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Slewing Bearings

Slewing bearings, also known as slewing rings, slewing ring bearings, or turntable bearings, consist of inner rings, outer rings, and rolling elements similar to other rolling bearings. They are typically designed with a large diameter and relatively small cross-sectional height. Mounting holes are provided in both rings, allowing the bearing to be directly fastened to the stationary and rotating structures. Depending on the design, they may be equipped with internal gears, external gears, or supplied without gears to transmit rotational motion.
Slewing bearings can simultaneously support axial loads, radial loads, and overturning moments. They are widely used in cranes, excavators, wind turbines, radar systems, and other large rotating equipment.
BKZ Industry, as a professional slewing bearing manufacturer, provides a wide range of slewing bearings, including single-row four-point contact ball, double-row ball, and crossed roller types, as well as customized solutions for different applications.

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Slewing Bearings Or Slewing Rings

Features, Benefits and Advantages of Slewing Bearings Manufactured by BKZ Industry

Overview of the key features, performance advantages, and manufacturing strengths of slewing bearings produced by BKZ Industry.

Features and Benefits of Slewing Bearings

Multi-direction Load Support

Designed with special raceway geometry and rolling element arrangements, such as four-point contact ball or roller structures. This allows them to simultaneously support axial loads, radial loads, and overturning moments while enabling 360° rotation.

High Load Carrying Capacity

The large diameter structure, multiple rolling elements, and optimized raceway contact design allow loads to be distributed over a larger contact area. This significantly increases the bearing’s ability to handle heavy combined loads.

Saving Installation Space

Feature a large diameter but relatively small cross-sectional height, forming a compact thin-section structure. This design supports large rotating structures while minimizing installation space and equipment weight.

Easy Installation

Mounting holes are provided in both the inner and outer rings, allowing the bearing to be directly bolted to the stationary and rotating structures. This eliminates the need for additional bearing housings and simplifies installation.

Long Service Life

High-quality bearing steel, optimized raceway design, proper heat treatment, and effective sealing and lubrication systems reduce wear and contact stress, ensuring reliable operation and extended service life even under demanding conditions.

Why BKZ Industry Slewing Bearings

ISO 9001 Certified & High Quality Control

BKZ Industry operates under an ISO 9001 certified quality management system, with strict inspection from raw material to finished products. Advanced equipment such as CNC vertical lathes, raceway grinding machines, heat treatment furnaces, and precision inspection systems ensure stable accuracy and reliable bearing performance.

 Professional Engineering and Design Team

BKZ Industry has 50+ bearing engineers, with most engineers having over 5 years of industry experience, providing support for bearing selection, load calculation, and application design.

Large Manufacturing Capacity

BKZ Industry operates 15+ production lines with a daily capacity of 60,000 units, ensuring consistent delivery and large-volume supply for global customers.

Complete Slewing Bearing Product Range

BKZ provides a full range of slewing bearings including: Single-row four-point contact ball, Double-row ball, Crossed roller, Three-row roller. Custom designs are also available based on load conditions, installation requirements, and application environments.

Strong After-Sales and Technical Support

BKZ Industry provides installation guidance, lubrication and maintenance recommendations, troubleshooting support, and fast technical response. When necessary, our engineers can provide on-site technical support to help ensure reliable bearing operation throughout the service life.

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Types of Slewing Bearings

Slewing bearings are typically available in four main types: four-point contact ball, cross roller, three-row roller, and double-row ball. BKZ Industry also provides customized slewing bearings to meet specific application requirements.

Four Point Slewing Bearings

Four Point Contact Ball Slewing Bearing

Featuring a single row of steel balls and a four-point contact raceway, this type supports axial, radial, and overturning loads simultaneously. Available with internal gear, external gear, or without gear, it is widely used in cranes and excavators.

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Cross Roller Slewing Bearings

Cross Roller Slewing Bearings

Using cylindrical rollers arranged in a crossed configuration, this design provides high rigidity and precise rotation. It can support axial, radial, and overturning loads and is commonly used in radar systems, robotics, and precision equipment.

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Three Row Roller Slewing Bearings

Three Row Roller Slewing Bearings

Designed with three rows of rollers, each row carries different loads separately. This structure offers very high load capacity and is widely used in large cranes, mining equipment, and heavy-duty machinery.

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Double Row Slewing Bearings

Double Row Slewing Bearings

Featuring two rows of steel balls with different diameters, this type provides improved load distribution and stability. It is suitable for construction machinery, material handling equipment, and other heavy applications.

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Customized Slewing Bearings

Customized Slewing Bearings

Engineered according to specific load conditions, installation dimensions, and operating environments. Customized designs help ensure optimal performance for special machinery and unique applications.

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**We also offer slewing bearings and other bearings not listed here . Contact us for more options.

Slewing Bearings size chart

Unlike many standard bearings, slewing bearings usually do not have fixed size charts because many designs are customized for specific applications. For reference, we provide several slewing bearing size charts based on projects we have supplied for customers. For exact specifications, please contact us directly.

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Type Common Series Category Structural Feature Typical Gear Options Typical Diameter Range (mm) Typical Height Range (mm) Typical Applications Relative Load Capacity Relative Rigidity Notes
Four-point contact ball Light series Single-row ball, thin-section Internal / External / None 200–2,500 40–120 Aerial platforms, compact cranes, light rotating equipment Medium Medium Space-saving and cost-effective for general use
Four-point contact ball Standard series Single-row ball, general section Internal / External / None 300–4,000 60–180 Excavators, truck cranes, general machinery Medium-High Medium Most widely used general-purpose structure
Double-row ball Heavy series Two rows of balls with different diameters Internal / External / None 400–4,500 80–220 Construction machinery, port equipment, larger rotating platforms High Medium-High Better axial load distribution and stability
Cross roller Precision series Crossed cylindrical rollers at 90° Internal / External / None 200–3,000 50–160 Radar, robotics, machine tools, precise positioning High High Higher rigidity and rotational accuracy
Three-row roller Heavy-duty series Three separate roller rows for separated loads Internal / External / None 500–6,000+ 120–300+ Large cranes, mining, offshore, heavy-duty platforms Very High Very High Best for demanding combined-load applications
Customized Project-specific series Designed to customer drawing / load case Internal / External / None As required As required Special machinery and non-standard projects As required As required Used when standard series cannot meet conditions

Applications of Slewing Bearings

Based slewing bearings load capacity, special desigm, and different types, slewing bearintgs can be applied in many applications. Popular ones are here.

FAQs About Slewing Bearings

Q1. What is the Torque of a Slewing Bearing?

The torque of a slewing bearing refers to the rotational resistance that must be overcome to rotate the bearing. It mainly includes friction torque from rolling elements, seals, lubrication, and load conditions. The required driving torque depends on bearing size, load, lubrication, and operating conditions.

Agricultural slewing bearings are slewing bearings designed for use in agricultural machinery and equipment. They are built to withstand harsh outdoor conditions such as dust, mud, moisture, and heavy loads while providing smooth rotational movement. Common types used in agricultural equipment include four-point contact ball slewing bearings and double-row ball slewing bearings, which offer reliable load capacity and stable rotation. These bearings are widely used in irrigation systems, harvesters, sprayers, bale wrappers, fertilizer spreaders, and grain handling equipment.

Yes, BKZ Industry can provide ceramic ball slewing bearings and other customized bearing solutions depending on application requirements. Ceramic rolling elements offer advantages such as corrosion resistance, lighter weight, and reduced friction for certain specialized applications.

An overturning moment is the tilting force acting on a slewing bearing caused by loads applied away from the center of rotation. It creates a tendency for the structure to tilt or overturn. Slewing bearings are specifically designed to support axial loads, radial loads, and overturning moments simultaneously.

Ball slewing bearings use steel balls as rolling elements and are suitable for moderate loads with smoother rotation. Roller slewing bearings use cylindrical rollers, which provide higher load capacity and rigidity. Roller types are typically used in heavy-duty applications such as cranes and mining equipment.

The maximum load capacity of a slewing bearing varies depending on its design, size, rolling elements, and material strength. Contact us with your application details and specifications, and we will recommend the most suitable solution.

Common causes of slewing bearing failure include insufficient lubrication, contamination from dust or debris, excessive loads, improper installation, and poor maintenance. Regular inspection, proper lubrication, and correct load selection are essential to extend bearing service life.

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Explore More Bearing Solutions from BKZ Industry

BKZ Industry provides a wide range of high-performance bearings beyond slewing bearings, including stainless steel bearings, ceramic bearings, high-temperature bearings, cross/universal joint bearings, and other specialized bearing solutions.

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Send us your bearing specifications and application details. Our engineering team will review your requirements and provide a fast, competitive quotation tailored to your project.

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Complete the form below for a quote, or contact us at sales@bkzindustry.com or +86 18901426056 (WhatsApp/phone).