INDUSTRY COMPONENT

Inner Race

Precision inner race component for computer cooling fan bearings that rotates with the shaft to enable smooth fan operation.

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Component Specifications

Definition
The inner race is the inner ring of a rolling-element bearing in computer cooling fan assemblies that rotates with the shaft, providing a hardened, precision-ground surface for ball or roller contact. It serves as the rotating interface between the shaft and bearing assembly, maintaining concentricity while minimizing friction and wear through controlled clearance and surface finish specifications.
Working Principle
The inner race rotates with the fan shaft while maintaining precise clearance with rolling elements (balls or rollers) to convert rotational motion into smooth fan blade movement with minimal friction. Its hardened surface and geometric accuracy ensure consistent load distribution and rotational stability.
Materials
High-carbon chromium steel (AISI 52100/SUJ2), case-hardened steel, or ceramic composites; Hardness: 58-65 HRC; Surface finish: Ra 0.1-0.4 μm
Technical Parameters
  • Width 2-6 mm
  • Inner Diameter 2-8 mm
  • Outer Diameter 5-15 mm
  • Radial Clearance 0.002-0.015 mm
  • Surface Roughness Ra ≤0.2 μm
  • Concentricity Tolerance ≤0.003 mm
  • Raceway Curvature Radius 51-53% of ball diameter
Standards
ISO 15, ISO 492, DIN 625-1, ABEC 5/7

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Inner Race.

bearing inner race fan bearing component computer cooling fan parts precision bearing rings miniature bearing components Inner Race Inner Race in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

Computer Cooling Fan Bearing Assembly

Precision bearing assembly for computer cooling fan motors.

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Precision bearing supporting compression rollers in pharmaceutical tablet presses

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Bearing Assembly

A mechanical assembly within a furniture hinge that facilitates smooth rotational movement and reduces friction between moving parts.

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Engineering Analysis

Risks & Mitigation
  • Micro-pitting from insufficient lubrication
  • Brinnelling from shock loads
  • Corrosion in humid environments
  • Geometric deformation from improper installation
FMEA Triads
Trigger: Inadequate lubrication or contaminated lubricant
Failure: Accelerated wear and overheating
Mitigation: Implement automated lubrication systems with filtration; Use sealed bearing designs
Trigger: Improper press-fit installation causing distortion
Failure: Increased vibration and reduced lifespan
Mitigation: Use precision installation tools with force monitoring; Apply thermal fitting methods
Trigger: Material impurities or heat treatment inconsistencies
Failure: Premature cracking or spalling
Mitigation: Implement 100% material certification; Use statistical process control in heat treatment

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
ABEC 5 or higher precision class; Radial runout ≤0.003 mm; Diameter tolerance: h5/h6
Test Method
Coordinate measuring machine (CMM) verification; Surface roughness testing; Hardness testing (Rockwell C); Accelerated life testing per ISO 281

Buyer Feedback

★★★★☆ 4.5 / 5.0 (14 reviews)

"Testing the Inner Race now; the technical reliability results are within 1% of the laboratory datasheet."

"Impressive build quality. Especially the technical reliability is very stable during long-term operation."

"As a professional in the Computer, Electronic and Optical Product Manufacturing sector, I confirm this Inner Race meets all ISO standards."

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Frequently Asked Questions

What is the primary function of the inner race in cooling fan bearings?

The inner race provides the rotating interface between the fan shaft and rolling elements, maintaining precise clearance for smooth rotation while distributing mechanical loads evenly across the bearing assembly.

Why is material hardness critical for inner race components?

High hardness (58-65 HRC) prevents deformation under rotational loads, reduces wear from continuous ball/roller contact, and extends bearing lifespan in high-RPM cooling fan applications.

What happens if radial clearance specifications are not maintained?

Excessive clearance causes vibration and noise, while insufficient clearance generates heat through friction, both leading to premature bearing failure and reduced fan efficiency.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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