INDUSTRY COMPONENT

Bearing Bore

Precision-machined cylindrical bore in aluminum housing for bearing installation and support

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Component Specifications

Definition
A bearing bore is a precisely machined cylindrical cavity within an aluminum CNC machined bearing housing designed to accommodate and secure rolling element bearings (such as ball bearings or roller bearings). This component ensures accurate radial and axial positioning of the bearing, maintains proper clearance fits (typically H7 or similar tolerance grades), and provides structural support to handle operational loads while facilitating efficient heat dissipation and lubrication management in rotating machinery systems.
Working Principle
The bearing bore functions by providing a rigid, dimensionally stable interface that precisely locates the bearing outer race. It maintains interference or clearance fits as specified to prevent bearing creep under load while allowing for thermal expansion. The bore's surface finish and geometric accuracy (roundness, cylindricity) ensure even load distribution, minimize vibration, and extend bearing service life by reducing stress concentrations and misalignment.
Materials
Aluminum alloy (typically 6061-T6 or 7075-T6), with optional anodizing or hard coating for wear resistance. Material specifications include: density 2.7 g/cm³, tensile strength 310 MPa (6061-T6) or 572 MPa (7075-T6), thermal conductivity 167 W/m·K, and hardness 95 HB (6061-T6) or 150 HB (7075-T6).
Technical Parameters
  • Chamfer 0.5×45°
  • Surface finish Ra 0.8-1.6 μm
  • Depth tolerance ±0.05 mm
  • Diameter tolerance H7 (ISO)
  • Roundness tolerance 0.005 mm
  • Cylindricity tolerance 0.008 mm
  • Operating temperature range -20°C to +150°C
  • Maximum radial load capacity Depends on housing design (typically 5-20 kN)
Standards
ISO 286-2, ISO 1101, DIN 7154, DIN 7182

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Bearing Bore.

bearing bore aluminum CNC housing precision machining bearing fit H7 tolerance ISO standards bearing installation machining tolerances industrial components Bearing Bore in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Aluminum CNC Machined Bearing Housing

Precision aluminum housing for mounting and protecting bearings

View Product Details

Pivot Bearing Housing

A structural component that houses and supports the pivot bearing within a guiding roller assembly.

View Product Details

Transmission Housing

The protective outer casing that encloses and supports the internal components of a transmission system.

View Product Details

Engineering Analysis

Risks & Mitigation
  • Bearing creep due to improper fit
  • Thermal expansion mismatch
  • Corrosion in harsh environments
  • Fatigue cracking under cyclic loads
  • Geometric inaccuracies causing premature bearing failure
FMEA Triads
Trigger: Insufficient interference fit or improper tolerance selection
Failure: Bearing outer race rotates within housing (bearing creep), leading to fretting corrosion, heat generation, and eventual catastrophic failure
Mitigation: Implement proper tolerance selection (H7 for clearance, P7 for interference), verify fit with go/no-go gauges, apply retaining compounds for critical applications
Trigger: Poor surface finish or geometric inaccuracies (out-of-round, taper)
Failure: Uneven load distribution on bearing, increased vibration, reduced bearing life, excessive heat generation
Mitigation: Implement strict quality control for surface finish (Ra ≤ 1.6 μm) and geometric tolerances (roundness ≤ 0.005 mm), use precision boring tools with proper tool maintenance
Trigger: Thermal expansion mismatch between aluminum housing and steel bearing
Failure: Fit changes during operation, leading to either excessive clearance or interference, causing bearing seizure or excessive play
Mitigation: Calculate thermal expansion coefficients for operating temperature range, design for worst-case scenarios, consider bearing materials with compatible expansion rates

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
H7 per ISO 286-2 for diameters up to 500 mm, geometric tolerances per ISO 1101
Test Method
CMM verification of diameter, roundness, and cylindricity; surface roughness testing per ISO 4287; functional testing with bearing installation and rotation under load

Buyer Feedback

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Frequently Asked Questions

What is the standard tolerance for bearing bores in aluminum housings?

The most common tolerance is H7 according to ISO 286-2, which provides a clearance fit for most bearing applications, typically ranging from +0.000 mm to +0.025 mm for a 50 mm bore.

Why is surface finish important for bearing bores?

Proper surface finish (typically Ra 0.8-1.6 μm) ensures even load distribution, prevents premature bearing wear, reduces friction heat generation, and maintains lubrication film integrity.

Can bearing bores be repaired if damaged?

Minor damage can be repaired using precision boring and sleeving techniques, but significant damage usually requires housing replacement to maintain dimensional accuracy and load capacity.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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