Shaft Bore: Concentricity 0.01-0.05 mm TIR

Component Specifications

Definition

A shaft bore is a cylindrical opening precisely machined into a hub or center plate component to accommodate a rotating shaft. This critical interface enables torque transmission, radial load support, and rotational alignment between connected mechanical elements. The bore's dimensional accuracy, surface finish, and geometric tolerances directly impact system performance, vibration characteristics, and service life.

Working Principle

The shaft bore functions as a mechanical interface that transfers rotational motion and torque from the shaft to the hub/center plate through interference fit, keyway, or spline connections. It maintains concentric alignment, distributes radial loads evenly, and prevents relative motion between components during operation. Proper bore design ensures minimal clearance or controlled interference to optimize power transmission efficiency while preventing fretting, wear, or fatigue failure.

Materials

Typically manufactured from medium-carbon steels (AISI 1045, 4140), alloy steels (AISI 4340), or ductile iron (65-45-12). Surface treatments may include induction hardening (HRC 50-55), nitriding, or chrome plating for wear resistance. Corrosion-resistant applications use stainless steels (AISI 304, 316) or aluminum alloys (6061-T6).

Technical Parameters

Parameter	Typical range	Notes & selection driver
Bore Diameter	10-500 mm (standard range)
Concentricity	0.01-0.05 mm TIR
Surface Finish	Ra 0.8-3.2 μm
Tolerance Class	H7, H8, or interference fits (p6, s7)
Keyway Standards	ANSI B17.1, DIN 6885
Spline Standards	ANSI B92.1, DIN 5480

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 286, DIN 7154, ISO 1101, DIN 7184

Engineering Analysis

Risks & Mitigation

Concentricity deviation causing vibration
Improper fit leading to slippage or fatigue failure
Surface damage during assembly/disassembly
Corrosion at shaft-bore interface

FMEA Triads

Trigger: Inadequate interference fit design
Failure: Shaft slippage under peak torque loads
Mitigation: Calculate required interference using Lame's equations; implement quality control for bore diameter measurements

Trigger: Poor surface finish or contamination
Failure: Fretting corrosion and crack initiation
Mitigation: Specify Ra ≤ 1.6 μm; implement cleaning protocols; consider protective coatings

Trigger: Misalignment during assembly
Failure: Eccentric loading and premature bearing failure
Mitigation: Use alignment fixtures; verify concentricity with dial indicators; implement laser alignment systems

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

ISO 286 tolerance grades for holes (IT6-IT8); geometric tolerances per ISO 1101 for straightness, roundness, and concentricity

Test Method

CMM measurement for dimensional accuracy; surface profilometry for finish; ultrasonic testing for material integrity; go/no-go gauges for production verification

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 Shaft Bore

Manufacturer profiles associated with Shaft Bore.

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Frequently Asked Questions

What is the difference between clearance fit and interference fit for shaft bores?

Clearance fits (H7/g6) allow easy assembly/disassembly with minimal friction, suitable for low-torque applications. Interference fits (H7/s6) create permanent connections through elastic deformation, providing higher torque capacity but requiring hydraulic/press fitting equipment.

How does bore surface finish affect performance?

Surface finish (Ra value) impacts friction, wear, and fatigue life. Smoother finishes (Ra 0.8-1.6 μm) reduce fretting corrosion and improve fatigue resistance in dynamic applications, while rougher finishes may retain lubrication better in certain conditions.

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.

Shaft Bore