotic surgery systems use these bearings for accurate rotational positioning.

Key Factors When Choosing a Four-Point Contact Ball Slewing Bearing

Before you order a slewing bearing, consider these important factors:

Load demands
Figure out the maximum axial load, radial load, and tilting moment your application will create. LDB’s rated load range of 129kN to 3,410kN suits most medium and heavy-duty jobs. Send your load data to our team for precise sizing.

Gear type
Pick no gear, internal gear, or external gear based on your drive layout. Internal gear works when your motor mounts inside the bearing ring. External gear fits when your motor sits outside.

Ring design
Choose integral ring for maximum rigidity. Choose split ring for easier adjustment during installation. LDB pre-assembles split rings with bolts before shipping to save you time.

Size specifications
Tell us your required inner diameter (100mm to 8,000mm) and outer diameter (200mm to 10,000mm). Ball diameter (30mm to 75mm) affects both load capacity and rotation smoothness.

Seal needs
Standard nitrile rubber seals work for most environments. For harsh or dusty conditions, LDB can create special sealing designs to keep contaminants away.

Hardness requirements
Check that hardness levels match your application. LDB delivers normalizing hardness of 187HB-241HB, quenched and tempered hardness of 229HB-269HB, and raceway hardness of HRC 55-62.

Cage vs. full-ball
Use a cage design for most standard applications. Choose the full-ball structure only when you need maximum load capacity and can accept higher friction.

Delivery schedule
LDB’s standard delivery takes 10 to 30 days. For urgent projects, contact us to discuss faster options.

Standard or custom
LDB keeps common standard models in stock. For non-standard requirements, we design and manufacture according to your exact specifications.

LDB: Custom Four-Point Contact Ball Slewing Bearings Manufacturer

LDB stands as a professional enterprise dedicated to the design, development, manufacturing, and sales of precision slewing bearings and slewing drives. We deliver high-performance small and large slewing rings to customers across the globe.

What makes LDB different from other suppliers? We offer fully customized slewing bearing solutions. Our team integrates advanced monitoring systems, lubrication mechanisms, and sealing technologies to give you higher reliability and extended service life. Our comprehensive service offerings help you reduce costs while optimizing performance. Thanks to our worldwide presence, we can deliver solutions and support quickly no matter where you are located.

Customization options
LDB supplies complete slewing bearing sets with no gear, external gear, internal gear, or individual ring gears based on your specific requirements. We can redesign the sealing structure and internal fixator to match your working environment perfectly. For split ring designs, we pre-connect the two halves with bolts before shipment to make your installation process easier.

Quality you can trust
Every bearing passes through rigorous quality checks before leaving our factory. We verify dimensional accuracy, hardness levels, gear quality, and raceway surface finish. Our heat treatment process includes normalizing, quenching and tempering, and induction hardening to achieve the target raceway hardness of HRC 55-62.

Packaging and shipping
Each bearing travels in a metal bracket or an export-standard fumigation-free wooden box. This packaging guarantees safe delivery to any destination worldwide. We back every product with a 12-month warranty and a standard lead time of 10 to 30 days.

Technical support
LDB maintains inventory of common standard models for quick shipment. For non-standard requirements, our engineering team designs and manufactures to your specifications. Whether you need a standard product or a fully custom solution, we work closely with you to meet your goals.

Contact LDB today to discuss your four-point contact ball slewing bearing requirements. Share your load data, size specifications, gear configuration, and any special needs. We will provide a competitive quote, technical recommendations, and a reliable delivery schedule.

Delivery of Komatsu Excavator Slewing Ring to South America

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In the field of construction machinery, the quality and timely delivery of slewing rings directly affect the stable operation of host equipment. In August 2021, our company successfully completed a supply task for a Komatsu excavator slewing ring to a client in South America. This case demonstrates our supply chain capability and professional understanding of the Four-Point Contact Ball Slewing Bearing.

The slewing ring supplied is of the four-point contact ball type. This bearing features a single raceway design where each ball contacts the raceway at four distinct points, allowing it to simultaneously withstand axial loads, radial loads, and tilting moments. Compared to other designs, it offers higher load efficiency, a compact cross-section, and good impact resistance, making it particularly suitable for excavators.

The client in South America explicitly requested a four-point contact ball slewing bearing for their Komatsu excavator. After order confirmation, our company strictly controlled every stage of production, inspection, and packaging. The slewing rings were shipped in August 2021 via a dedicated South America logistics route. Each unit underwent dimensional accuracy, rotational flexibility, hardness, and flaw detection tests to confirm compliance with Komatsu standards. Anti-corrosion treatment and reinforced packaging were applied for long-distance ocean transportation.

Upon arrival in South America, the slewing rings were installed and tested. The customer reported excellent performance, including low friction, high rigidity, and stable rotational accuracy, effectively reducing slewing noise and vibration. This case proves our company’s professional capability in critical components for construction machinery, from product selection and quality control to international logistics.

What is a Four Point Contact Ball Slewing Bearing?

A four point contact ball slewing bearing is a precision rotary component primarily composed of an inner ring, an outer ring, a single row of steel balls, a cage (or spacer), and sealing devices. Both the inner and outer rings can be manufactured as either integral or split structures. Integral rings offer higher rigidity, while split rings allow for easier adjustment. For split structures, bolts are used to connect the two split rings before the product leaves the factory.

This type of slewing bearing generally includes a cage or spacer to separate the balls. However, a full-ball (no cage) structure is used when load requirements are relatively high. The full-ball design provides larger load capacity but comes with higher frictional resistance, which can potentially cause scratches on the surface layer of the steel balls.

The basic structure of a four point contact ball slewing bearing is available in three gear configurations: without gear, with external gear, or with internal gear. All configurations offer high static load capacity. As a product of LDB (Luoyang Longda), this bearing type is manufactured with materials including 42CrMo and 50Mn, with nitrile rubber seals as standard.

How Does a Four Point Contact Ball Slewing Bearing Work?

The working principle of a four point contact ball slewing bearing is based on its unique Gothic arch raceway geometry. Unlike conventional ball bearings where the ball contacts the raceway at two points, this design allows each steel ball to make contact at four points – two on the inner ring and two on the outer ring.

When loads are applied, the contact points engage as follows:

  • Pure axial load in one direction: Two of the four contact points become active
  • Reversed axial load: The opposite pair of contact points engages
  • Combined loads (axial + radial + tilting moment): All four contact points share the load simultaneously

This load distribution mechanism enables a single-row bearing to perform functions that would otherwise require two separate rows. The single-row four-point contact ball slewing bearing consists of two seat rings, offering a compact structure and light weight. The four-point contact between the steel ball and the arc raceway allows the bearing to bear axial force, radial force, and tilting moment at the same time. This is achieved because the Gothic arch raceway profile creates a precise contact geometry that distributes loads efficiently across the bearing.

Key Features of Four Point Contact Ball Slewing Bearings

The four point contact ball slewing bearing offers a range of distinctive engineering features:

  • Single-row compact design: Consists of only two seat rings (inner and outer), providing a compact structure with light weight
  • Four-point contact geometry: Steel balls contact the arc raceway at four points, enabling combined load handling (axial, radial, and tilting moment simultaneously)
  • Multiple gear options: Available as no gear, internal gear, or external gear to suit various drive configurations
  • Flexible ring structure: Choice between integral rings (higher rigidity) and split rings (easier adjustment)
  • Cage or full-ball options: Caged designs for standard applications; full-ball designs for higher load capacity with the trade-off of increased friction
  • High static load capacity: Engineered to withstand demanding static and dynamic conditions
  • Wide dimensional range: Outer diameter from 300 mm to 10,000 mm, ball diameter from 30 mm to 75 mm
  • High load rating: Rated load from 129 kN to 3,410 kN
  • Fast delivery: Standard lead time of 10–30 days for custom orders

LDB specific features:

  • Materials: 42CrMo and 50Mn high-grade steel
  • Seal type: Nitrile rubber for effective contamination protection
  • Hardness: Normalizing hardness 187-241 HB, quenched and tempered hardness 229-269 HB, raceway quenching hardness HRC 55-62
  • Inner diameter range: 100 mm to 8,000 mm
  • Warranty: 12 months

Main Types of Four Point Contact Ball Slewing Bearings

Four point contact ball slewing bearings can be classified based on three main criteria: gear configuration, ring structure, and ball arrangement.

1. By gear configuration:

  • No gear (plain): For applications where the drive system does not require gear engagement
  • Internal gear: Gear teeth cut on the inner ring, suitable for compact drive designs where space is limited
  • External gear: Gear teeth cut on the outer ring, commonly used in excavators, cranes, and turntables

2. By ring structure:

  • Integral ring design: Higher rigidity, suitable for heavy-duty applications requiring maximum structural integrity
  • Split ring design: Allows for easier adjustment and maintenance; bolts connect the two split rings before the product leaves the factory

3. By ball arrangement:

  • Caged design: Standard configuration with spacers or cages to reduce friction and prevent ball-to-ball contact
  • Full-ball design: No cage or spacer, providing higher load capacity but increased frictional resistance; friction can also easily cause scratches on the surface layer of the steel ball

Core Advantages of Four Point Contact Ball Slewing Bearings

The four point contact ball slewing bearing offers several distinct advantages over other slewing bearing types:

  • Combined load capability: Can simultaneously bear axial force, radial force, and tilting moment within a single row, eliminating the need for multiple bearing arrangements
  • Compact and lightweight: The single-row two-seat-ring design saves space and reduces overall machine weight, making it ideal for mobile equipment
  • Bidirectional axial load support: Handles thrust loads from both directions without additional raceways or bearings
  • High static load capacity: Suitable for applications with heavy shock loads and intermittent rotation patterns common in construction machinery
  • Design flexibility: Customizable gear type (no gear, internal gear, external gear), ring structure (integral or split), and ball arrangement (caged or full-ball) to meet specific requirements
  • Long service life: Optimized sealing and lubrication options extend operational life, especially in harsh environments
  • Cost-effective: Lower manufacturing and maintenance costs compared to double-row or cross-roller alternatives
  • Fast customization: 10–30 day delivery for custom orders enables rapid project execution

LDB product advantages:

  1. This series of slewing ring is suitable for main engines requiring large axial load, high overturning moment, long service life, and continuous operation
  2. Sealing structure and internal fixator can be optimized based on the specific working environment requirements
  3. Both standard and non-standard models available – non-standard models designed and manufactured to customer requirements
  4. Complete sets available without gears, with external gears, with internal gears, or individual ring gears
  5. Secure packaging: metal bracket or export-standard fumigation-free wooden box

Common Applications of Four Point Contact Ball Slewing Bearings

Four point contact ball slewing bearings are widely used across various industries, particularly in construction machinery. Based on LDB’s application scope, common applications include:

Construction and heavy machinery:

  • Rotary conveyors
  • Welding robots and manipulators
  • Small and medium cranes
  • Excavators (turntable applications)
  • Aerial work platforms

Other industrial applications:

  • Solar tracking systems
  • Wind turbine yaw and pitch systems
  • Industrial turntables and indexing tables
  • Medical imaging equipment (CT scanners)
  • Material handling equipment
  • Radar and antenna rotators
  • Packaging machinery

The four point contact ball slewing bearing is especially suitable for applications that demand high axial load capacity, resistance to overturning moment, and continuous operation with extended service life. The single-row four-point contact ball slewing bearing is particularly well-suited for main engines with large axial load, high overturning moment, high service life requirements, and continuous operation.

How to Select the Right Four Point Contact Ball Slewing Bearing?

Selecting the correct four point contact ball slewing bearing for your application requires careful consideration of the following factors:

Selection FactorConsiderations
Load requirementsCalculate axial load, radial load, and tilting moment (kN·m). LDB’s rated load range is 129–3,410 kN.
Dimensional constraintsVerify outer diameter (300–10,000 mm), inner diameter (100–8,000 mm), and ball diameter (30–75 mm) fit your mounting space.
Gear configurationChoose no gear, internal gear, or external gear based on your drive system design.
Ring structureSelect integral ring for higher rigidity or split ring for easier adjustment.
Ball arrangementChoose caged design for standard applications with lower friction, or full-ball design for higher load capacity (note: full-ball design has higher friction and may cause scratches on steel ball surface).
Operating environmentConsider temperature, dust, moisture, and chemical exposure. LDB uses nitrile rubber seals as standard, with customization available for special environments.
Material and hardnessLDB offers 42CrMo and 50Mn materials with raceway quenching hardness HRC 55-62 for optimal wear resistance.
Precision requirementsSpecify required tolerances for your application.
Delivery scheduleLDB standard lead time is 10–30 days for custom orders.
WarrantyLDB offers 12 months warranty on all slewing bearings.

Additional selection tips:

  • For large axial loads and overturning moments with continuous operation, the single-row four-point contact ball slewing bearing is highly recommended
  • LDB can optimize sealing structure and internal fixator design based on your specific working environment
  • Both standard and non-standard models are available – contact LDB for non-standard requirements
  • Consider the total cost of ownership, including maintenance intervals and expected service life

LDB ：Custom Four Point Contact Ball Slewing Bearings Manufacturer

LDB (Luoyang Longda) is a professional enterprise specializing in the production and sales of slewing bearings (slewing rings), slewing drives, and gear transmission devices. As a reliable supplier of high-performance rotary components, LDB serves industries ranging from construction machinery to renewable energy.

LDB four point contact ball slewing bearing specifications:

ParameterLDB Range / Value
BrandLDB (Luoyang Longda)
Outer diameter300 mm – 10,000 mm
Inner diameter100 mm – 8,000 mm
Ball diameter30 mm – 75 mm
Rated load129 kN – 3,410 kN
Gear typeNo gear, internal gear, external gear
Delivery lead time10 – 30 days
Material42CrMo, 50Mn
Seal typeNitrile rubber
Rolling elementSteel ball
Normalizing hardness187 HB – 241 HB
Quenched and tempered hardness229 HB – 269 HB
Raceway quenching hardnessHRC 55 – 62
Warranty12 months
PackagingMetal bracket or export standard fumigation-free wooden box

LDB product advantages:

  1. Superior design: The single-row four-point contact ball slewing bearing is suitable for main engines requiring large axial load, high overturning moment, long service life, and continuous operation.
  2. Customizable engineering: According to the requirements of the supporting working environment, LDB can optimize the design of the sealing structure and the internal fixator.
  3. Flexible manufacturing: LDB maintains commonly used standard models, and non-standard models can be designed and manufactured according to customer requirements.
  4. Complete solutions: LDB provides complete sets of slewing bearings without gears, with external gears, with internal gears, or individual ring gears according to customer requirements.
  5. Secure packaging: All products are shipped in metal brackets or export-standard fumigation-free wooden boxes to ensure safe delivery.

Why choose LDB?

  • Experience: Years of expertise in slewing bearing design and manufacturing
  • Quality: High-grade materials (42CrMo, 50Mn) with precision heat treatment and raceway hardening to HRC 55-62
  • Customization: Full engineering support for non-standard models
  • Speed: 10-30 day delivery for custom orders
  • Warranty: 12 months on all products
  • Global shipping: Reliable logistics network supporting delivery worldwide

Whether you need a four point contact ball slewing bearing for an excavator turntable, a crane, a welding robot, a rotary conveyor, or any other rotary application, LDB delivers custom-engineered solutions with fast lead times and dependable quality.

Contact LDB today to discuss your specific four point contact ball slewing bearing requirements．

 Delivery of Caterpillar Excavator Slewing Ring to Europe

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In the field of construction machinery, the quality and timely delivery of slewing rings directly affect the stable operation of host equipment. In February 2025, our company successfully completed a supply task for a CAT excavator slewing ring to a client in Europe. This case demonstrates our supply chain capability and professional understanding of the Four-Point Contact Ball Slewing Bearing.

The slewing ring supplied in this project is of the four-point contact ball type. This bearing features a single raceway design where each ball contacts the raceway at four distinct points, allowing it to simultaneously withstand axial loads, radial loads, and tilting moments. Compared to other designs, the four-point contact ball bearing offers higher load efficiency, a compact cross-section, and good impact resistance, making it particularly suitable for excavators that require frequent slewing and heavy-duty operation.

The client in this case was based in Europe and explicitly requested a four-point contact ball slewing bearing for their CAT excavator. After order confirmation, our company strictly controlled every stage of production, inspection, and packaging. The slewing rings were shipped in February 2025 via a dedicated Europe logistics route. Each unit underwent dimensional accuracy, rotational flexibility, hardness, and flaw detection tests to confirm compliance with CAT standards. Anti-corrosion treatment and reinforced packaging were applied for long-distance transportation.

Upon arrival in Europe, the slewing rings were installed and tested. The customer reported excellent performance in actual excavator operations, including low friction, high rigidity, and stable rotational accuracy, effectively reducing slewing noise and vibration. This case once again proves our company’s professional capability in critical components for construction machinery, from product selection and quality control to international logistics.

What is a Four Point Contact Ball Slewing Bearing?

A four point contact ball slewing bearing is a precision rotary component primarily composed of an inner ring, an outer ring, a single row of steel balls, a cage (or spacer), and sealing devices. Both the inner and outer rings can be manufactured as either integral or split structures. Integral rings offer higher rigidity, while split rings allow for easier adjustment; for split structures, bolts are used to connect the two halves before the product leaves the factory.

This type of slewing bearing generally includes a cage or spacer to separate the balls. However, a full-ball (cageless) structure is used when load requirements are relatively high. The full-ball design provides larger load capacity but comes with higher frictional resistance, which can potentially cause scratches on the surface layer of the steel balls.

The basic structure is available in three gear configurations: without gear, with external gear, or with internal gear. All configurations offer high static load capacity. As a product of LDB (Luoyang Longda), this bearing type is manufactured using materials including 42CrMo and 50Mn, with nitrile rubber seals provided as standard.

How Does a Four Point Contact Ball Slewing Bearing Work?

The working principle is based on the Gothic arch raceway geometry.

Contact points:

  • Conventional bearings: ball contacts raceway at 2 points
  • Four point contact bearing: ball contacts raceway at 4 points (2 on inner ring, 2 on outer ring)

Load engagement:

  • Pure axial load in one direction → 2 of 4 contact points become active
  • Reversed axial load → opposite pair of contact points engages
  • Combined loads (axial + radial + tilting moment) → all 4 contact points share the load simultaneously

Key outcomes:

  • A single-row bearing performs functions that would otherwise require two separate rows
  • Consists of two seat rings (inner and outer)
  • Compact structure and light weight
  • Gothic arch raceway profile creates precise contact geometry for efficient load distribution

Key Features of Four Point Contact Ball Slewing Bearings

Design features:

  • Single-row compact design – only two seat rings, light weight
  • Four-point contact geometry – enables combined load handling (axial, radial, and tilting moment simultaneously)

Configuration options:

  • Gear options: no gear, internal gear, or external gear
  • Ring structure: integral (higher rigidity) or split (easier adjustment)
  • Ball arrangement: caged (standard) or full-ball (higher load capacity, higher friction)

Performance specifications:

  • High static load capacity
  • Outer diameter range: 300 mm – 10,000 mm
  • Ball diameter range: 30 mm – 75 mm
  • Rated load range: 129 kN – 3,410 kN
  • Fast delivery: 10–30 days for custom orders

LDB specific features:

  • Materials: 42CrMo and 50Mn
  • Seal type: Nitrile rubber
  • Hardness:
    • Normalizing: 187-241 HB
    • Quenched and tempered: 229-269 HB
    • Raceway quenching: HRC 55-62
  • Inner diameter range: 100 mm – 8,000 mm
  • Warranty: 12 months

Main Types of Four Point Contact Ball Slewing Bearings

1. By gear configuration:

  • No gear (plain) – for applications without gear engagement
  • Internal gear – teeth on inner ring, suitable for compact drive designs
  • External gear – teeth on outer ring, common in excavators, cranes, and turntables

2. By ring structure:

  • Integral ring design – higher rigidity, for heavy-duty applications
  • Split ring design – easier adjustment and maintenance; bolted together before shipment

3. By ball arrangement:

  • Caged design – standard, with spacers or cages to reduce friction and prevent ball-to-ball contact
  • Full-ball design – no cage or spacer; higher load capacity but increased friction and potential for scratches on steel ball surfaces

Core Advantages of Four Point Contact Ball Slewing Bearings

Performance advantages:

  • Combined load capability – bears axial, radial, and tilting moment forces in a single row
  • Bidirectional axial load support – no additional raceways required
  • High static load capacity – ideal for heavy shock loads and intermittent rotation

Design advantages:

  • Compact and lightweight – saves space, reduces overall machine weight
  • Design flexibility – customizable gear type, ring structure, and ball arrangement
  • Cost-effective – lower manufacturing and maintenance costs than double-row or cross-roller alternatives

Operational advantages:

  • Long service life – optimized sealing and lubrication for harsh environments
  • Fast customization – 10–30 day delivery for custom orders

LDB product advantages:

  • Suitable for main engines requiring large axial load, high overturning moment, long service life, and continuous operation
  • Sealing structure and internal fixator can be optimized based on working environment
  • Both standard and non-standard models available
  • Complete sets available (without gears, with external gears, with internal gears, or individual ring gears)
  • Secure packaging: metal bracket or export-standard fumigation-free wooden box

Common Applications of Four Point Contact Ball Slewing Bearings

Construction and heavy machinery:

  • Rotary conveyors
  • Welding robots and manipulators
  • Small and medium cranes
  • Excavators (turntable applications)
  • Aerial work platforms

Other industrial applications:

  • Solar tracking systems
  • Wind turbine yaw and pitch systems
  • Industrial turntables and indexing tables
  • Medical imaging equipment (CT scanners)
  • Material handling equipment
  • Radar and antenna rotators
  • Packaging machinery

Best suited for:

  • Applications demanding high axial load capacity
  • Resistance to overturning moment
  • Continuous operation with extended service life

How to Select the Right Four Point Contact Ball Slewing Bearing?

Key selection factors:

FactorConsiderations
Load requirementsAxial, radial, and tilting moment (kN·m); LDB range: 129–3,410 kN
Dimensional constraintsOuter diameter (300–10,000 mm), inner diameter (100–8,000 mm), ball diameter (30–75 mm)
Gear configurationNo gear, internal gear, or external gear based on drive system
Ring structureIntegral (higher rigidity) or split (easier adjustment)
Ball arrangementCaged (lower friction) or full-ball (higher load capacity, but higher friction and scratch risk)
Operating environmentTemperature, dust, moisture, chemicals; LDB uses nitrile rubber seals (customization available)
Material and hardness42CrMo and 50Mn; raceway quenching hardness HRC 55-62
Precision requirementsSpecify required tolerances
Delivery scheduleLDB standard: 10–30 days for custom orders
WarrantyLDB offers 12 months

Additional selection tips:

  • For large axial loads and overturning moments with continuous operation → single-row four-point contact ball slewing bearing is highly recommended
  • LDB can optimize sealing structure and internal fixator design based on your working environment
  • Non-standard models available upon request
  • Consider total cost of ownership (maintenance intervals + expected service life)

LDB ：Custom Four Point Contact Ball Slewing Bearings Manufacturer

Company profile:
LDB (Luoyang Longda) is a professional enterprise specializing in the production and sales of slewing bearings (slewing rings), slewing drives, and gear transmission devices, serving industries from construction machinery to renewable energy.

Product specifications:

ParameterLDB Range / Value
BrandLDB (Luoyang Longda)
Outer diameter300 mm – 10,000 mm
Inner diameter100 mm – 8,000 mm
Ball diameter30 mm – 75 mm
Rated load129 kN – 3,410 kN
Gear typeNo gear, internal gear, external gear
Delivery lead time10 – 30 days
Material42CrMo, 50Mn
Seal typeNitrile rubber
Rolling elementSteel ball
Normalizing hardness187 HB – 241 HB
Quenched and tempered hardness229 HB – 269 HB
Raceway quenching hardnessHRC 55 – 62
Warranty12 months
PackagingMetal bracket or export-standard fumigation-free wooden box

LDB product advantages:

  • Suitable for main engines requiring large axial load, high overturning moment, long service life, and continuous operation
  • Customizable sealing structure and internal fixator based on working environment
  • Standard and non-standard models available
  • Complete solutions (without gears, with external gears, with internal gears, or individual ring gears)
  • Secure packaging for safe delivery

Why choose LDB?

  • Experience: Years of expertise in slewing bearing design and manufacturing
  • Quality: High-grade materials (42CrMo, 50Mn) with precision heat treatment and raceway hardening to HRC 55-62
  • Customization: Full engineering support for non-standard models
  • Speed: 10-30 day delivery for custom orders
  • Warranty: 12 months on all products
  • Global shipping: Reliable logistics network worldwide

Contact:
Whether you need a four point contact ball slewing bearing for an excavator turntable, crane, welding robot, rotary conveyor, or any other rotary application, LDB delivers custom-engineered solutions with fast lead times and dependable quality. Contact LDB today to discuss your specific requirements.

CAT Excavator Slewing Bearing Supplied to South America

/in /by

In the field of construction machinery, the quality and timely delivery of slewing rings directly affect the stable operation of host equipment. In November 2021, our company successfully completed a supply task for a CAT excavator slewing ring to a client in South America. This case not only demonstrates our mature capability in supply chain management but also highlights our professional understanding of a specific bearing type: the Four-Point Contact Ball Slewing Bearing.

The slewing ring supplied in this project is of the four-point contact ball type. This bearing features a single raceway design, where each ball contacts the raceway at four distinct points. As a result, it can simultaneously withstand axial loads, radial loads, and tilting moments. Compared to other slewing bearing types, the four-point contact ball design offers higher load efficiency, a more compact cross-section, and good impact resistance. These characteristics make it particularly suitable for excavators and other construction machinery that require frequent slewing and heavy-duty operation.

Caterpillar (CAT), as a globally renowned construction machinery brand, imposes strict requirements on the precision, reliability, and service life of the slewing rings used in its excavators. The client in this case was based in South America, and the equipment was intended for applications such as mining, earthmoving, and infrastructure construction. To ensure stable slewing performance and operational safety under complex combined loads, the client explicitly requested a four-point contact ball slewing bearing.

After order confirmation, our company strictly controlled every stage of production, inspection, and packaging. The slewing rings were manufactured as scheduled and shipped in November 2021 via a dedicated South America logistics route. Each unit underwent a full range of factory tests, including dimensional accuracy, rotational flexibility, hardness, and flaw detection, to confirm compliance with CAT excavator interface and performance standards. For logistics, anti-corrosion treatment and reinforced packaging were applied to prevent damage or rust during long-distance ocean transportation.

Upon arrival at the client’s site in South America, the slewing rings were installed and tested. The customer reported that the four-point contact ball slewing bearing performed excellently in actual excavator operations, demonstrating low friction, high rigidity, and stable rotational accuracy. It effectively reduced slewing noise and vibration, meeting the expected service life requirements under demanding working conditions.

This case of supplying a Four-Point Contact Ball Slewing Bearing for a CAT excavator to a South American client in November 2021 once again proves our company’s professional capability in the field of critical components for construction machinery. From product selection and quality control to international logistics, we are committed to providing efficient and reliable solutions for our customers. We look forward to continuing to support the stable operation of construction equipment worldwide with high-quality slewing rings.

What is a Four Point Contact Ball Slewing Bearing?

A four point contact ball slewing bearing is a precision rotary component primarily composed of an inner ring, an outer ring, a single row of steel balls, a cage (or spacer), and sealing devices. Both the inner and outer rings can be manufactured as either integral or split structures. Integral rings offer higher rigidity, while split rings allow for easier adjustment. For split structures, bolts are used to connect the two split rings before the product leaves the factory.

This type of slewing bearing generally includes a cage or spacer to separate the balls. However, a full-ball (no cage) structure is used when load requirements are relatively high. The full-ball design provides larger load capacity but comes with higher frictional resistance, which can potentially cause scratches on the surface layer of the steel balls.

The basic structure of a four point contact ball slewing bearing is available in three gear configurations: without gear, with external gear, or with internal gear. All configurations offer high static load capacity. As a product of LDB (Luoyang Longda), this bearing type is manufactured with materials including 42CrMo and 50Mn, with nitrile rubber seals as standard.

How Does a Four Point Contact Ball Slewing Bearing Work?

The working principle of a four point contact ball slewing bearing is based on its unique Gothic arch raceway geometry. Unlike conventional ball bearings where the ball contacts the raceway at two points, this design allows each steel ball to make contact at four points – two on the inner ring and two on the outer ring.

When loads are applied, the contact points engage as follows:

  • Pure axial load in one direction: Two of the four contact points become active
  • Reversed axial load: The opposite pair of contact points engages
  • Combined loads (axial + radial + tilting moment): All four contact points share the load simultaneously

This load distribution mechanism enables a single-row bearing to perform functions that would otherwise require two separate rows. The single-row four-point contact ball slewing bearing consists of two seat rings, offering a compact structure and light weight. The four-point contact between the steel ball and the arc raceway allows the bearing to bear axial force, radial force, and tilting moment at the same time. This is achieved because the Gothic arch raceway profile creates a precise contact geometry that distributes loads efficiently across the bearing.

Key Features of Four Point Contact Ball Slewing Bearings

The four point contact ball slewing bearing offers a range of distinctive engineering features:

  • Single-row compact design: Consists of only two seat rings (inner and outer), providing a compact structure with light weight
  • Four-point contact geometry: Steel balls contact the arc raceway at four points, enabling combined load handling (axial, radial, and tilting moment simultaneously)
  • Multiple gear options: Available as no gear, internal gear, or external gear to suit various drive configurations
  • Flexible ring structure: Choice between integral rings (higher rigidity) and split rings (easier adjustment)
  • Cage or full-ball options: Caged designs for standard applications; full-ball designs for higher load capacity with the trade-off of increased friction
  • High static load capacity: Engineered to withstand demanding static and dynamic conditions
  • Wide dimensional range: Outer diameter from 300 mm to 10,000 mm, ball diameter from 30 mm to 75 mm
  • High load rating: Rated load from 129 kN to 3,410 kN
  • Fast delivery: Standard lead time of 10–30 days for custom orders

LDB specific features:

  • Materials: 42CrMo and 50Mn high-grade steel
  • Seal type: Nitrile rubber for effective contamination protection
  • Hardness: Normalizing hardness 187-241 HB, quenched and tempered hardness 229-269 HB, raceway quenching hardness HRC 55-62
  • Inner diameter range: 100 mm to 8,000 mm
  • Warranty: 12 months

Main Types of Four Point Contact Ball Slewing Bearings

Four point contact ball slewing bearings can be classified based on three main criteria: gear configuration, ring structure, and ball arrangement.

1. By gear configuration:

  • No gear (plain): For applications where the drive system does not require gear engagement
  • Internal gear: Gear teeth cut on the inner ring, suitable for compact drive designs where space is limited
  • External gear: Gear teeth cut on the outer ring, commonly used in excavators, cranes, and turntables

2. By ring structure:

  • Integral ring design: Higher rigidity, suitable for heavy-duty applications requiring maximum structural integrity
  • Split ring design: Allows for easier adjustment and maintenance; bolts connect the two split rings before the product leaves the factory

3. By ball arrangement:

  • Caged design: Standard configuration with spacers or cages to reduce friction and prevent ball-to-ball contact
  • Full-ball design: No cage or spacer, providing higher load capacity but increased frictional resistance; friction can also easily cause scratches on the surface layer of the steel ball

Core Advantages of Four Point Contact Ball Slewing Bearings

The four point contact ball slewing bearing offers several distinct advantages over other slewing bearing types:

  • Combined load capability: Can simultaneously bear axial force, radial force, and tilting moment within a single row, eliminating the need for multiple bearing arrangements
  • Compact and lightweight: The single-row two-seat-ring design saves space and reduces overall machine weight, making it ideal for mobile equipment
  • Bidirectional axial load support: Handles thrust loads from both directions without additional raceways or bearings
  • High static load capacity: Suitable for applications with heavy shock loads and intermittent rotation patterns common in construction machinery
  • Design flexibility: Customizable gear type (no gear, internal gear, external gear), ring structure (integral or split), and ball arrangement (caged or full-ball) to meet specific requirements
  • Long service life: Optimized sealing and lubrication options extend operational life, especially in harsh environments
  • Cost-effective: Lower manufacturing and maintenance costs compared to double-row or cross-roller alternatives
  • Fast customization: 10–30 day delivery for custom orders enables rapid project execution

LDB product advantages:

  1. This series of slewing ring is suitable for main engines requiring large axial load, high overturning moment, long service life, and continuous operation
  2. Sealing structure and internal fixator can be optimized based on the specific working environment requirements
  3. Both standard and non-standard models available – non-standard models designed and manufactured to customer requirements
  4. Complete sets available without gears, with external gears, with internal gears, or individual ring gears
  5. Secure packaging: metal bracket or export-standard fumigation-free wooden box

Common Applications of Four Point Contact Ball Slewing Bearings

Four point contact ball slewing bearings are widely used across various industries, particularly in construction machinery. Based on LDB’s application scope, common applications include:

Construction and heavy machinery:

  • Rotary conveyors
  • Welding robots and manipulators
  • Small and medium cranes
  • Excavators (turntable applications)
  • Aerial work platforms

Other industrial applications:

  • Solar tracking systems
  • Wind turbine yaw and pitch systems
  • Industrial turntables and indexing tables
  • Medical imaging equipment (CT scanners)
  • Material handling equipment
  • Radar and antenna rotators
  • Packaging machinery

The four point contact ball slewing bearing is especially suitable for applications that demand high axial load capacity, resistance to overturning moment, and continuous operation with extended service life. The single-row four-point contact ball slewing bearing is particularly well-suited for main engines with large axial load, high overturning moment, high service life requirements, and continuous operation.

How to Select the Right Four Point Contact Ball Slewing Bearing?

Selecting the correct four point contact ball slewing bearing for your application requires careful consideration of the following factors:

Selection FactorConsiderations
Load requirementsCalculate axial load, radial load, and tilting moment (kN·m). LDB’s rated load range is 129–3,410 kN.
Dimensional constraintsVerify outer diameter (300–10,000 mm), inner diameter (100–8,000 mm), and ball diameter (30–75 mm) fit your mounting space.
Gear configurationChoose no gear, internal gear, or external gear based on your drive system design.
Ring structureSelect integral ring for higher rigidity or split ring for easier adjustment.
Ball arrangementChoose caged design for standard applications with lower friction, or full-ball design for higher load capacity (note: full-ball design has higher friction and may cause scratches on steel ball surface).
Operating environmentConsider temperature, dust, moisture, and chemical exposure. LDB uses nitrile rubber seals as standard, with customization available for special environments.
Material and hardnessLDB offers 42CrMo and 50Mn materials with raceway quenching hardness HRC 55-62 for optimal wear resistance.
Precision requirementsSpecify required tolerances for your application.
Delivery scheduleLDB standard lead time is 10–30 days for custom orders.
WarrantyLDB offers 12 months warranty on all slewing bearings.

Additional selection tips:

  • For large axial loads and overturning moments with continuous operation, the single-row four-point contact ball slewing bearing is highly recommended
  • LDB can optimize sealing structure and internal fixator design based on your specific working environment
  • Both standard and non-standard models are available – contact LDB for non-standard requirements
  • Consider the total cost of ownership, including maintenance intervals and expected service life

LDB – Custom Four Point Contact Ball Slewing Bearings Manufacturer

LDB (Luoyang Longda) is a professional enterprise specializing in the production and sales of slewing bearings (slewing rings), slewing drives, and gear transmission devices. As a reliable supplier of high-performance rotary components, LDB serves industries ranging from construction machinery to renewable energy.

LDB four point contact ball slewing bearing specifications:

ParameterLDB Range / Value
BrandLDB (Luoyang Longda)
Outer diameter300 mm – 10,000 mm
Inner diameter100 mm – 8,000 mm
Ball diameter30 mm – 75 mm
Rated load129 kN – 3,410 kN
Gear typeNo gear, internal gear, external gear
Delivery lead time10 – 30 days
Material42CrMo, 50Mn
Seal typeNitrile rubber
Rolling elementSteel ball
Normalizing hardness187 HB – 241 HB
Quenched and tempered hardness229 HB – 269 HB
Raceway quenching hardnessHRC 55 – 62
Warranty12 months
PackagingMetal bracket or export standard fumigation-free wooden box

LDB product advantages:

  1. Superior design: The single-row four-point contact ball slewing bearing is suitable for main engines requiring large axial load, high overturning moment, long service life, and continuous operation.
  2. Customizable engineering: According to the requirements of the supporting working environment, LDB can optimize the design of the sealing structure and the internal fixator.
  3. Flexible manufacturing: LDB maintains commonly used standard models, and non-standard models can be designed and manufactured according to customer requirements.
  4. Complete solutions: LDB provides complete sets of slewing bearings without gears, with external gears, with internal gears, or individual ring gears according to customer requirements.
  5. Secure packaging: All products are shipped in metal brackets or export-standard fumigation-free wooden boxes to ensure safe delivery.

Why choose LDB?

  • Experience: Years of expertise in slewing bearing design and manufacturing
  • Quality: High-grade materials (42CrMo, 50Mn) with precision heat treatment and raceway hardening to HRC 55-62
  • Customization: Full engineering support for non-standard models
  • Speed: 10-30 day delivery for custom orders
  • Warranty: 12 months on all products
  • Global shipping: Reliable logistics network supporting delivery worldwide

Whether you need a four point contact ball slewing bearing for an excavator turntable, a crane, a welding robot, a rotary conveyor, or any other rotary application, LDB delivers custom-engineered solutions with fast lead times and dependable quality.

Contact LDB today to discuss your specific four point contact ball slewing bearing requirements．


XCMG Excavator Slewing Ring Supplied to Asia

/in /by

In the field of construction machinery, the quality and timely delivery of slewing rings directly affect the stable operation of host equipment. In March 2023, our company successfully completed a supply task for an XCMG excavator slewing ring to a client in Asia. This case not only demonstrates our mature capability in supply chain management but also highlights our professional understanding of a specific bearing type: the Four-Point Contact Ball Slewing Bearing.

The slewing ring supplied in this project is of the four-point contact ball type. This bearing features a single raceway design, where each ball contacts the raceway at four distinct points. As a result, it can simultaneously withstand axial loads, radial loads, and tilting moments. Compared to other slewing bearing types, the four-point contact ball design offers higher load efficiency, a more compact cross-section, and good impact resistance. These characteristics make it particularly suitable for excavators and other construction machinery that require frequent slewing and heavy-duty operation.

XCMG, as a leading Chinese construction machinery brand, imposes strict requirements on the precision, reliability, and service life of the slewing rings used in its excavators. The client in this case was based in Asia, and the equipment was intended for applications such as earthmoving, mining, and infrastructure construction. To ensure stable slewing performance and operational safety under complex combined loads, the client explicitly requested a four-point contact ball slewing bearing.

After order confirmation, our company strictly controlled every stage of production, inspection, and packaging. The slewing rings were manufactured as scheduled and shipped in March 2023 via a dedicated Asia logistics route. Each unit underwent a full range of factory tests, including dimensional accuracy, rotational flexibility, hardness, and flaw detection, to confirm compliance with XCMG excavator interface and performance standards. For logistics, anti-corrosion treatment and reinforced packaging were applied to prevent damage or rust during long-distance transportation.

Upon arrival at the client’s site in Asia, the slewing rings were installed and tested. The customer reported that the four-point contact ball slewing bearing performed excellently in actual excavator operations, demonstrating low friction, high rigidity, and stable rotational accuracy. It effectively reduced slewing noise and vibration, meeting the expected service life requirements.

This case of supplying a Four-Point Contact Ball Slewing Bearing for an XCMG excavator to an Asian client in March 2023 once again proves our company’s professional capability in the field of critical components for construction machinery. From product selection and quality control to international logistics, we are committed to providing efficient and reliable solutions for our customers. We look forward to continuing to support the stable operation of construction equipment worldwide with high-quality slewing rings.

What is a Four Point Contact Ball Slewing Bearing?

A four point contact ball slewing bearing is a precision rotary component primarily composed of an inner ring, an outer ring, a single row of steel balls, a cage (or spacer), and sealing devices. Both the inner and outer rings can be manufactured as either integral or split structures. Integral rings offer higher rigidity, while split rings allow for easier adjustment. For split structures, bolts are used to connect the two split rings before the product leaves the factory.

This type of slewing bearing generally includes a cage or spacer to separate the balls. However, a full-ball (no cage) structure is used when load requirements are relatively high. The full-ball design provides larger load capacity but comes with higher frictional resistance, which can potentially cause scratches on the surface layer of the steel balls.

The basic structure of a four point contact ball slewing bearing is available in three gear configurations: without gear, with external gear, or with internal gear. All configurations offer high static load capacity. As a product of LDB (Luoyang Longda), this bearing type is manufactured with materials including 42CrMo and 50Mn, with nitrile rubber seals as standard.

How Does a Four Point Contact Ball Slewing Bearing Work?

The working principle of a four point contact ball slewing bearing is based on its unique Gothic arch raceway geometry. Unlike conventional ball bearings where the ball contacts the raceway at two points, this design allows each steel ball to make contact at four points – two on the inner ring and two on the outer ring.

When loads are applied, the contact points engage as follows:

  • Pure axial load in one direction: Two of the four contact points become active
  • Reversed axial load: The opposite pair of contact points engages
  • Combined loads (axial + radial + tilting moment): All four contact points share the load simultaneously

This load distribution mechanism enables a single-row bearing to perform functions that would otherwise require two separate rows. The single-row four-point contact ball slewing bearing consists of two seat rings, offering a compact structure and light weight. The four-point contact between the steel ball and the arc raceway allows the bearing to bear axial force, radial force, and tilting moment at the same time. This is achieved because the Gothic arch raceway profile creates a precise contact geometry that distributes loads efficiently across the bearing.

Key Features of Four Point Contact Ball Slewing Bearings

The four point contact ball slewing bearing offers a range of distinctive engineering features:

  • Single-row compact design: Consists of only two seat rings (inner and outer), providing a compact structure with light weight
  • Four-point contact geometry: Steel balls contact the arc raceway at four points, enabling combined load handling (axial, radial, and tilting moment simultaneously)
  • Multiple gear options: Available as no gear, internal gear, or external gear to suit various drive configurations
  • Flexible ring structure: Choice between integral rings (higher rigidity) and split rings (easier adjustment)
  • Cage or full-ball options: Caged designs for standard applications; full-ball designs for higher load capacity with the trade-off of increased friction
  • High static load capacity: Engineered to withstand demanding static and dynamic conditions
  • Wide dimensional range: Outer diameter from 300 mm to 10,000 mm, ball diameter from 30 mm to 75 mm
  • High load rating: Rated load from 129 kN to 3,410 kN
  • Fast delivery: Standard lead time of 10–30 days for custom orders

LDB specific features:

  • Materials: 42CrMo and 50Mn high-grade steel
  • Seal type: Nitrile rubber for effective contamination protection
  • Hardness: Normalizing hardness 187-241 HB, quenched and tempered hardness 229-269 HB, raceway quenching hardness HRC 55-62
  • Inner diameter range: 100 mm to 8,000 mm
  • Warranty: 12 months

Main Types of Four Point Contact Ball Slewing Bearings

Four point contact ball slewing bearings can be classified based on three main criteria: gear configuration, ring structure, and ball arrangement.

1. By gear configuration:

  • No gear (plain): For applications where the drive system does not require gear engagement
  • Internal gear: Gear teeth cut on the inner ring, suitable for compact drive designs where space is limited
  • External gear: Gear teeth cut on the outer ring, commonly used in excavators, cranes, and turntables

2. By ring structure:

  • Integral ring design: Higher rigidity, suitable for heavy-duty applications requiring maximum structural integrity
  • Split ring design: Allows for easier adjustment and maintenance; bolts connect the two split rings before the product leaves the factory

3. By ball arrangement:

  • Caged design: Standard configuration with spacers or cages to reduce friction and prevent ball-to-ball contact
  • Full-ball design: No cage or spacer, providing higher load capacity but increased frictional resistance; friction can also easily cause scratches on the surface layer of the steel ball

Core Advantages of Four Point Contact Ball Slewing Bearings

The four point contact ball slewing bearing offers several distinct advantages over other slewing bearing types:

  • Combined load capability: Can simultaneously bear axial force, radial force, and tilting moment within a single row, eliminating the need for multiple bearing arrangements
  • Compact and lightweight: The single-row two-seat-ring design saves space and reduces overall machine weight, making it ideal for mobile equipment
  • Bidirectional axial load support: Handles thrust loads from both directions without additional raceways or bearings
  • High static load capacity: Suitable for applications with heavy shock loads and intermittent rotation patterns common in construction machinery
  • Design flexibility: Customizable gear type (no gear, internal gear, external gear), ring structure (integral or split), and ball arrangement (caged or full-ball) to meet specific requirements
  • Long service life: Optimized sealing and lubrication options extend operational life, especially in harsh environments
  • Cost-effective: Lower manufacturing and maintenance costs compared to double-row or cross-roller alternatives
  • Fast customization: 10–30 day delivery for custom orders enables rapid project execution

LDB product advantages:

  1. This series of slewing ring is suitable for main engines requiring large axial load, high overturning moment, long service life, and continuous operation
  2. Sealing structure and internal fixator can be optimized based on the specific working environment requirements
  3. Both standard and non-standard models available – non-standard models designed and manufactured to customer requirements
  4. Complete sets available without gears, with external gears, with internal gears, or individual ring gears
  5. Secure packaging: metal bracket or export-standard fumigation-free wooden box

Common Applications of Four Point Contact Ball Slewing Bearings

Four point contact ball slewing bearings are widely used across various industries, particularly in construction machinery. Based on LDB’s application scope, common applications include:

Construction and heavy machinery:

  • Rotary conveyors
  • Welding robots and manipulators
  • Small and medium cranes
  • Excavators (turntable applications)
  • Aerial work platforms

Other industrial applications:

  • Solar tracking systems
  • Wind turbine yaw and pitch systems
  • Industrial turntables and indexing tables
  • Medical imaging equipment (CT scanners)
  • Material handling equipment
  • Radar and antenna rotators
  • Packaging machinery

The four point contact ball slewing bearing is especially suitable for applications that demand high axial load capacity, resistance to overturning moment, and continuous operation with extended service life. The single-row four-point contact ball slewing bearing is particularly well-suited for main engines with large axial load, high overturning moment, high service life requirements, and continuous operation.

How to Select the Right Four Point Contact Ball Slewing Bearing?

Selecting the correct four point contact ball slewing bearing for your application requires careful consideration of the following factors:

Selection FactorConsiderations
Load requirementsCalculate axial load, radial load, and tilting moment (kN·m). LDB’s rated load range is 129–3,410 kN.
Dimensional constraintsVerify outer diameter (300–10,000 mm), inner diameter (100–8,000 mm), and ball diameter (30–75 mm) fit your mounting space.
Gear configurationChoose no gear, internal gear, or external gear based on your drive system design.
Ring structureSelect integral ring for higher rigidity or split ring for easier adjustment.
Ball arrangementChoose caged design for standard applications with lower friction, or full-ball design for higher load capacity (note: full-ball design has higher friction and may cause scratches on steel ball surface).
Operating environmentConsider temperature, dust, moisture, and chemical exposure. LDB uses nitrile rubber seals as standard, with customization available for special environments.
Material and hardnessLDB offers 42CrMo and 50Mn materials with raceway quenching hardness HRC 55-62 for optimal wear resistance.
Precision requirementsSpecify required tolerances for your application.
Delivery scheduleLDB standard lead time is 10–30 days for custom orders.
WarrantyLDB offers 12 months warranty on all slewing bearings.

Additional selection tips:

  • For large axial loads and overturning moments with continuous operation, the single-row four-point contact ball slewing bearing is highly recommended
  • LDB can optimize sealing structure and internal fixator design based on your specific working environment
  • Both standard and non-standard models are available – contact LDB for non-standard requirements
  • Consider the total cost of ownership, including maintenance intervals and expected service life

LDB – Custom Four Point Contact Ball Slewing Bearings Manufacturer

LDB (Luoyang Longda) is a professional enterprise specializing in the production and sales of slewing bearings (slewing rings), slewing drives, and gear transmission devices. As a reliable supplier of high-performance rotary components, LDB serves industries ranging from construction machinery to renewable energy.

LDB four point contact ball slewing bearing specifications:

ParameterLDB Range / Value
BrandLDB (Luoyang Longda)
Outer diameter300 mm – 10,000 mm
Inner diameter100 mm – 8,000 mm
Ball diameter30 mm – 75 mm
Rated load129 kN – 3,410 kN
Gear typeNo gear, internal gear, external gear
Delivery lead time10 – 30 days
Material42CrMo, 50Mn
Seal typeNitrile rubber
Rolling elementSteel ball
Normalizing hardness187 HB – 241 HB
Quenched and tempered hardness229 HB – 269 HB
Raceway quenching hardnessHRC 55 – 62
Warranty12 months
PackagingMetal bracket or export standard fumigation-free wooden box

LDB product advantages:

  1. Superior design: The single-row four-point contact ball slewing bearing is suitable for main engines requiring large axial load, high overturning moment, long service life, and continuous operation.
  2. Customizable engineering: According to the requirements of the supporting working environment, LDB can optimize the design of the sealing structure and the internal fixator.
  3. Flexible manufacturing: LDB maintains commonly used standard models, and non-standard models can be designed and manufactured according to customer requirements.
  4. Complete solutions: LDB provides complete sets of slewing bearings without gears, with external gears, with internal gears, or individual ring gears according to customer requirements.
  5. Secure packaging: All products are shipped in metal brackets or export-standard fumigation-free wooden boxes to ensure safe delivery.

Why choose LDB?

  • Experience: Years of expertise in slewing bearing design and manufacturing
  • Quality: High-grade materials (42CrMo, 50Mn) with precision heat treatment and raceway hardening to HRC 55-62
  • Customization: Full engineering support for non-standard models
  • Speed: 10-30 day delivery for custom orders
  • Warranty: 12 months on all products
  • Global shipping: Reliable logistics network supporting delivery worldwide

Whether you need a four point contact ball slewing bearing for an excavator turntable, a crane, a welding robot, a rotary conveyor, or any other rotary application, LDB delivers custom-engineered solutions with fast lead times and dependable quality.

Contact LDB today to discuss your specific four point contact ball slewing bearing requirements．