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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.

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 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.