Structured Manufacturing Data (2026)

Coupling Hub

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Coupling Hub used in the Machinery and Equipment Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Coupling Hub is characterized by the integration of Bore and Keyway. In industrial production environments, manufacturers listed on CNFX commonly emphasize Carbon Steel construction to support stable, high-cycle operation across diverse manufacturing scenarios.

The central connecting element of a shaft coupling that mounts directly onto the shaft ends to transmit torque between rotating components.

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Product Specifications

Technical details and manufacturing context for Coupling Hub

Definition

A coupling hub is the core component of a shaft coupling or adapter system that provides the mechanical interface for connecting two rotating shafts. It typically features a bore for shaft insertion, keyways or splines for torque transmission, and mounting surfaces for attaching to other coupling elements like flanges, spiders, or flexible elements. The hub ensures precise alignment and secure power transfer while accommodating minor misalignments depending on the coupling type.

Working Principle

The coupling hub transmits rotational force (torque) from one shaft to another through mechanical connection. It is secured to the shaft via interference fit, keyways, splines, or clamping mechanisms. When torque is applied, the hub rotates with the shaft, transferring motion to the mating coupling component, which then drives the connected shaft. The design must withstand shear forces, torsional stresses, and maintain concentricity for efficient power transmission.

Common Materials

Carbon Steel, Alloy Steel, Stainless Steel

Technical Parameters

Bore diameter - the critical dimension that must match the shaft diameter for proper fit and torque transmission (mm) Per Request

Components / BOM

Bore Part
Provides the mounting surface for shaft insertion and secure attachment

Material: steel
Keyway Part
Accommodates the key that prevents rotational slippage between hub and shaft

Material: steel
Flange Face Part
Flat mounting surface for connecting to other coupling components via bolts

Material: steel
Pilot Diameter Part
Precise outer diameter that ensures concentric alignment with mating components

Material: steel

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Coupling Hub.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Shaft Coupling / Adapter

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Coupling/Belt System

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Shaft/Coupling

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Drive Nut or Motor Coupling

View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems

Downstream Applications

Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits

pressure:	Not applicable (mechanical component)
other spec:	Max Torque: 500-5000 Nm (varies by size), Max RPM: 3000-6000 (varies by design)
temperature:	-40°C to +120°C

Media Compatibility

✓ Industrial machinery shafts ✓ Pump and compressor drives ✓ Conveyor system power transmission

Unsuitable: Submerged in corrosive chemicals or abrasive slurries without protective sealing

Sizing Data Required

Shaft diameter (mm/in)
Required torque transmission (Nm/lb-ft)
Operating speed (RPM)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause

Misalignment-induced fatigue

Cause: Improper installation leading to angular, parallel, or axial misalignment, causing cyclic stress and premature material fatigue

Lubrication failure and fretting corrosion

Cause: Inadequate or contaminated lubrication, combined with micro-motion between hub and shaft, leading to surface degradation and seizure

Maintenance Indicators

Unusual vibration or audible knocking during operation, indicating misalignment or component wear
Visible rust, discoloration, or lubricant leakage around the hub-shaft interface, suggesting seal failure or corrosion

Engineering Tips

Implement precision laser alignment during installation and periodic re-alignment checks to minimize stress concentrations
Establish a strict lubrication schedule using manufacturer-specified grease, and monitor for contamination to prevent fretting and corrosion

Compliance & Manufacturing Standards

Reference Standards

ISO 9001:2015 Quality Management Systems ANSI/AGMA 9002-B04 Flexible Couplings - Keyless Fits DIN 740-2 Flexible Shaft Couplings - Requirements and Testing

Manufacturing Precision

Bore Diameter: +/-0.025mm
Hub Face Runout: 0.05mm TIR

Quality Inspection

Magnetic Particle Inspection for Surface Defects
Hardness Testing (Rockwell C Scale)

Factories Producing Coupling Hub

Manufacturer profiles with relevant production capability in China

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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 materials are available for coupling hubs?

Our coupling hubs are manufactured in carbon steel, alloy steel, and stainless steel to suit different industrial environments and strength requirements.

How does a coupling hub transmit torque?

The coupling hub mounts directly onto shaft ends and uses its flange face, keyway, and pilot diameter to securely connect rotating components and transmit torque efficiently.

What specifications should I consider when selecting a coupling hub?

Key specifications include bore size, flange face dimensions, keyway measurements, and pilot diameter to ensure proper fit and torque transmission for your machinery.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

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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