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Double-Row Ball Slewing Ring Bearing
2. Product structure: double-row ball with equal diameter, double-row ball with different diameter
3. Size Range: Inner Bore Diameter: From approximately 50 mm to over 2000 mm
Cross-Section Height: Ranges from 20 mm to 100 mm
4. Material: Ring Material: High-strength 50Mn or 42CrMo alloy steel
Rolling Elements: High-precision, high-hardness GCr15 bearing steel balls
Seal Strip: Oil-resistant and wear-resistant nitrile rubber (NBR) seals
5. Applications: Construction machinery, material handling equipment, industrial equipment
- Product Description
Double-Row Ball Slewing Ring Bearing - Precision Engineered for Heavy-Duty Applications
Product Details
When your application demands high load capacity within a constrained space, the Double-Row Ball Slewing Ring Bearing delivers exceptional performance. This precision-engineered component features two rows of hardened steel balls operating in optimized raceways, enabling it to manage complex load combinations—including axial forces, radial loads, and tilting moments—simultaneously. Unlike single-row designs, this configuration provides superior rigidity and load distribution, making it the ideal choice for applications where space is at a premium but performance is paramount.
Our double-row ball Slewing Bearings are manufactured from high-grade alloy steels such as 50Mn and 42CrMo. Each unit undergoes precision forging and controlled heat treatment to achieve the optimal core toughness and raceway hardness. The rolling elements are crafted from GCr15SiMn bearing steel, ensuring smooth and reliable rotation under the most demanding conditions. With inner bore diameters available from 50 mm to over 2000 mm, these bearings can be fully customized to meet your specific mounting configurations and operational load profiles.
Why Choose Us?
Manufacturing Excellence
Located in Luoyang, China's bearing industry hub, we bring over 20 years of specialized experience in slewing bearing production. Our facility houses CNC vertical lathes, CNC quenching machines, CNC Gear shapers, and precision grinding equipment. This allows us to control every manufacturing step in-house.
Precision Capabilities
We manufacture bearings across four precision grades: P0, P6, P5, and P4. Our coordinate measuring machines and vibration testing equipment verify that each bearing meets specified tolerances before shipment.
Global Reach
Our products serve customers in over 50 countries, including the United States, Germany, South Africa, Australia, and throughout the Middle East. This international experience helps us understand diverse application requirements and regional standards.
Customization Support
Beyond standard catalog items, we provide personalized non-standard customization. Our engineering team can work with your 3D drawings or perform old product mapping to create exact replacement bearings. We also manufacture related components such as large gears, ring gears, and couplings.
Technical Specifications
Parameter | Specification |
Bearing Type | Double-Row Ball Slewing Ring |
Ball Arrangement | Back-to-back or face-to-face configuration |
Inner Bore Diameter | 50 mm – 2000+ mm |
Cross-Section Height | 20 mm – 100 mm |
Ring Material | 50Mn or 42CrMo alloy steel |
Rolling Element Material | GCr15 high-precision bearing steel |
Seal Type | Nitrile rubber (NBR), oil and wear resistant |
Precision Grades Available | P0, P6, P5, P4 |
Load Capacity | Axial, radial, and moment loads simultaneously |
Mounting Configuration | Standard bolt hole patterns or custom flange interfaces |
Operating Temperature Range | -30°C to +80°C (standard seals) |
Compliance Standards | ISO, DIN, GB |
Features and Benefits
Dual-Row Load Distribution
Compared to single-row designs, the two-row ball configuration distributes loads across a greater number of contact points. This reduces contact stress and extends service life, especially in applications with variable or dynamic loading conditions.
Compact Cross-Section
This Double-Row Ball Slewing Ring Bearing delivers high load capacity within a minimal mounting envelope. Its optimized raceway geometry enables installation in tight spaces where larger three-row roller bearings would be impractical.
Zero-Clearance Operation
Our precision manufacturing process allows for zero-clearance adjustment during installation. This feature is critical for applications such as wind turbine pitch systems and other high-precision machinery that require accurate positioning without backlash.
Multiple Ball Diameter Options
We offer configurations with either equal-diameter balls or different-diameter balls in each row. The different-diameter design can optimize load distribution to match specific load profiles in your application.
Sealed Protection
Standard NBR seals effectively shield the internal raceways from contaminants while retaining lubricant. This extends maintenance intervals and enhances reliability in dusty, humid, or outdoor operating environments.
Applications
Wind Energy Systems
Pitch control systems in wind turbines rely on these bearings to adjust blade angles. Their zero backlash design and high starting torque accuracy meet the demanding requirements of dynamic pitch control.
Construction Machinery
Concrete pump trucks, mobile cranes, and aerial work platforms utilize these bearings in slewing and boom rotation systems. Their ability to handle combined loads makes them suitable for equipment subjected to complex load cycles.
Material Handling Equipment
Port cranes, ship loaders, and stacker reclaimers benefit from the compact design and smooth slewing rotation these bearings provide during continuous operation.
Industrial Turntables
Welding positioners, rotary indexing tables, and automated production equipment use these bearings where precise positioning and repeatability are essential.
Medical Equipment
CT scanners and advanced imaging systems incorporate smaller diameter variants where smooth, quiet, and reliable rotation is critical for system performance.
Testing & Certification
Our quality administration framework is ISO 9001 certified. All items comply with RoHS orders for natural security. Each bearing experiences dimensional assessment utilizing arrange measuring machines, vibration testing to confirm smooth operation, and hardness testing to affirm appropriate heat treatment. Total traceability documentation goes with each arrange,from raw material certifications to final inspection reports.
Installation Guide
1. Preparation
Thoroughly clean all mounting surfaces. Verify that bolt hole alignment and surface flatness are within the specified tolerances provided in the technical drawings.
2. Positioning
Carefully place the bearing onto the prepared mounting surface. Align all bolt holes and ensure the bearing rests fully flush without any gaps.
3. Bolt Tightening
Install all bolts and tighten them gradually in multiple passes (e.g., 30%, 60%, then 100%) following a star (cross) pattern. This ensures uniform clamping force and prevents distortion.
4. Clearance Verification
After the initial tightening, manually rotate the bearing. It should turn smoothly, without any binding, uneven resistance, or audible grinding noise.
5. Final Torque & Locking
Apply the final specified torque value to each bolt. Secure them using the approved locking method as indicated in your documentation—such as lock washers, thread-locking adhesive, or lock plates.
6. Lubrication
Prior to commissioning, fill the bearing with the type and quantity of grease specified in the lubrication manual or product datasheet.
Exhibition
We attend many famous international exhibitions such as Shanghai International Maritime Exhibition,Mining World Russia, bauma China, CTT Russia, etc
Partners
Your trust, we cherish in heart all times and will reciprocate that trust with unwavering quality.
Packaging & shipping
Your goods are unique, and their journey should be flawless. Therefore, we offer professional and customized packaging services. Our experienced team will evaluate your goods' characteristics, transportation route, and environmental requirements to recommend the most secure solution, such as: wooden crate packaging, sturdy frame packaging, or composite reinforced packaging (wooden crate + iron frame).
Maintenance and Care
Beginning Break-In
During the first 100 hours of operation, monitor the bearing closely for any abnormal noise, vibration, or excessive temperature rise. Check all mounting bolt torques at the end of this period and re-tighten if necessary.
Lubrication Schedule
Under normal operating conditions, re-grease the bearing every six months. Increase the lubrication frequency in harsh environments characterized by high levels of contamination, extreme temperatures, or continuous duty cycles. Use only the grease type specified in the product manual to avoid compatibility issues and ensure optimal performance.
Periodic Inspection
Perform a comprehensive annual inspection by following these steps:
Inspect Seals: Visually check all seals for signs of damage, cracking, hardening, or excessive wear.
Check for Leaks: Look for any evidence of lubricant leakage around the seals or mounting surfaces.
Listen for Abnormalities: During operation, listen for any unusual noises such as grinding, clicking, or irregular humming, which may indicate contamination, wear, or misalignment.
Verify Bolt Torque: Check and re-torque all mounting bolts to the specified value as part of the annual maintenance routine.
Storage
If storing spare bearings, keep them in a clean, dry environment with a stable temperature between 10°C and 30°C (50°F to 86°F). Coat all exposed machined surfaces with a rust-preventive oil or anti-corrosion spray. Periodically rotate the bearings (e.g., every 3–6 months) to redistribute the internal grease and prevent settling or false brinelling.
FAQ
Q: What is the difference between equal and different diameter ball configurations?
A: Equal-diameter balls provide symmetric load capacity in both axial directions. Different-diameter configurations allow for optimized load distribution in applications where axial loading is predominantly in one direction, increasing the effective capacity for that specific load case.
Q: Can these bearings replace three-row roller slewing bearings?
A: In certain space or weight sensitive applications, yes. While three row roller bearings are designed for higher ultimate loads, our double row ball bearings offer significant advantages where a compact cross section, smooth rotation, and lower starting torque are prioritized.
Q: What accuracy grade should I specify?
A: Grade P0 is suitable for general industrial applications. Grade P6 offers improved rotational precision for construction machinery. Grades P5 and P4 are specified for high precision positioning systems and applications requiring minimal runout and vibration.
Q: Do you provide installation drawings?
A: Yes. A complete set of dimensional drawings is included with each order, detailing bolt hole patterns, specified torque values, mounting interface tolerances, and seal locations.
Q: What is your typical lead time for custom sizes?
A: Standard catalog items are typically shipped within 2 3 weeks. Custom, non standard bearings require 6 8 weeks for engineering and manufacturing, depending on design complexity and the current production schedule.
Q: Can you manufacture bearings with gear teeth?
A: Absolutely. We routinely integrate external or internal gear teeth using our in house CNC gear shaping and hobbing equipment. This is a standard solution for applications requiring a directly driven slewing motion.
Contact Us
Need technical assistance or a custom solution? Our engineering team is ready to help you select the right Double-Row Ball Slewing Ring Bearing for your application. Reach out at mia@hgb-bearing.com for quotations and technical support.
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