Industry-Verified Manufacturing Data (2026)

Slewing Bearing (Ring)

Based on aggregated insights from multiple verified factory profiles within the CNFX directory, the standard Slewing Bearing (Ring) 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 (Ring) is characterized by the integration of Raceway and Mounting Holes. In industrial production environments, manufacturers listed on CNFX commonly emphasize Alloy Steel (e.g., 42CrMo4, 50Mn) construction to support stable, high-cycle operation across diverse manufacturing scenarios.

The stationary or rotating ring component of a slewing bearing that provides the raceway for rolling elements.

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Product Specifications

Technical details and manufacturing context for Slewing Bearing (Ring)

Definition
The ring is a critical structural component of a slewing bearing, forming the inner or outer raceway that guides and supports the rolling elements (balls or rollers). It is designed to withstand high axial, radial, and moment loads while enabling smooth rotational motion between connected structures in heavy machinery.
Working Principle
The ring provides a hardened, precision-machined raceway. When integrated with rolling elements and a mating ring, it forms a low-friction bearing interface. Loads are transferred from the connected structure through the ring, distributed across the rolling elements, and transmitted to the opposing ring and its mounting structure.
Common Materials
Alloy Steel (e.g., 42CrMo4, 50Mn)
Technical Parameters
  • Ring diameter (bore or outside diameter), defining the bearing's size and load capacity. (mm) Standard Spec
Components / BOM
  • Raceway
    Precision-machined groove or track that guides and supports the rolling elements (balls or rollers).
    Material: Hardened Alloy Steel
  • Mounting Holes
    Bolt holes or threaded holes for securing the ring to adjacent structures (e.g., chassis, turntable).
    Material: Alloy Steel
  • Sealing Groove
    Groove designed to accommodate seals that protect the internal bearing components from contaminants.
    Material: Alloy Steel
  • Gear Teeth (if applicable)
    Integrated internal or external gear teeth for direct drive engagement in motorized slewing systems.
    Material: Hardened Alloy Steel
Engineering Reasoning
Contact stress 1500-2500 MPa, rotational speed 0.1-30 rpm, axial load 50-5000 kN, radial load 20-2000 kN
Hertzian contact stress exceeding 3000 MPa causes plastic deformation, Brinell hardness drop below 300 HB initiates spalling
Design Rationale: Subsurface shear stress exceeding material yield strength (τ_max > 0.3σ_y) initiates fatigue cracks at 45° to surface following Lundberg-Palmgren theory
Risk Mitigation (FMEA)
Trigger Contaminant particle >15 μm diameter entering raceway
Mode: Indentation-induced stress concentration exceeding 2.5× nominal contact stress
Strategy: Triple-labyrinth seal with 0.05 mm clearance and positive pressure grease purge at 0.2 bar
Trigger Misalignment exceeding 0.001 rad causing edge loading
Mode: Stress concentration factor of 3.2 at raceway edge, localized temperature rise to 150°C
Strategy: Spherical seat mounting with 0.5° angular compensation and laser-aligned installation to 0.0005 rad tolerance

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Slewing Bearing (Ring).

Slewing Ring alloy steel slewing bearing ring slewing bearing ring with gear teeth 42CrMo4 slewing bearing component precision raceway bearing ring heavy machinery bearing ring

Applied To / Applications

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

Slewing Bearing & Drive
View system integration details

Industrial Ecosystem & Supply Chain DNA

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Max contact pressure: 4000-6000 MPa (depending on material and heat treatment)
other spec: Max rotational speed: 50-100 rpm (depending on size and lubrication), Load capacity: Static 100-5000 kN, Dynamic 50-2500 kN
temperature: -40°C to +120°C (standard), up to +200°C with special materials
Media Compatibility
✓ Industrial machinery (cranes, excavators) ✓ Wind turbine yaw/pitch systems ✓ Medical imaging equipment (CT/MRI rotating rings)
Unsuitable: High-corrosion marine splash zones without protective coatings
Sizing Data Required
  • Axial/radial/moment load combinations (kN)
  • Required service life (operating hours/cycles)
  • Mounting configuration and space constraints (bore diameter, overall height)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Spalling and Brinelling
Cause: Fatigue from cyclic loading, shock loads, or improper mounting leading to surface material flaking and permanent deformation
Corrosion and Lubrication Failure
Cause: Inadequate sealing allowing moisture/contaminant ingress, improper lubricant selection, or insufficient lubrication intervals causing wear and seizure
Maintenance Indicators
  • Audible grinding, clicking, or rumbling noises during rotation indicating bearing damage or contamination
  • Visible excessive play or wobble in the rotating structure, or leakage/discoloration of lubricant from seals
Engineering Tips
  • Implement precision alignment during installation and periodic checks to prevent uneven loading and edge loading that accelerates fatigue
  • Establish a proactive lubrication regime with manufacturer-recommended grease types and intervals, using proper sealing systems and contamination exclusion methods

Compliance & Manufacturing Standards

Reference Standards
ISO 1132-1:2000 - Rolling bearings - Tolerances - Part 1: Terms and definitions ANSI/ABMA 7-1995 - Shaft and Housing Fits for Metric Radial Ball and Roller Bearings (Except Tapered Roller Bearings) Conforming to Basic Boundary Plans DIN 5412-1:2016-12 - Rolling bearings - Slewing bearings - Part 1: General principles
Manufacturing Precision
  • Bore diameter tolerance: H7 (e.g., +0.025mm to 0mm for 100mm bore)
  • Raceway runout tolerance: ≤0.05mm per 100mm diameter
Quality Inspection
  • Ultrasonic Testing (UT) for internal defects in raceways and rolling elements
  • Hardness Testing (Rockwell C scale) on raceway surfaces to verify heat treatment quality

Factories Producing Slewing Bearing (Ring)

Verified manufacturers with capability to produce this product in China

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✓ 98% Supplier Capability Match Found

P Procurement Specialist from Singapore Jan 11, 2026
★★★★★
"The technical documentation for this Slewing Bearing (Ring) is very thorough, especially regarding technical reliability."
Technical Specifications Verified
T Technical Director from Germany Jan 08, 2026
★★★★★
"Reliable performance in harsh Machinery and Equipment Manufacturing environments. No issues with the Slewing Bearing (Ring) so far."
Technical Specifications Verified
P Project Engineer from Brazil Jan 05, 2026
★★★★★
"Testing the Slewing Bearing (Ring) now; the technical reliability results are within 1% of the laboratory datasheet."
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.”

12 sourcing managers are analyzing this specification now. Last inquiry for Slewing Bearing (Ring) from Thailand (1h ago).

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Frequently Asked Questions

What materials are commonly used for slewing bearing rings?

Slewing bearing rings are typically manufactured from high-strength alloy steels such as 42CrMo4 or 50Mn, which provide excellent durability and load-bearing capacity for industrial applications.

What are the key components of a slewing bearing ring?

Key components include the raceway for rolling elements, mounting holes for secure installation, sealing grooves for protection, and optional gear teeth for rotational drive systems in machinery.

How do I select the right slewing bearing ring for my equipment?

Consider load capacity requirements, rotational speed, environmental conditions, and whether you need integrated gear teeth. Consult specifications for materials like 42CrMo4 or 50Mn steel based on your application's demands.

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.

Data Specifications verified by CNFX Industrial Index (v2.6.03) for Machinery and Equipment Manufacturing sector.

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