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Help CenterInternal Gear Slewing Bearing With 420x340mm Cross Section, 40Cr Material, for Excavator
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Welcome to Henan San Kuang Machinery Technology Co., Ltd. – a professional manufacturer specializing in high-performance slewing bearings for heavy machinery. Our Internal Gear Slewing Bearing with 420x340mm Cross Section, 40Cr Material is engineered specifically for excavators, delivering exceptional rotational stability and long service life. With over 10,000 square meters of factory space and a dedicated R&D team, we ensure every bearing meets rigorous quality standards. This product is a direct result of our commitment to providing reliable, cost-effective solutions for the global construction and mining sectors.
The bearing features a robust internal gear design that integrates seamlessly with excavator swing drives. Its 40Cr alloy steel construction provides high tensile strength and wear resistance, allowing it to withstand heavy loads and harsh working conditions. Whether you need a replacement part or an OEM solution, our bearing offers precise geometry and smooth rotation, reducing downtime and maintenance costs.
Below we detail the key specifications, advantages, and frequently asked questions to help you make an informed purchasing decision.
Key Specifications
| Parameter | Value |
|---|---|
| Cross Section (Width × Height) | 420 mm × 340 mm |
| Material | 40Cr Alloy Steel (Quenched & Tempered) |
| Gear Type | Internal Gear (Module optional, typical 8-12) |
| Precision Grade | P5 (P4, P6 available upon request) |
| Hardness (Raceway) | HRC 55-60 (Induction hardened) |
| Surface Treatment | Black Oxide, Phosphating, or Custom |
| Application | Excavator (20-50 ton class), Crane, Rotary table |
| Operating Temperature | -40°C to +80°C |
Product Features & Benefits
Superior Load Capacity: The 40Cr material combined with optimized raceway geometry delivers high radial, axial, and moment load capacity, suitable for demanding excavator swing motions.
Extended Service Life: Induction hardened raceways (HRC 55-60) and precise grinding minimize wear, reducing the need for frequent replacements.
Smooth Rotation: Precision-ground internal gear and preloaded ball/roller elements ensure low friction and stable operation even under eccentric loads.
Easy Installation: Standard bolt holes and locating surfaces facilitate direct mounting onto excavator swing drives – no additional adapters required.
Customizable Options: We offer various gear modules, tooth counts, seal types (e.g., double lip seals), and lubrication fittings to match your specific excavator model.
Cost-Effective: As a manufacturer, we eliminate middlemen, providing competitive pricing without compromising quality. OEM/ODM services are welcome.
Rigorous Quality Control: Every bearing undergoes 100% inspection for dimensions, hardness, gear accuracy, and rotational performance before shipment.
Why Choose Our Slewing Bearing?
Henan San Kuang Machinery Technology Co., Ltd. is a trusted supplier to markets in North America, South America, Eastern Europe, Southeast Asia, and more. Our factory spans over 10,000 square meters with dedicated heat treatment, machining, and assembly workshops. With an annual export value exceeding US$2.5 million, we have shipped thousands of slewing bearings to satisfied customers worldwide.
We understand the critical role of the slewing bearing in excavator performance. Our internal gear design ensures precise torque transmission, while the 40Cr material provides excellent toughness to resist impact loads. The 420x340mm cross section is ideal for medium-to-large excavators, offering a balance of strength and compactness.
Additionally, we offer free technical consultation for selecting the right bearing specifications and mounting parameters. Our lead time for standard sizes is 15–20 working days, with expedited options available for urgent orders.
Frequently Asked Questions
Q: What is the maximum dynamic load rating of this bearing?
A: The dynamic load rating varies with the specific gear module and ball/roller configuration. For the standard design, the radial dynamic load is approximately 280 kN, axial dynamic load 350 kN, and moment load 400 kN·m. Please contact our engineers for exact calculations based on your application.Q: Can this bearing be used on excavators other than the specified size?
A: Yes. The 420x340mm cross section fits most excavators in the 20–50 ton class. However, we recommend providing your original bearing dimensions (outer diameter, inner diameter, height, and bolt pattern) to confirm compatibility.Q: What type of lubricant should be used?
A: We recommend a lithium-based grease with EP additives (NLGI grade 2). The bearing is pre-lubricated with high-quality grease before shipment. Regreasing intervals depend on operating conditions – typically every 500 hours for heavy-duty use.Q: Is the bearing supplied with seals?
A: Standard bearings come with double lip seals made of NBR rubber to prevent dust and moisture ingress. For underwater or extremely dusty environments, we can provide FKM seals (Viton) as an option.Q: What is the warranty period?
A: We offer a 12-month warranty from the date of shipment against manufacturing defects. Any failure due to improper installation or abnormal use is not covered. Extended warranty is negotiable for bulk orders.Q: Do you provide installation instructions?
A: Yes, a detailed installation manual is included with each bearing. We also offer video guidance upon request. Proper mounting torque and bolt tightening sequence are critical – our team can assist via email or call.Q: Can the gear module be customized?
A: Absolutely. We can modify the internal gear module (e.g., from module 10 to module 12) to match your excavator's drive pinion. Tooth profile modifications (e.g., shifting) are also available. Lead time may adjust depending on complexity.Q: How is the bearing shipped and packaged?
A: Each bearing is individually wrapped with anti-rust paper, placed in a wooden crate, and secured with foam padding. We ship from multiple Chinese ports (Shanghai, Qingdao, Tianjin, etc.) via sea or air freight. FOB, CIF, and EXW terms are available.
Trust Henan San Kuang Machinery – Your Reliable Partner in Slewing Bearing Solutions. With our advanced manufacturing capabilities, strict quality assurance, and responsive customer service, we are confident that our Internal Gear Slewing Bearing will meet and exceed your expectations. Contact us today for a quotation or to discuss your custom requirements. Let us help your excavator perform at its best!
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