INDUSTRY COMPONENT

Bearing housing bore

Precision-machined cylindrical bore in bearing housing for shaft support and alignment

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Component Specifications

Definition
A bearing housing bore is a precisely machined cylindrical opening within a bearing block or housing that accommodates and supports rolling element bearings (ball, roller, or tapered bearings). Its primary function is to provide accurate radial and axial positioning of the bearing outer ring, ensuring proper shaft alignment, load distribution, and rotational stability in mechanical systems. The bore's dimensional accuracy, surface finish, and geometric tolerances directly impact bearing performance, lifespan, and system reliability.
Working Principle
The bearing housing bore operates on the principle of interference or clearance fit with the bearing outer ring. It constrains the bearing radially and axially while transferring operational loads (radial, axial, and moment loads) from the rotating shaft through the bearing to the stationary machine structure. Proper bore geometry ensures even load distribution across the bearing raceway, minimizes stress concentrations, and maintains lubrication integrity within the bearing assembly.
Materials
Typically manufactured from cast iron (GGG40, GGG50), ductile iron, cast steel (GS-52, G20Mn5), or aluminum alloys (AlSi10Mg, A356). Material selection depends on load capacity, thermal expansion requirements, corrosion resistance, and machining characteristics.
Technical Parameters
  • Hardness 160-240 HB for cast iron, 140-190 HB for aluminum
  • Cylindricity 0.01-0.03 mm per 100 mm length
  • Surface Roughness Ra 1.6-3.2 μm (63-125 μin)
  • Roundness Tolerance IT6-IT7 grade
  • Bore Diameter Tolerance H7 (ISO) or H6 for precision applications
Standards
ISO 286-2, ISO 1101, DIN 7190, DIN 3760

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Bearing housing bore.

bearing housing bore bearing block bore shaft support precision machining bearing fit ISO tolerance mechanical alignment load distribution Bearing housing bore in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Bearing block

A housing component that supports and aligns linear bearings within a guide system.

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Engineering Analysis

Risks & Mitigation
  • Bore ovality causing uneven load distribution
  • Thermal expansion mismatch leading to bearing seizure
  • Corrosion pitting reducing fatigue life
  • Improper fit causing bearing creep or fretting
FMEA Triads
Trigger: Inadequate machining accuracy
Failure: Bore ovality exceeding tolerance
Mitigation: Implement statistical process control (SPC) for bore machining, use CMM verification, and apply corrective honing processes
Trigger: Thermal expansion coefficient mismatch
Failure: Bearing seizure during operation
Mitigation: Select housing materials with compatible thermal expansion, incorporate thermal analysis in design, and use appropriate fit selection based on temperature range

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
ISO 286-2:2010 for bore diameter tolerances, ISO 1101:2017 for geometric tolerancing
Test Method
Coordinate measuring machine (CMM) verification per ISO 10360-2, surface roughness testing per ISO 4287, hardness testing per ISO 6506-1

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 clearance fit and interference fit for bearing housing bores?

Clearance fit (e.g., H7/g6) allows easy bearing installation and accommodates thermal expansion but may cause bearing creep under load. Interference fit (e.g., H7/p6) prevents bearing rotation in the housing, improves load transfer, but requires precise temperature control during assembly.

How does bore surface finish affect bearing performance?

Poor surface finish (Ra > 3.2 μm) can cause micro-welding, increased friction, and premature bearing wear. Optimal finish (Ra 1.6-3.2 μm) ensures proper seating, reduces stress concentrations, and maintains lubrication film integrity.

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.

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