When your tower crane demands reliable rotational performance, the Tower Crane Slewing Bearing serves as the critical component connecting the tower body and boom assembly. This specialized bearing enables 360-degree rotation while supporting complex combined loads including radial forces, axial loads, and tilting moments. Our triple-row roller design provides superior load distribution and operational stability for heavy-duty construction applications. With 30 years of manufacturing experience, Luoyang Auto Bearing delivers precision-engineered solutions that ensure your equipment operates smoothly under the most demanding conditions.

A product functions as the rotational joint between the crane's fixed tower and rotating superstructure. This large-diameter bearing assembly consists of inner and outer rings with precision-machined raceways that accommodate rolling elements.
The bearing's primary function involves supporting the crane's upper frame while enabling smooth slewing motion. During operation, it simultaneously handles multiple load types:
Modern tower crane applications require bearings that maintain positional accuracy while withstanding shock loads and continuous operation cycles. Our slewing bearings incorporate advanced sealing systems and lubrication channels to ensure reliable performance in harsh construction environments.
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Bearing Type
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Model Number
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Internal Diameter (d) mm
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External Diameter (D) mm
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Width (B) mm
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Static Load Capacity (C₀) kN
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Dynamic Load Capacity (C) kN
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Rolling Element Type
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Material
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Sealing Structure
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Lubrication Method
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Application Scenarios
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Weight kg
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Single-row Four-point Contact Ball Slewing Ring
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011.25.400
|
400
|
540
|
48
|
620
|
280
|
Steel Ball
|
42CrMo
|
Double Lip Rubber Seal
|
Lithium-based Grease (NLGI 2)
|
Small cranes, aerial work platforms
|
42
|
|
|
011.25.500
|
500
|
650
|
56
|
850
|
380
|
Steel Ball
|
42CrMo
|
Double Lip Rubber Seal
|
Lithium-based Grease (NLGI 2)
|
Tower cranes, port loading machinery
|
68
|
|
|
011.25.630
|
630
|
800
|
65
|
1200
|
550
|
Steel Ball
|
42CrMo
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Double Lip Rubber Seal
|
Lithium-based Grease (NLGI 2)
|
Mobile cranes, concrete mixers
|
105
|
|
|
011.25.800
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800
|
1000
|
75
|
1800
|
820
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Steel Ball
|
42CrMo
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Double Lip Rubber Seal + Dust Cover
|
Lithium-based Grease (NLGI 2)
|
Large-tonnage truck cranes
|
185
|
|
Single-row Crossed Roller Slewing Ring
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021.20.315
|
315
|
430
|
40
|
950
|
420
|
Crossed Roller
|
42CrMo
|
Metal Face Seal
|
High-temperature Lithium-based Grease
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Robotic arms, precision rotary tables
|
35
|
|
|
021.20.400
|
400
|
520
|
45
|
1500
|
680
|
Crossed Roller
|
42CrMo
|
Metal Face Seal
|
High-temperature Lithium-based Grease
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CNC machine tools, radar antennas
|
58
|
|
|
021.20.500
|
500
|
650
|
50
|
2000
|
920
|
Crossed Roller
|
42CrMo
|
Metal Face Seal
|
High-temperature Lithium-based Grease
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Precision machining centers, satellite communication equipment
|
92
|
|
|
021.20.630
|
630
|
780
|
55
|
2800
|
1250
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Crossed Roller
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42CrMo
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Metal Face Seal + Oil Seal
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High-temperature Lithium-based Grease
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Large precision rotary platforms
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145
|
|
Double-row Ball Slewing Ring
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022.30.630
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630
|
850
|
70
|
2500
|
1100
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Double-row Steel Ball
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50Mn
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Combined Seal (Rubber + Metal)
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Grease + Periodic Oil Injection
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Medium-tonnage cranes, ship unloaders
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168
|
|
|
022.30.800
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800
|
1060
|
80
|
3200
|
1450
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Double-row Steel Ball
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50Mn
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Combined Seal (Rubber + Metal)
|
Grease + Periodic Oil Injection
|
Large cranes, wind turbine yaw systems
|
245
|
|
|
022.30.1000
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1000
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1320
|
95
|
4500
|
2000
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Double-row Steel Ball
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50Mn
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Combined Seal (Rubber + Metal)
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Grease + Periodic Oil Injection
|
Wind turbine pitch systems, mining machinery
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380
|
|
Three-row Roller Slewing Ring
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131.40.1000
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1000
|
1400
|
105
|
6500
|
2800
|
Three-row Roller
|
42CrMo
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Special Dust Seal + Oil Seal
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Centralized Lubrication System
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Heavy-duty excavators, tunnel boring machines
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520
|
|
|
131.40.1200
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1200
|
1600
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120
|
8000
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3500
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Three-row Roller
|
42CrMo
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Special Dust Seal + Oil Seal
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Centralized Lubrication System
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Offshore platforms, metallurgical equipment
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750
|
|
|
131.40.1500
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1500
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1950
|
140
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12000
|
5000
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Three-row Roller
|
42CrMo
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Special Dust Seal + Oil Seal
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Centralized Lubrication System
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Super heavy-duty machinery, large ship cranes
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1280
|
|
Ball-Roller Combined Slewing Ring
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031.35.630
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630
|
880
|
85
|
3000
|
1300
|
Ball + Roller
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42CrMo
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Double Lip Rubber Seal + Metal Dust Cover
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Lithium-based Grease + Periodic Oil Injection
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Mixed load machinery, port container cranes
|
210
|
|
|
031.35.800
|
800
|
1100
|
95
|
4200
|
1800
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Ball + Roller
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42CrMo
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Double Lip Rubber Seal + Metal Dust Cover
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Lithium-based Grease + Periodic Oil Injection
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Large-scale stacking machines, heavy-duty transfer equipment
|
320
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Stack Specialization Architecture
Our triple-row arrangement disseminates loads over committed roller sets. Two pivotal roller lines handle bidirectional pushed loads and tilting minutes, whereas the outspread roller push assimilates sidelong strengths. This partition disposes of stack impedances and maximizes bearing efficiency.
90° Crossed Arrangement
The round and hollow rollers in hub columns utilize a 90° substituting design, guaranteeing full line contact with raceways. This plan upgrades basic unbending nature and minimizes versatile misshapening beneath overwhelming operational loads.
Multi-Ring Construction
The three-ring structure (inward, external, and middle rings) gives devoted raceways for each roller push. This coordinates approach diminishes establishment complexity whereas keeping up exact stack ways all through the bearing assembly.
High Unbending nature Performance
Line contact between rollers and raceways conveys uncommon auxiliary inflexibility compared to ball-type choices. Accuracy grades accomplish runout resiliences ≤0.02mm with negligible backfire for exact situating control.

Construction Industry Applications
Tower cranes prepared with our slewing heading back high-rise building development, bridge establishment, and framework improvement ventures. The bearing's smooth rotational capability empowers exact fabric situating and improved development efficiency.
Heavy-Duty Stack Handling
The bearing plan obliges extraordinary stack combinations normal in tower crane operations. Whether dealing with auxiliary steel situation or concrete pouring exercises, our Tower Crane Slewing Bearing keeps up operational solidness beneath shifting stack conditions.
Extended Benefit Requirements
Construction ventures frequently require ceaseless crane operation over expanded periods. Our orientation join progressed oil frameworks and wear-resistant materials to bolster long benefit interims with negligible upkeep requirements.
Material Determination and Warm Treatment
We utilize high-purity bearing steel with specialized warm treatment forms counting carburizing and extinguishing. This combination conveys prevalent wear resistance and weariness quality for requesting tower crane applications.
Precision Fabricating Process
Our generation offices keep up strict dimensional resistances through exactness crushing and machining operations. Each bearing experiences comprehensive testing counting vibration investigation and stack confirmation some time recently shipment.
Three-Level Quality System
Our quality control handle includes crude fabric review, in-process observing, and wrapped up item confirmation. We test 12 center execution markers to guarantee steady quality benchmarks with >99.9% capability rates.
Integrated Oil System
Circumferential oil grooves and deliberately situated oil areolas encourage schedule upkeep methods. Pre-lubricated fixed variations amplify benefit interims whereas diminishing operational downtime.
Sealing Protection
Double-lip fixing frameworks ensure inside components from defilement whereas holding oil. This plan guarantees solid execution in dusty development situations with negligible support intervention.
Monitoring Capabilities
Optional sensor integration bolsters condition observing for prescient upkeep programs. Temperature and vibration checking offer assistance optimize support plans and anticipate unforeseen failures.
Global Specialized Bolster Network
Our experienced designing group gives around the world specialized help for bearing determination, establishment direction, and operational investigating. We offer on-site mapping administrations for substitution applications and custom adjustment requirements.
Comprehensive Arrangement Approach
Beyond bearing supply, we give total rotational arrangements counting adapt integration alternatives, mounting equipment suggestions, and establishment strategies. This approach guarantees ideal bearing execution inside your particular tower crane configuration.
Efficient Conveyance System
With over 1,000 standard bearing sorts in stock, we convey normal orders inside 48 hours. Custom item arrangements are completed in 70% of industry-standard timeframes through optimized generation processes.

Our 30 a long time of bearing industry involvement interprets into demonstrated unwavering quality for basic applications. We combine progressed fabricating capabilities with comprehensive specialized bolster to provide arrangements that meet your particular operational requirements.
Our coordinates approach covers the total bearing lifecycle from introductory determination through long-term support back. This guarantees ideal execution and cost-effectiveness all through your equipment's benefit life.
For technical consultation or custom Tower Crane Slewing Bearing requirements, contact our engineering team at auto@lyautobearing.com. We provide detailed application analysis and recommend optimal solutions for your specific tower crane configuration.
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