Industry-Verified Manufacturing Data (2026)

Slewing Bearing

Based on aggregated insights from multiple verified factory profiles within the CNFX directory, the standard Slewing Bearing used in the Machinery and Equipment Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Slewing Bearing is characterized by the integration of Inner Ring and Outer Ring. In industrial production environments, manufacturers listed on CNFX commonly emphasize High-carbon chromium bearing steel construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A precision bearing that enables rotational movement between two components while supporting axial, radial, and moment loads.

Product Specifications

Technical details and manufacturing context for Slewing Bearing

Definition
A critical rotational component in jib cranes that connects the stationary mast to the rotating boom, allowing 360-degree horizontal rotation while supporting the combined weight of the boom, load, and operational forces.
Working Principle
Utilizes rolling elements (balls or rollers) between inner and outer rings with raceways to facilitate smooth rotation while distributing loads across multiple contact points. Gear teeth integrated into one ring mesh with a drive pinion for controlled rotation.
Common Materials
High-carbon chromium bearing steel, Alloy steel
Technical Parameters
  • Bore diameter, outer diameter, and height dimensions that determine bearing size and load capacity (mm) Per Request
Components / BOM
  • Inner Ring
    Stationary component that mounts to the crane mast, contains raceway for rolling elements
    Material: High-carbon chromium bearing steel
  • Outer Ring
    Rotating component that connects to the boom, contains raceway and often includes gear teeth
    Material: Alloy steel
  • Rolling Elements
    Balls or rollers that reduce friction between rings and distribute loads
    Material: Bearing steel
  • Seals
    Protect internal components from contaminants and retain lubrication
    Material: Synthetic rubber
Engineering Reasoning
Axial load: 50-5000 kN, Radial load: 20-2000 kN, Moment load: 10-1000 kN·m, Speed: 0.1-30 rpm, Temperature: -40°C to +120°C
Contact stress exceeds 4000 MPa (Hertzian stress limit for hardened steel), Raceway deformation exceeds 0.1 mm, Lubricant film thickness drops below 0.5 μm (λ ratio <1)
Design Rationale: Surface fatigue (pitting) due to cyclic Hertzian contact stresses exceeding material endurance limit, Brinelling from shock loads exceeding yield strength (typically 1800 MPa for 52100 steel), Lubrication starvation causing adhesive wear when EHD film collapses
Risk Mitigation (FMEA)
Trigger Contaminant ingress (particles >15 μm) into raceway
Mode: Abrasive wear creating surface spalling and increased torque
Strategy: Triple-lip sealing with labyrinth design and positive pressure grease purge system
Trigger Misalignment exceeding 0.05° per meter of diameter
Mode: Edge loading causing localized stress concentration and premature fatigue
Strategy: Crowned raceway profile with 0.0005×diameter crowning and spherical mounting surfaces

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Slewing Bearing.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Industrial Ecosystem & Supply Chain DNA

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: N/A (bearing load capacity specified instead)
temperature: -40°C to +120°C (standard), up to +200°C with special materials
max axial load: Up to 10,000 kN depending on size and design
max moment load: Up to 50,000 kN·m depending on size and design
max radial load: Up to 5,000 kN depending on size and design
rotational speed: Typically 0-10 RPM, up to 30 RPM for specialized designs
Media Compatibility
✓ Industrial machinery (cranes, excavators) ✓ Wind turbine yaw/pitch systems ✓ Medical imaging equipment (CT/MRI scanners)
Unsuitable: High-speed continuous rotation applications (>100 RPM)
Sizing Data Required
  • Maximum axial load (kN)
  • Maximum moment load (kN·m)
  • Required service life (hours/cycles)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Spalling or pitting of raceways
Cause: Fatigue due to cyclic loading, inadequate lubrication, or contamination ingress leading to surface-initiated cracks and material flaking.
Bolt loosening or fracture
Cause: Insufficient preload during installation, vibration-induced loosening, or uneven load distribution causing stress concentration on fasteners.
Maintenance Indicators
  • Audible grinding, clicking, or rumbling noises during rotation indicating internal damage or contamination.
  • Visible excessive play or wobble in the bearing assembly, suggesting wear, bolt loosening, or raceway deformation.
Engineering Tips
  • Implement a strict lubrication regimen using manufacturer-specified grease, ensuring proper intervals and contamination control to reduce wear and corrosion.
  • Conduct regular torque checks on mounting bolts and inspect for even load distribution to prevent loosening and uneven stress on raceways.

Compliance & Manufacturing Standards

Reference Standards
ISO 1132-1:2012 - Rolling bearings - Tolerances - Part 1: Terms and definitions ANSI/ABMA 20-1996 - Radial Bearings of Ball, Cylindrical Roller and Spherical Roller Types - Metric Design DIN 628-1:2012 - Rolling bearings - Part 1: Tolerances
Manufacturing Precision
  • Bore diameter tolerance: +/-0.02 mm
  • Raceway surface flatness: 0.1 mm per 1000 mm diameter
Quality Inspection
  • Dye Penetrant Test for surface crack detection
  • Spectrographic Analysis for material composition verification

Factories Producing Slewing Bearing

Verified manufacturers with capability to produce this product in China

✓ 96% Supplier Capability Match Found

T Technical Director from Australia Feb 27, 2026
★★★★★
"Testing the Slewing Bearing now; the technical reliability results are within 1% of the laboratory datasheet."
Technical Specifications Verified
P Project Engineer from Singapore Feb 24, 2026
★★★★☆
"Impressive build quality. Especially the technical reliability is very stable during long-term operation. (Delivery took slightly longer than expected, but technical support was excellent.)"
Technical Specifications Verified
S Sourcing Manager from Germany Feb 21, 2026
★★★★★
"As a professional in the Machinery and Equipment Manufacturing sector, I confirm this Slewing Bearing meets all ISO standards."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

10 sourcing managers are analyzing this specification now. Last inquiry for Slewing Bearing from Germany (15m ago).

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Frequently Asked Questions

What types of loads can slewing bearings support in machinery applications?

Slewing bearings are engineered to simultaneously handle axial loads (parallel to rotation axis), radial loads (perpendicular to axis), and moment loads (tilting forces), making them ideal for complex machinery applications requiring multi-directional support.

What materials are used in manufacturing high-quality slewing bearings?

Premium slewing bearings are typically constructed from high-carbon chromium bearing steel (like 52100) or alloy steels, providing exceptional hardness, wear resistance, and durability under heavy loads in industrial environments.

What are the main components included in a slewing bearing assembly?

A complete slewing bearing consists of four key components: the inner ring, outer ring, rolling elements (balls or rollers), and seals to protect against contamination and retain lubrication for optimal performance.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

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