Structured Manufacturing Data (2026)

Slewing Bearing (Ring)

Based on aggregated insights from structured 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 Part
    Precision-machined groove or track that guides and supports the rolling elements (balls or rollers).
    Material: Hardened Alloy Steel
  • Mounting Holes Part
    Bolt holes or threaded holes for securing the ring to adjacent structures (e.g., chassis, turntable).
    Material: Alloy Steel
  • Sealing Groove Part
    Groove designed to accommodate seals that protect the internal bearing components from contaminants.
    Material: Alloy Steel
  • Gear Teeth (if applicable) Part
    Integrated internal or external gear teeth for direct drive engagement in motorized slewing systems.
    Material: Hardened Alloy Steel

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 Structure

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)

Manufacturer profiles with relevant production capability in China

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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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 basis: CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks for Machinery and Equipment Manufacturing.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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