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Bore / Raceway Component – Machinery and Equipment Manufacturing

Component Specifications

Definition

The bore/raceway is a critical precision-engineered component within linear guides and bearing housings, consisting of precisely machined cylindrical surfaces that serve as the contact interface for rolling elements (balls or rollers). These surfaces are designed with specific geometric tolerances, surface finishes, and hardness characteristics to minimize friction, distribute loads evenly, and maintain alignment during linear motion. The bore provides the mounting surface for the shaft or rail, while the raceway guides the rolling elements along a controlled path, ensuring consistent motion accuracy and load capacity.

Working Principle

The bore/raceway operates on the principle of rolling contact mechanics, where precision-ground surfaces reduce sliding friction by allowing rolling elements to travel along a defined path. The geometry of the raceway controls the contact angle and preload, optimizing load distribution and minimizing deformation under operational stresses. This design converts rotational or linear input into smooth, guided linear motion with minimal energy loss.

Materials

Typically made from high-carbon chromium bearing steel (e.g., AISI 52100/SUJ2), case-hardened steel (e.g., AISI 8620), or stainless steel (e.g., AISI 440C). Surface hardness ranges from 58-64 HRC, with core toughness maintained at 30-45 HRC. Optional coatings include black oxide, zinc-nickel plating, or titanium nitride for corrosion resistance and reduced wear.

Technical Parameters

Hardness 58-64 HRC
Temperature Range -30°C to +120°C
Roundness Tolerance ≤ 0.005 mm
Straightness Tolerance ≤ 0.01 mm/m
Bore Diameter Tolerance H6/H7 (ISO)
Load Capacity (Dynamic) 10-50 kN (varies by size)
Raceway Surface Roughness Ra 0.2-0.4 μm

Standards

ISO 14728, DIN 645, JIS B 1192

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Bore / Raceway.

Parent Products

This component is used in the following industrial products

Linear Guide / Bearing Housing

A structural component that houses and supports linear bearings or guide rails, providing precise linear motion guidance within mechanical systems.

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Engineering Analysis

Risks & Mitigation

Surface wear from contamination
Corrosion in humid environments
Geometric deformation under overload
Misalignment during installation

FMEA Triads

Trigger: Contaminant ingress (dust, chips)
Failure: Abrasive wear on raceway surfaces, increased friction, reduced accuracy
Mitigation: Install seals or wipers, use closed housings, implement regular cleaning protocols

Trigger: Improper lubrication
Failure: Increased friction, overheating, premature wear or seizure
Mitigation: Follow manufacturer lubrication intervals, use compatible greases, monitor temperature

Trigger: Excessive load or shock
Failure: Raceway brinelling, permanent deformation, loss of precision
Mitigation: Design within load ratings, use shock absorbers, implement load monitoring systems

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

Geometric tolerances per ISO 1101:2017; bore diameter tolerance H6/H7 per ISO 286-2

Test Method

Coordinate measuring machine (CMM) for geometry; surface roughness tester per ISO 4287; hardness testing per ISO 6508-1; load testing per ISO 14728

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

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 is the difference between bore and raceway in linear guides?

The bore is the cylindrical mounting surface for the shaft or rail, ensuring proper fit and alignment. The raceway is the precisely ground track where rolling elements (balls/rollers) travel, controlling motion path and load distribution.

How does raceway geometry affect linear guide performance?

Raceway geometry (e.g., Gothic arch or circular arc) determines contact angle, load distribution, and stiffness. Optimal geometry reduces stress concentration, minimizes friction, and enhances accuracy and lifespan.

What maintenance is required for bore/raceway components?

Regular cleaning to remove contaminants, lubrication with appropriate greases (e.g., lithium-based), and inspection for wear, pitting, or corrosion. Avoid abrasive cleaners and ensure proper alignment during installation.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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.

Bore / Raceway