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Help CenterFour Point Contact Ball Slewing Bearing External Gear Turntable Bearing for Excavator
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Henan San Kuang Machinery Technology Co., Ltd. is a professional manufacturer dedicated to producing high-quality slewing bearings and turntable bearings. Located in Luoyang, Henan, China, the bearing capital of the country, our factory covers an area of 10,000–30,000 square meters with 51–100 skilled employees. Since 2022, we have been exporting to over 20 countries including North America, Europe, Southeast Asia, and Oceania, with an annual export value between US$2.5 million and US$5 million. Our Four Point Contact Ball Slewing Bearing with External Gear is specifically engineered for excavators and other heavy machinery that demands reliable rotation, high load capacity, and long service life. This bearing is the core component of your excavator’s swing mechanism, and we ensure every unit is manufactured with strict quality control and precision machining.
Key Features & Technical Specifications
- Four Point Contact Ball Design – Optimized contact angles (45° or 60°) allow the bearing to handle combined axial, radial, and moment loads simultaneously. This is ideal for excavator slewing motions where forces come from multiple directions.
- External Spur Gear Integrated – The outer ring is machined with high-precision teeth (module M2–M10, customizable) to match your excavator’s pinion. The gear teeth are induction hardened for wear resistance.
- High-Strength Material – Made from 50Mn or 42CrMo steel, the bearing rings are forged or rolled, then heat-treated (quenching & tempering) to achieve optimal hardness and toughness.
- Sealing & Lubrication – Dual lip seals on both sides protect against dust, mud, and moisture. The bearing is pre-filled with lithium-based grease for immediate operation, and regreasing points are provided for maintenance.
- Precision Machining – Raceways are ground to achieve smooth rotation and consistent clearance (C0 or C3 available upon request). Each bearing is tested for running torque and axial/radial runout.
- Custom Options – We can modify outer diameter, inner diameter, height, tooth parameters, mounting holes, and special sealing materials (e.g., Viton for high temperature) according to your application.
| Parameter | Typical Range (Customizable) | Notes |
|---|---|---|
| Outer Diameter (OD) | 500 mm – 2500 mm | Can be extended per request |
| Inner Diameter (ID) | 300 mm – 2000 mm | Matched with OD |
| Overall Height (H) | 80 mm – 200 mm | Depends on load rating |
| Gear Module | M2 – M12 | External gear teeth |
| Number of Teeth | 30 – 150 | Custom |
| Dynamic Load Rating (Ca) | 100 kN – 1500 kN | Calculated per design |
| Static Load Rating (Coa) | 300 kN – 3000 kN | Conservative figures |
| Operating Temperature | -20°C to +80°C | High-temp seals available |
Our bearings are designed to meet the rigorous demands of excavator swing systems. The four point contact configuration ensures stable rotation even when the excavator is digging, lifting, or swinging under heavy load. Compared with traditional cross-roller or single-row ball bearings, the four-point contact ball design offers a higher capacity-to-weight ratio and lower friction, which improves fuel efficiency and reduces wear on the excavator’s swing drive.
Benefits for Your Excavator
- Increased Machine Uptime – The durable raceways and tough materials reduce the risk of sudden failure, allowing your excavator to work longer without bearing-related downtime.
- Smooth, Precise Swing Motion – Tight tolerances and proper clearance control give the operator a comfortable, predictable feel during swing maneuvers, especially critical in precise grading or lifting.
- Low Maintenance – The sealed design retains grease and blocks contaminants. With top-quality seals and grease, service intervals can be extended to 500–1000 hours depending on working conditions.
- Multiple Mounting Options – The bearing ring can be custom drilled for bolt patterns that match existing excavator parts. This makes replacement or initial installation straightforward.
- Cost-Effective Replacement – We offer competitive pricing for both original equipment and aftermarket applications. Our direct factory supply eliminates middleman costs and ensures consistent quality.
Trusted by Global Customers
Henan San Kuang Machinery Technology Co., Ltd. has served clients in North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, the Middle East, and many other regions. Our factory is equipped with advanced CNC milling, turning, gear cutting and grinding machines, and our in-house heat treatment line ensures stable mechanical properties. All bearings undergo a 100% inspection process including non-destructive testing (magnetic particle and ultrasonic) before shipment. We ship from four convenient ports: Shanghai, Lianyungang, Qingdao, and Tianjin, ensuring efficient logistics worldwide. With a dedicated team of engineers and sales staff, we provide technical support to help you select the right bearing for your excavator model (e.g., Komatsu, Caterpillar, Hitachi, SANY, etc.).
Choose our Four Point Contact Ball Slewing Bearing for your excavator and experience improved durability, smoother rotation, and reduced total cost of ownership. Whether you need a standard size or a custom design, we are ready to work with you. Contact us today for a quotation or technical drawing!
Why Henan San Kuang?
- Factory size: 10,000–30,000 m² – large production capacity for fast delivery.
- Annual export value US$2.5–5 million – proven global supply capability.
- 51–100 experienced workers – skilled craftsmanship and rigorous quality control.
- Multiple shipping ports – flexible and economical freight solutions.
Frequently Asked Questions
-
Q: What excavator models does this bearing fit?
A: Our bearings are available in many standard dimensions and can be custom-made to match any brand or model. Please provide your original bearing drawings or dimensions, and we will confirm compatibility. -
Q: Can I order a single bearing for replacement?
A: Yes, we accept both OEM volume orders and single-unit replacement orders. Minimum order quantity (MOQ) is negotiable for standard sizes. -
Q: How long does the bearing last under normal excavator working conditions?
A: Service life depends on load, speed, maintenance, and environment. Typically, our bearings last 3,000 to 8,000 hours with proper lubrication and sealing. Actual life may vary. -
Q: Do you offer installation guidance or technical support?
A: Yes, we provide free technical support via email or video call. We also supply installation instructions and recommended torque values for mounting bolts. -
Q: What is the typical lead time?
A: For standard sizes without customization, lead time is 15–25 days after confirmation. For custom designs, it is 25–40 days depending on complexity. -
Q: How is the bearing packaged to prevent damage during shipping?
A: Each bearing is individually rust-proofed, wrapped in anti-corrosion paper, and packed in a strong wooden crate with foam support. This ensures safe sea and land transport. -
Q: Can you provide a certificate of material or inspection report?
A: Yes, we can provide material test certificates (MTC) for the steel used, along with our factory’s inspection report. Third-party inspection (e.g., SGS) is also available upon request at additional cost.
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