INDUSTRY COMPONENT

Shaft Bore

Precision-machined bore in a hub or center plate for shaft mounting and torque transmission

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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
  • 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
Standards
ISO 286, DIN 7154, ISO 1101, DIN 7184

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Shaft Bore.

shaft bore hub bore center plate bore precision machining interference fit keyway design spline connection bore tolerance mechanical interface torque transmission Shaft Bore in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Hub/Center Plate

The central structural component of an impeller or blade assembly that connects the blades to the rotating shaft.

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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

Interchangeable Parts

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

Buyer Feedback

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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.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Shaft Body / Journal Shaft Connection