Editorial Technical Reference

Hub

This page explains how Hub is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

The central mounting component of a mixing impeller that connects the blades to the drive shaft.

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Product Specifications

Technical details and manufacturing context for Hub

Definition
In a mixing impeller, the hub is the central structural component that serves as the mounting point for the blades. It provides the mechanical interface between the rotating blades and the drive shaft, transmitting torque from the shaft to the blades while maintaining proper blade alignment and spacing. The hub's design directly affects the impeller's balance, vibration characteristics, and overall structural integrity during operation. The hub is typically fixed to the drive shaft via a keyway, spline, or clamping mechanism. When the shaft rotates, torque is transferred through the hub to the attached blades, causing them to rotate and impart motion to the fluid. The hub must withstand centrifugal forces from the rotating blades, shear stresses from torque transmission, and bending moments from fluid resistance. Common materials include stainless steel (e.g., 304, 316), carbon steel, cast iron, and aluminum alloy. A key specification is the bore diameter, which must match the shaft diameter for proper fit. For any specific application, verify the exact material grade, bore size, and design with the legal manufacturer or supplier, as these parameters affect performance and safety.
Working Principle
The hub is fixed to the drive shaft (typically via a keyway, spline, or clamping mechanism). When the shaft rotates, torque is transferred through the hub to the attached blades, causing them to rotate and impart motion to the fluid. The hub must withstand centrifugal forces from the rotating blades, shear stresses from torque transmission, and bending moments from fluid resistance.
Common Materials
Stainless Steel (e.g., 304, 316), Carbon Steel, Cast Iron, Aluminum Alloy
Technical Parameters

What to specify in your RFQ

  • Bore diameter (shaft diameter compatibility) in mm

These are the quantities to specify to the manufacturer when sizing or requesting a quote. The manufacturer's own documentation governs the exact figures and applicable standard.

Components / BOM
  • Blade Mounting Flanges Part
    Provide attachment surfaces or slots for securing impeller blades
    Material: Same as hub material
  • Set Screw Holes Part
    Allow installation of set screws for additional shaft securing
    Material: Same as hub material

Applied To / Applications

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

Mixing Impeller
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Paddle Wheel
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Drive Pulley/Sprocket
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Star Wheel
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Drum or Sheave
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Impeller/Fan
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Head Pulley/Sprocket
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Sprockets/Gears
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Shaft Coupling
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Coupling / Drive Mechanism
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Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 10 bar
flow rate: Dependent on impeller design
temperature: -40°C to 150°C
slurry concentration: Up to 60% solids by weight
Media Compatibility
✓ Water-based solutions ✓ Chemical slurries ✓ Food-grade media
Unsuitable: Highly corrosive acids (e.g., hydrofluoric acid)
Sizing Data Required
  • Shaft diameter
  • Impeller torque requirement
  • Operating RPM

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Bearing fatigue failure
Cause: Cyclic loading beyond design limits leading to subsurface crack propagation and eventual spalling
Shaft-hub interface fretting corrosion
Cause: Micro-motion between mating surfaces under load, combined with environmental contaminants, causing material degradation and loss of interference fit
Maintenance Indicators
  • Abnormal high-frequency vibration or audible whining during operation
  • Visible discoloration (blueing) or heat haze around hub body indicating overheating
Engineering Tips
  • Implement precision laser alignment during installation and periodic verification to minimize parasitic loads on hub bearings
  • Establish controlled torque procedures for fasteners and use thread-locking compounds to maintain proper preload and prevent interface loosening

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ANSI/ASME B18.2.2 (Square and Hex Nuts and Bolts) DIN 6325 (Parallel Keys and Keyways)

Quoted from the published standard.

Manufacturing Precision
  • Bore Diameter: +/-0.025 mm
  • Hub Flange Flatness: 0.05 mm
Quality Inspection
  • Dimensional Verification (CMM)
  • Hardness Testing (Rockwell C Scale)

Manufacturers of Hub

Manufacturer profiles associated with Hub.

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Technical documentation
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Frequently Asked Questions

What is the function of the hub in a mixing impeller?

The hub is the central structural component that mounts the blades and connects them to the drive shaft. It transmits torque from the shaft to the blades, ensuring they rotate together and maintain proper alignment and spacing.

How is the hub attached to the drive shaft?

The hub is typically fixed to the drive shaft using a keyway, spline, or clamping mechanism. The specific method depends on the design and application requirements.

What materials are commonly used for hubs?

Common materials include stainless steel (e.g., 304, 316), carbon steel, cast iron, and aluminum alloy. The choice depends on factors like corrosion resistance, strength, and weight.

What specification is critical for hub selection?

The bore diameter is a critical specification, as it must match the drive shaft diameter for a proper fit. Always verify the exact bore size and other design parameters with the manufacturer for your specific application.
Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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