Inner raceway: Load Capacity Up to 500 kN axial

Component Specifications

Definition

The inner raceway is a critical component of thrust bearings, featuring a precisely machined grooved or flat surface that interfaces with rolling elements (balls or rollers) to accommodate axial loads parallel to the shaft axis. It is typically mounted on the rotating shaft and works in conjunction with the outer raceway to distribute forces, minimize friction, and maintain alignment in high-load applications such as automotive transmissions, industrial gearboxes, and heavy machinery.

Working Principle

The inner raceway operates by providing a smooth, hardened track for rolling elements to rotate against under axial load. As the shaft rotates, the raceway transfers axial forces from the rotating assembly to the stationary housing through the rolling elements, reducing sliding friction through rolling contact. The geometry (groove angle, curvature) is engineered to optimize load distribution and prevent stress concentration.

Materials

Typically made from high-carbon chromium steel (AISI 52100/SUJ2) or case-hardened steel (AISI 8620), heat-treated to 58-64 HRC for wear resistance. Alternative materials include stainless steel (440C) for corrosion resistance or ceramic for high-speed applications.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Hardness	58-64 HRC
Load Capacity	Up to 500 kN axial
Diameter Range	10-500 mm
Surface Finish	Ra 0.2-0.8 μm
Dimensional Tolerance	IT5-IT7

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 199, DIN 711

Parent Products

This component is used in the following industrial products

Thrust Bearing

A specialized bearing designed to handle axial loads parallel to the shaft axis.

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Engineering Analysis

Risks & Mitigation

Surface pitting from fatigue
Brinelling from shock loads
Corrosion in harsh environments
Geometric inaccuracies causing misalignment

FMEA Triads

Trigger: Insufficient hardness or material defects
Failure: Premature wear or spalling
Mitigation: Implement strict material certification and heat treatment controls

Trigger: Improper installation or excessive preload
Failure: Raceway cracking or brinelling
Mitigation: Follow manufacturer torque specifications and use proper mounting tools

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

ISO 199 specifies dimensional and geometric tolerances for bearing rings

Test Method

Hardness testing (Rockwell C), surface roughness measurement, dimensional inspection with CMM

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

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

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

Supplier transparency

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Manufacturers of Inner raceway

Manufacturer profiles associated with Inner raceway.

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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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Seal Groove

Precision-machined groove in aluminum bearing housings designed to accommodate sealing elements for fluid containment and contamination prevention.

Frequently Asked Questions

What is the difference between inner and outer raceways in thrust bearings?

The inner raceway mounts on the rotating shaft and moves with it, while the outer raceway is stationary in the housing. Both work together to guide rolling elements under axial load.

How does raceway geometry affect bearing performance?

Geometry (like groove curvature) determines load distribution, contact stress, and fatigue life. Optimal design reduces stress concentration and improves durability.

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.

Inner raceway