Cage/Spacer: Load Capacity Up to 1000 kN, Thickness 2-20 mm

Component Specifications

Definition

The Cage/Spacer is a critical structural element within slewing ring bearings, designed to precisely separate and position rolling elements (balls or rollers) at uniform intervals around the bearing raceway. This component prevents direct contact between rolling elements, reduces friction and wear, ensures even load distribution across all elements, maintains alignment during operation, and facilitates proper lubrication flow. In industrial applications, it enhances bearing stability, extends service life, and supports high radial/axial loads in rotating machinery.

Working Principle

The Cage/Spacer operates by physically separating rolling elements within the bearing assembly to maintain consistent spacing. This prevents element-to-element contact that could cause friction, heat buildup, or premature wear. During rotation, it guides the rolling elements along the raceway, ensuring smooth motion and optimal load transfer. The design accommodates thermal expansion and mechanical stresses while preserving alignment, contributing to efficient energy transmission and reduced vibration in machinery.

Materials

Typically made from high-strength steel (e.g., AISI 52100, case-hardened), brass, or engineered polymers (e.g., polyamide, PEEK) for corrosion resistance and durability. Material selection depends on load capacity, speed, temperature range (-40°C to 120°C for polymers, higher for metals), and environmental conditions (e.g., moisture, chemicals).

Technical Parameters

Parameter	Typical range	Notes & selection driver
Hardness	55-65 HRC for steel
Thickness	2-20 mm
Load Capacity	Up to 1000 kN
Diameter Range	50-5000 mm
Weight Tolerance	±0.5%
Operating Temperature	-50°C to 200°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 1132-1, DIN 5412

Parent Products

This component is used in the following industrial products

Slewing Ring Bearing

A large-diameter bearing that supports axial, radial, and moment loads while enabling rotational movement between two structures.

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Engineering Analysis

Risks & Mitigation

Misalignment due to improper installation
Fatigue failure under cyclic loads
Corrosion in harsh environments
Thermal expansion mismatch

FMEA Triads

Trigger: Inadequate lubrication
Failure: Increased friction and wear leading to cage deformation
Mitigation: Implement regular lubrication schedules and use compatible greases/oils.

Trigger: Excessive load or shock
Failure: Cage fracture or rolling element jamming
Mitigation: Design with safety factors, conduct load testing, and install overload protection devices.

Industrial Ecosystem

Compatible With

Slewing ring bearings in cranes, excavators, wind turbines, robotics

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1 mm dimensional accuracy per ISO standards

Test Method

Dimensional inspection, hardness testing, fatigue life testing under simulated loads

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

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Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Cage/Spacer

Manufacturer profiles associated with Cage/Spacer.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the primary function of a Cage/Spacer in a slewing ring bearing?

It maintains uniform spacing between rolling elements to prevent contact, reduce friction, ensure even load distribution, and enhance bearing longevity.

How do material choices affect Cage/Spacer performance?

Steel offers high strength for heavy loads, brass provides corrosion resistance, and polymers reduce weight and noise, with selection based on operational demands like temperature and speed.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

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.

Cage/Spacer