Flywheel hub: Weight Capacity 50-500 kg, Hub Thickness 20-80 mm

Component Specifications

Definition

A flywheel hub is a precision-engineered mechanical component designed as the central interface between a flywheel and a crankshaft or rotating shaft. It serves as the structural anchor point that transmits rotational energy from the engine or motor to the flywheel mass, ensuring balanced rotation and energy storage. The hub typically features a precisely machined bore for shaft mounting, bolt patterns for flywheel attachment, and often includes timing marks or alignment features for proper installation.

Working Principle

The flywheel hub operates on the principle of rotational force transmission and inertia management. It rigidly connects the rotating shaft to the flywheel mass, allowing kinetic energy to be stored in the flywheel during acceleration and released during deceleration. The hub maintains precise alignment between the shaft and flywheel, ensuring balanced rotation and minimizing vibration through its symmetrical design and accurate mounting surfaces.

Materials

Typically forged or cast steel (AISI 4140, 4340), ductile iron (65-45-12), or aluminum alloy (6061-T6) for high-performance applications. Heat treatment to HRC 28-35 for steel components.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Bore Diameter	25-150 mm
Hub Thickness	20-80 mm
Mounting Holes	6-12 holes
Surface Finish	Ra 1.6-3.2 μm
Weight Capacity	50-500 kg
Runout Tolerance	≤0.05 mm
Bolt Circle Diameter	100-300 mm

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 1940-1, DIN 42955, SAE J618, ISO 2768-mK

Parent Products

This component is used in the following industrial products

Flywheel

A rotating mechanical device that stores rotational energy to maintain consistent motion and momentum in machinery.

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Engineering Analysis

Risks & Mitigation

Fatigue failure from cyclic loading
Improper installation causing imbalance
Corrosion in harsh environments
Bolt loosening due to vibration

FMEA Triads

Trigger: Material fatigue from continuous cyclic stress
Failure: Crack propagation leading to hub fracture
Mitigation: Implement regular non-destructive testing (NDT), use fatigue-resistant materials, and maintain within specified load cycles

Trigger: Improper bolt torque during installation
Failure: Uneven load distribution and premature failure
Mitigation: Use calibrated torque wrenches, follow manufacturer specifications, and implement torque verification procedures

Trigger: Misalignment with crankshaft
Failure: Excessive vibration and bearing wear
Mitigation: Use precision alignment tools, verify runout tolerances, and implement alignment checks during installation

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Bore diameter: H7/h6 fit, Bolt holes: ±0.1 mm position tolerance, Face runout: 0.05 mm maximum

Test Method

Dimensional verification with CMM, ultrasonic testing for material defects, dynamic balancing to ISO 1940-1 G6.3 grade, torque testing of mounting bolts

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

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Flywheel hub

Manufacturer profiles associated with Flywheel hub.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the primary function of a flywheel hub?

The primary function is to provide a secure, balanced connection between the rotating shaft and flywheel mass, ensuring efficient energy transfer and vibration-free operation.

How do I select the right flywheel hub material?

Material selection depends on application requirements: forged steel for high-torque industrial applications, ductile iron for cost-effective solutions, and aluminum alloy for weight-sensitive high-speed applications.

What maintenance does a flywheel hub require?

Regular inspection for cracks, wear on mounting surfaces, verification of bolt torque specifications, and checking for proper alignment during routine maintenance intervals.

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.

Flywheel hub