Hub Extension: Torque Capacity 500-5000 Nm, Length 30-150 mm

Component Specifications

Definition

A precision-machined cylindrical component that extends the hub of a forged gear blank to interface with a rotating shaft. It provides the mounting surface and bore for secure shaft attachment while maintaining concentricity and torque transmission capabilities required in high-performance gear systems.

Working Principle

Transmits rotational torque from the gear hub to the shaft through mechanical interference fit or keyed connection. Maintains precise radial and axial alignment to prevent vibration, reduce wear, and ensure efficient power transmission in gear assemblies.

Materials

Alloy steel (typically AISI 4140 or 4340), case-hardened to 58-62 HRC surface hardness with tempered core for strength. Alternative: stainless steel (17-4PH) for corrosive environments.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Length	30-150 mm
Concentricity	0.02 mm TIR
Bore Tolerance	H7/h6
Outer Diameter	50-200 mm
Surface Finish	Ra 1.6 μm
Torque Capacity	500-5000 Nm

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 286-2, DIN 5480, ISO 1101

Parent Products

This component is used in the following industrial products

Precision Forged Gear Blank

A near-net-shape forged metal blank designed for subsequent gear machining operations.

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Engineering Analysis

Risks & Mitigation

Misalignment causing vibration and premature wear
Improper fit leading to slippage or fatigue failure
Material defects compromising strength
Corrosion in harsh environments

FMEA Triads

Trigger: Insufficient interference fit
Failure: Slippage between hub and shaft
Mitigation: Precise tolerance control and proper installation procedures

Trigger: Material fatigue from cyclic loading
Failure: Crack propagation and fracture
Mitigation: Proper material selection and heat treatment, regular inspection

Trigger: Corrosion in aggressive environments
Failure: Reduced strength and dimensional accuracy
Mitigation: Corrosion-resistant materials or protective coatings

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Geometric tolerances per ISO 1101, dimensional tolerances per ISO 286-2

Test Method

Dimensional inspection with CMM, hardness testing per ASTM E18, NDT for material defects

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 Hub Extension

Manufacturer profiles associated with Hub Extension.

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Frequently Asked Questions

What is the primary function of a hub extension in gear systems?

It provides the interface between the gear hub and shaft, ensuring precise alignment and efficient torque transmission while minimizing vibration.

How are hub extensions typically mounted to shafts?

Through interference fits (press fits), keyed connections (with Woodruff or parallel keys), or splined interfaces depending on torque requirements.

What maintenance is required for hub extensions?

Regular inspection for wear, corrosion, and proper fit; lubrication of keyways if applicable; and verification of alignment during gear system maintenance.

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.

Hub Extension