Frame 47

Reliable Slewing Bearings for Demanding Applications

Aokai provides durable and precise slewing bearings designed to handle heavy loads and harsh environments. Our products are widely used in cranes, excavators, wind turbines, and more.

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Standard & Custom
Slewing Bearing Solutions

We also provide OEM and customized slewing bearing solutions to meet specific dimensions, gear configurations, sealing options, and performance requirements for global industrial applications.

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500+

Standard Types

100%

Quality Inspected

PRODUCTS

Our Slewing Bearing Product Range

Explore Aokai's complete line of slewing bearings, from single-row ball to three-row roller types, engineered for optimal load distribution and long service life.
VU Series

Four Point Contact Ball Bearings (Toothless)

Discover our high-precision four point contact ball bearings, designed for heavy-duty applications with toothless operation, ensuring durability and efficiency in mechanical systems.

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VSI Series

Four Point Contact Ball Bearings (Inner Gear)

Discover our precision-engineered four point contact ball bearings designed for inner gear applications, offering high load capacity and durability in heavy-duty machinery.

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VLA Series

Four Point Contact Ball Bearings (External Gear)

Discover our precision-engineered four point contact ball bearings with external gear, designed for heavy-duty applications in the mechanical industry.

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XSU Series

Cross Roller Bearing (Toothless)

Explore our toothless cross roller bearings, designed for high precision and minimal friction in mechanical applications. Ideal for robotics, aerospace, and heavy machinery.

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XSI Series

Cross Roller Bearing (Inner Gear)

Precision cross roller bearing designed for high load applications in mechanical engineering, featuring specific inner gear specifications for reliable performance.

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XSA Series

Cross Roller Bearing(External Gear)

Explore our precision cross roller bearing with external gear, designed for high-load applications in mechanical engineering. Ideal for heavy-duty machinery and industrial automation systems.

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Applicaiton

Industries That Rely on Aokai Slewing Bearings

From construction and mining to renewable energy, Aokai slewing bearings deliver reliable rotary motion in the toughest conditions.

Construction & Heavy Equipment

Slewing bearings provide stable rotation and high load support for excavators, crawler cranes, concrete pump trucks, and lifting equipment. Designed to withstand heavy impact loads, vibration, and harsh job-site conditions, they ensure reliable operation and extended equipment service life.

Wind Energy

Our slewing bearings are designed for wind turbines up to multi-megawatt levels, supporting precise blade pitch adjustment and nacelle yaw positioning. Advanced sealing, corrosion protection, and fatigue-resistant designs help ensure reliable operation throughout a 20-year service cycle.

Marine & Offshore

Marine equipment requires bearings that can withstand salt spray, humidity, and heavy loads. Our slewing bearings feature enhanced sealing systems and protective treatments for applications such as deck cranes, ship loading arms, offshore platforms, and mooring systems.

Industrial Automation & Machinery

Robotic cells, indexing tables, welding positioners, and rotary platforms demand high accuracy and repeatable positioning. Our precision slewing bearings deliver low friction, high rigidity, and smooth rotation for advanced industrial automation applications.

Material Handling Equipment

Stacker reclaimers, truck cranes, and mobile elevating work platforms require reliable rotation under frequent loading cycles. Our slewing bearings combine compact structure with high load capacity to improve equipment efficiency and operational reliability.

Tunnel Boring Machines

Tunnel boring machines operate under extreme axial and radial loads. Our large-diameter slewing bearings are engineered with high structural strength and wear resistance to support continuous rotation and demanding underground construction environments.

Military & Defense Equipment

Defense systems require exceptional accuracy, reliability, and durability. Our precision slewing bearings are designed for applications such as radar systems, armored vehicle turrets, and specialized platforms where stable rotation and long-term performance are essential.

Why Choose Us

Why Choose Aokai Slewing Bearings

Our slewing bearings are built with advanced heat treatment and precision grinding to ensure consistent performance. Here are key competitive advantages.

All raceways are made from 50Mn or 42CrMo alloy steel, hardened to 58-62 HRC for extended wear resistance.

CNC controlled raceway grinding achieves runout accuracy within 0.05 mm for critical applications.

Proprietary raceway profile design reduces contact stress and extends fatigue life by up to 30%.

Double-lip nitrile rubber seals protect against dust, water, and debris, with optional polyurethane for extreme environments.

Internal or external gears induction hardened and finish-ground for precise meshing and low noise.

Each bearing undergoes magnetic particle inspection on rings and roller elements to eliminate subsurface defects.

Optional manganese phosphate or PTFE-filled coating reduces friction and prevents fretting corrosion.

Serial numbers on every bearing allow tracking of batch, heat treat lot, and assembly date.

Custom slewing bearings

Custom Sizing & Specifications

Aokai provides fully customizable slewing bearings with a wide range of dimensions, materials, and accessories.

FAQ

FAQ & Technical Support

Get answers to common questions about slewing bearing selection, installation, maintenance, and Aokai's support services.

How do I choose the right slewing bearing for my application?
Consider the load type (axial, radial, moment), speed, duty cycle, and environmental conditions. Our engineers can help with a load calculation form and simulation.

Do you provide installation instructions?
Yes, each bearing comes with a detailed manual covering mounting, bolt torquing, and grease requirements. We also offer on-site training.

What is a slewing bearing?
A slewing bearing, also known as a slewing ring bearing or turntable bearing, is a large-diameter bearing designed to support axial loads, radial loads, and overturning moments simultaneously while allowing smooth rotational movement. Unlike standard bearings, slewing bearings integrate compact structure, high load capacity, and excellent rigidity, making them ideal for heavy-duty machinery and precision rotation systems.

What inspections are performed before delivery?
Professional manufacturers conduct comprehensive quality inspections before shipment to ensure product reliability.

Inspection items typically include:

Dimensional accuracy testing
Raceway hardness inspection
Gear accuracy measurement
Rotational torque testing
Clearance measurement
Surface quality inspection
Load testing (if required)
Inspection reports and material certificates can be provided according to customer requirements.

What is the typical lead time for custom bearings?
Standard sizes ship within 2–4 weeks. Custom designs require 6–10 weeks depending on complexity and raw material availability.

How often should slewing bearings be lubricated?
Under normal conditions, re-grease every 100 hours or 3 months, whichever comes first. For harsh environments, reduce interval to 50 hours.

What causes slewing bearing failure?
Common causes of slewing bearing failure include improper installation, insufficient lubrication, excessive loading, contamination, seal damage, and incorrect maintenance.

Typical failure signs include:

Increased operating noise
Excessive rotational resistance
Abnormal vibration
Increased clearance
Raceway wear or cracking
Regular inspection and correct maintenance can significantly reduce unexpected downtime.

What is the service life of a slewing bearing?
The service life of a slewing bearing depends on load conditions, operating environment, lubrication, installation accuracy, and maintenance practices.
Factors that extend bearing life include:
Correct bearing selection
Proper installation
Regular lubrication
Effective sealing protection
Periodic inspection and maintenance
For critical applications, customized designs can be developed to meet specific service life requirements.