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Precision Meets Performance: A Deep Dive into Four Point Contact Ball Slewing Bearings

What is a Four Point Contact Ball Slewing Bearing?

A Four Point Contact Ball Slewing Bearing is a type of rotational rolling-element bearing that allows one row of balls to contact the raceway at four points. This unique geometry enables the bearing to carry axial loads in both directions, radial loads, and tilting moments—simultaneously. Because of its compact structure and ability to handle complex combined loads, this bearing is widely used in applications that demand high reliability, space efficiency, and operational precision.

The Engineering Behind Four Point Contact Bearings

At the heart of a four-point contact slewing bearing lies its cross-section geometry. The inner and outer rings are typically split into two halves, and the raceways are designed to enable contact at four distinct points. The contact angle is generally 35°, which allows the balls to bear force both axially and radially.

The internal clearance is carefully optimized during design to accommodate misalignment and thermal expansion, while maintaining high rotational accuracy. LDB Bearing uses advanced CNC machining and induction hardening processes to produce precision-ground raceways, which significantly extend the bearing’s service life under dynamic load conditions.

Key Structural Advantages

Simplified design: One bearing does the job of two.

Weight saving: Reduces overall system mass, especially in rotating equipment.

Fewer parts: Lowers assembly complexity and maintenance costs.

High stiffness: Offers excellent support under eccentric or offset loads.

Typical Applications of Four Point Contact Ball Slewing Bearings

This bearing style is a favorite in industries where multifunctional load handling and space constraints are critical. Below are some representative application domains where LDB’s four-point bearings perform exceptionally well:

Construction Machinery

Crawler cranes, truck-mounted cranes, and excavators all depend on four point contact bearings to support boom rotation and lifting. These bearings must support significant radial loads from the rotating superstructure and moment loads due to heavy lifting. LDB supplies high-load-capacity models to construction OEMs worldwide.

Wind Energy

Yaw bearings in wind turbines allow the nacelle to rotate and face the wind. These bearings endure frequent wind direction changes and high axial loads. LDB offers anti-corrosion treated models and customized seal configurations for offshore and onshore applications.

Medical Imaging Equipment

In large diagnostic machines like CT scanners and radiotherapy devices, bearings must deliver smooth, quiet, and stable rotation. LDB produces precision-ground models with ultra-low noise and minimal backlash to meet the strict requirements of the medical field.

Industrial Turntables and Robots

Rotary tables and robotic joints benefit from the compact design and precision of four-point contact bearings. LDB’s product range supports automated welding stations, assembly arms, and semiconductor inspection equipment.

Aerial Platforms and Lifts

Stability and safety are paramount in elevating work platforms. LDB bearings ensure safe load support and smooth motion across varying elevation and rotation conditions.

LDB’s Four Point Contact Slewing Bearing Portfolio

LDB Bearing, headquartered in Luoyang, China, is a globally recognized manufacturer specializing in slewing rings and drive solutions. Their four point contact ball slewing bearings are manufactured under ISO 9001 and ISO/TS 16949-certified quality systems.

Product Features:

Materials: Forged 42CrMo or 50Mn rings with GCr15 steel balls.

Hardness: Raceway hardness 55–62 HRC for long wear life.

Raceway Design: Precision-ground for uniform ball contact.

Customization: Inner ring, outer ring, or gearless options available.

Diameter Range: 300 mm to 10,000 mm to fit light to heavy machinery.

LDB also offers tailored solutions with specific bolt patterns, grease nipples, sealing systems, and pre-load settings based on customer drawings or industry standards.

Pricing Overview

Pricing for four point contact ball slewing bearings depends on a range of factors including:

Bearing size and gear type (external/internal/no gear)

Material grade and surface treatment

Load rating and dynamic requirements

Custom features (seals, mounting holes, lubrication)

As a rough estimate, small- to mid-sized models (300–1000 mm OD) range from $300 to $1200 USD per unit, while large-scale models (2000+ mm OD) can cost upwards of $5000 USD. LDB offers volume discounts for OEM clients and long-term project partnerships.

To obtain accurate pricing, customers can submit inquiries through LDB’s official website or consult directly with a sales engineer for a personalized quote.

Why Choose LDB?

LDB Bearing has over 20 years of manufacturing experience in large-diameter bearing production. Here’s why global clients choose LDB as their go-to slewing bearing supplier:

Advanced Production Capabilities

Over 300 CNC machining centers

Induction hardening, gear shaping, and ultrasonic testing

Integrated QC processes with 100% inspection before delivery

Technical Support & Engineering

2D/3D CAD support for design validation

Finite element analysis (FEA) to ensure load safety

Application-specific customization (robotics, energy, medical, etc.)

Worldwide Distribution

LDB’s products are exported to over 40 countries and regions including Europe, Southeast Asia, North America, and the Middle East. The company supports global clients with bilingual technical documentation and 24/7 after-sales service.

Conclusion

Whether you’re designing a crane, building a wind turbine, or innovating in automation, the four point contact ball slewing bearing is an engineering solution that combines strength, compactness, and reliability. Backed by precision manufacturing and deep application knowledge, LDB Bearing delivers world-class solutions that meet and exceed industry standards.

For a future-proof investment in bearing performance, choose LDB—where quality meets innovation.

How to Choose the Right Slewing Bearing for Heavy-Duty Equipment

What Is a Slewing Bearing?

A slewing bearing, also known as a slewing ring or turntable bearing, is a specialized bearing that allows rotational movement between two components, typically supporting axial, radial, and moment loads simultaneously. These bearings are essential in heavy-duty machinery where large-scale, slow-speed rotational motion is required—such as in excavators, cranes, wind turbines, and offshore platforms.

Slewing bearings are designed to handle complex mechanical demands while operating reliably under harsh environmental conditions. They are available in various configurations depending on the load, motion requirements, and application.

Key Types of Slewing Bearings and Their Applications

Understanding the differences between slewing bearing types is crucial in selecting the right model. The most common options include:

Four Point Contact Ball Slewing Bearing

Structure: Single row, four-point contact ball design

Applications: Cranes, excavators, rotating platforms

Benefits: Supports axial and moment loads in both directions with compact design

Double Row Ball Slewing Bearing

Structure: Two rows of balls for increased load capacity

Applications: Tower cranes, construction equipment

Benefits: Enhanced axial and radial load support

Three-Row Roller Slewing Bearing

Structure: Three separate raceways for radial, axial, and moment load separation

Applications: Offshore cranes, tunnel boring machines, wind turbines

Benefits: Extremely high load capacity and stability

Cross Roller Slewing Bearing

Structure: Cylindrical rollers arranged in a crossed pattern

Applications: Robotics, precision rotating platforms

Benefits: High precision and rigidity with minimal clearance

Flanged Slewing Bearing

Structure: Built-in flange on inner or outer ring

Applications: Compact equipment, robotics, solar trackers

Benefits: Easy installation and alignment, space-saving

Factors to Consider When Selecting a Slewing Bearing

Choosing the right slewing bearing depends on several performance and application parameters:

Load Characteristics

Determine the magnitude and direction of axial, radial, and moment loads.

Three-row roller bearings are best for extreme loads; four-point contact bearings suit moderate applications.

Rotational Speed and Precision

High-precision systems like robotics may require cross roller bearings with minimal backlash.

For slow and intermittent rotation, double-row or four-point contact bearings suffice.

Installation Space

Flanged bearings are ideal for tight spaces due to their integrated mounting features.

Select compact designs for mobile machinery or space-limited environments.

Environmental Conditions

Marine, desert, or arctic conditions require corrosion-resistant materials, seals, and special greases.

LDB offers anti-rust coatings and special sealing options for harsh environments.

Mounting and Maintenance

Evaluate ease of installation, lubrication accessibility, and service intervals.

LDB provides detailed mounting instructions and optional maintenance-free solutions.

LDB Slewing Bearing Solutions

As a global manufacturer and supplier, LDB offers a comprehensive line of slewing bearings engineered for industrial, construction, and energy applications. All products are manufactured under ISO 9001 standards and can be customized according to project requirements.

Popular Models:

Four Point Contact Ball Slewing Bearing (LDB-FQ Series)

Double Row Ball Slewing Bearing (LDB-DB Series)

Three-Row Roller Slewing Bearing (LDB-TR Series)

Cross Roller Slewing Bearing (LDB-CR Series)

Flanged Slewing Bearing (LDB-FL Series)

Price Considerations

Slewing bearing prices vary depending on size, material, and load capacity. Below is a general guide:

Bearing TypeTypical Price Range (USD)
Four Point Contact Ball$150 – $600
Double Row Ball$400 – $1000
Three-Row Roller$900 – $3000+
Cross Roller$300 – $1200
Flanged Slewing Bearing$180 – $800

LDB provides factory-direct pricing, volume discounts, and tailored quotes for OEM and system integrators.

Finding the Right Manufacturer and Supplier

Choosing a reliable slewing bearing supplier is essential for ensuring performance, safety, and longevity. LDB stands out by offering:

Global delivery capabilities

In-house design and technical support

Long-term spare parts availability

Custom manufacturing options (diameter, bolt pattern, coating)

As a trusted manufacturer, LDB has successfully served customers in over 50 countries and supports industries ranging from construction to clean energy.

Why Choose LDB?

20+ Years of Experience in slewing technology

Advanced Production Lines and CNC machining centers

Testing Facilities for load, vibration, and fatigue simulation

Comprehensive Product Catalog with over 1000 models

After-Sales Support including technical training and online diagnostics

Conclusion

Selecting the right slewing bearing is about more than size—it’s about load, precision, environment, and reliability. By understanding the key bearing types and application needs, you can optimize performance and extend machine life. With LDB’s technical support, manufacturing excellence, and global service, you can confidently select the ideal slewing bearing solution.

Ready to choose your bearing? Contact LDB today for a tailored recommendation and competitive pricing.

How to Choose the Right Slewing Bearing for Construction Equipment Applications

What Is a Slewing Bearing?

A slewing bearing is a precision-engineered mechanical component that facilitates rotational movement between two structures. It supports axial, radial, and moment loads, and is commonly used in construction equipment such as cranes, excavators, concrete pumps, and aerial work platforms. These large-diameter bearings are critical for heavy-duty turning applications, enabling machines to rotate smoothly while managing intense loads and environmental stress.

Choosing the right slewing bearing is not just a matter of size—it requires a thorough understanding of application needs, load dynamics, environmental conditions, and product lifespan. In this article, we’ll walk you through a complete guide to selecting the best slewing bearing for construction machinery.

Key Factors When Selecting Slewing Bearings

Load Type and Magnitude

Understand whether your machine is exposed to:

Axial loads (vertical weight)

Radial loads (horizontal stress)

Overturning moment (torque from off-center loads)

For instance:

Excavators require strong moment load resistance

Tower cranes need high axial load-bearing capacity

Drilling rigs must handle both high torque and axial thrust

Use accurate force analysis or simulation data (like FEA) to determine expected load ranges.

Rotation Speed and Duty Cycle

Aerial platforms with slow, infrequent rotation require different bearings than high-speed drilling rigs or tunnel boring machines. Choose:

Ball slewing bearings for low-speed, low-friction applications

Roller slewing bearings for high-load or rotational inertia

Installation Space and Mounting Type

Assess diameter, bolt hole placement, and flange structure:

Internal gear bearings save external space

External gear allows better torque transmission

Non-gear options exist for systems using external drives

Recommended Slewing Bearing Types for Construction Equipment

Four Point Contact Ball Slewing Bearing

Excellent for cranes and work platforms

Handles combined loads efficiently

Compact and cost-effective

Double Row Ball Slewing Bearing

Supports higher axial and radial loads

Used in heavy-duty crawler cranes and drilling machines

Higher stability due to dual-row configuration

Cross Roller Slewing Bearing

High stiffness and precision

Ideal for tight installation spaces

Preferred in high-torque applications like foundation machines

Three-Row Roller Slewing Bearing

Superior load handling in all directions

Large size, heavy-duty

Suitable for bucket wheel excavators and heavy mining cranes

Environmental Considerations

Construction equipment faces harsh field conditions:

Dust and sand (grit contamination risk)

Mud and water (requires IP-rated sealing)

Temperature extremes (from -30°C to +70°C)

LDB slewing bearings are available with:

Triple lip seals

Grease ports for regular lubrication

Chrome-plated raceways for corrosion resistance

Customization and Mounting Options

Some machines require non-standard mounting holes or flange connections. LDB offers:

Custom bolt hole patterns

Split bearings for large-diameter applications

Optimized raceway geometry

Reinforced gear tooth hardening for longer service life

Typical Price Range and Procurement Tips

The price of slewing bearings for construction depends on:

Outer diameter and gear type (internal/external/no gear)

Load class and material grade

Sealing systems and certification (CE, ISO, etc.)

Typical Price Range: USD $400 – $6,000 per unit
Custom-engineered options may cost more depending on complexity and volumes.

To find a reliable manufacturer or supplier, consult technical teams and request:

2D/3D drawings

Load rating documentation

Lifetime fatigue calculation

Visit www.ldb-bearing.com for quotes and technical assistance.

Why LDB Is a Trusted Partner in the Construction Industry

LDB is a globally recognized manufacturer and supplier of slewing bearings for heavy-duty construction applications. With:

20+ years of experience

Advanced CNC production lines

Custom machining for OEM partners

Robust inventory and fast shipping options

LDB supports clients from design to delivery. Our products are used in:

Mobile and tower cranes

Tracked excavators

Earth drills and piling rigs

Material handling booms

Final Advice: Ask the Right Questions

Before placing an order, ask:

What’s the actual working load and peak load?

What’s the expected rotational speed and duty cycle?

Is environmental protection a priority?

Are maintenance intervals important?

Choosing the wrong bearing can lead to frequent breakdowns or costly repairs. LDB ensures that your slewing bearing delivers reliable, long-term performance no matter how tough the construction site.

For application-matched solutions, contact us at www.ldb-bearing.com.

2025 Trends in Slewing Bearing Technology: The Shift Toward Smart and Lightweight Design

What is a Slewing Bearing?

A slewing bearing is a large-diameter rotational bearing that can support axial, radial, and moment loads simultaneously. It enables rotation between two structural elements, often without needing a central shaft. Slewing bearings are integral components in construction machinery, wind turbines, industrial robots, medical imaging equipment, and solar tracking systems. Traditionally, they have been passive mechanical components. However, with the rise of intelligent manufacturing and sustainability demands, the future of slewing bearings lies in smart features and lightweight design.

Trend 1: Smart Integration

As Industry 4.0 takes hold, the demand for intelligent mechanical components is increasing. Slewing bearings are no exception. The following smart technologies are revolutionizing the design and use of these critical parts:

Embedded Sensor Technology

Modern slewing bearings now come with embedded sensors for real-time monitoring of operational parameters such as:

Load (strain gauges)

Temperature (thermal sensors)

Vibration (accelerometers)

Angular position (encoders)

These sensors allow predictive maintenance by alerting users to anomalies before they become critical failures. For example, temperature spikes could indicate lubrication breakdown, prompting proactive service.

Remote Monitoring and IoT Compatibility

By connecting sensors to IoT platforms, maintenance teams can monitor slewing bearing performance from remote locations. Integration with SCADA systems and cloud dashboards allows for:

Trend analysis over time

Scheduling of preventive maintenance

Integration into ERP systems for automated inventory management

Integration with AI and Control Systems

Some advanced slewing bearing systems can now be part of a feedback loop in automated machines. AI-enabled analysis of motion and load data helps optimize operations, extend service life, and enhance safety.

Case Example: LDB’s sensor-integrated slewing bearings are being used in offshore cranes, where remote diagnostics are essential due to limited access and high maintenance costs.

Trend 2: Lightweight Engineering

With the global shift toward energy efficiency, manufacturers are prioritizing weight reduction in industrial components. Slewing bearings are undergoing a redesign focused on reducing mass while maintaining strength and performance.

Advanced Material Selection

High-strength, low-density alloys like 42CrMo4, QT steels, or aluminum-bronze composites are replacing traditional steel where applicable. These materials offer:

Reduced weight without sacrificing durability

Higher corrosion resistance for marine and outdoor applications

Enhanced fatigue strength

Structural Optimization

LDB engineers use Finite Element Analysis (FEA) to simulate stress distribution in bearing races and gear teeth. This allows for precision thinning and optimized groove design, reducing unnecessary mass.

Additive Manufacturing Possibilities

For small-batch or specialized applications, 3D printing can produce lattice-structured bearing components. These designs minimize material use while maintaining structural integrity.

Compact Design Trends

Instead of relying on over-engineered universal bearings, custom-built, application-specific designs reduce bulk. LDB has developed ultra-compact four-point contact ball bearings for use in mobile robotics where every gram matters.

LDB Bearing’s Smart & Lightweight Solutions

As a global manufacturer and trusted supplier, LDB Bearing leads in integrating smart technology and lightweight design into slewing bearing solutions. Our innovations include:

Sensor-Embedded Slewing Bearings for condition monitoring

Lightweight Cross Roller Slewing Bearings for robotic joints

Customized Slim Profile Bearings for solar tracking systems

High-torque, low-weight flanged bearings for mobile cranes

Cloud-ready products that work with modern industrial IoT platforms

We provide tailored solutions for customers in renewable energy, construction, logistics automation, and aerospace.

Price and Procurement Insights

When selecting smart or lightweight slewing bearings, the following factors affect price:

Sensor configuration and number of channels

Special coatings (e.g., zinc plating, epoxy painting)

Custom geometries or bolt hole arrangements

Sealing and lubrication systems

Size (outer diameter range from 200 mm to 4000 mm)

Typical pricing for smart or advanced lightweight slewing bearings ranges from USD $300 to $5,000, depending on complexity and volume. For detailed specs and quotes, LDB offers 1-on-1 technical consultation and CAD modeling support.

To connect with a certified supplier or manufacturer, visit www.ldb-bearing.com.

Why These Trends Matter

BenefitImpact
Smart FeaturesIncreased uptime, fewer breakdowns
Lightweight EngineeringEnergy savings, faster machine dynamics
Remote MonitoringLower maintenance costs
Predictive DiagnosticsReduced unexpected downtime
Compact DesignEasier integration, smaller footprints

Conclusion

In 2025, the slewing bearing industry is no longer defined by strength alone. The convergence of intelligent systems and lightweight performance is reshaping the product landscape. Customers are demanding more than just rotation—they seek data, efficiency, and adaptability.

LDB Bearing stands at the frontier of these developments. As a global manufacturer and supplier, we deliver slewing bearing solutions engineered not just to turn—but to think, report, and evolve.

Ready to learn more or request a project-specific quote? Contact us at www.ldb-bearing.com today.