INDUSTRY COMPONENT

Spline Teeth

Spline teeth are precision-engineered ridges on shafts and hubs that transmit torque while allowing axial movement in mechanical drive systems.

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Component Specifications

Definition
Spline teeth are a series of parallel ridges or teeth machined onto a shaft or within a hub that mesh with corresponding grooves to transmit rotational torque and power. As part of a drive hub assembly, they provide a positive mechanical connection that prevents slippage while permitting controlled axial movement (sliding) or fixed positioning, depending on the spline type (involute, straight-sided, or serrated). They ensure precise angular alignment and distribute load evenly across multiple contact surfaces.
Working Principle
Spline teeth operate on the principle of mechanical interference and geometric meshing. When the external teeth of a shaft engage with the internal teeth of a hub, torque is transferred through shear forces along the tooth flanks. The involute profile (common in industrial applications) ensures smooth engagement, constant velocity transmission, and self-centering action due to its curved shape, which reduces stress concentration. They allow for relative axial movement in sliding splines or provide a fixed connection in fitted splines, maintaining alignment under rotational loads.
Materials
Typically made from alloy steels (e.g., AISI 4140, 4340) or carbon steels, often heat-treated (case-hardened or through-hardened) to achieve surface hardness of 45-60 HRC for wear resistance, with core toughness. Corrosion-resistant coatings like zinc plating or black oxide may be applied. Alternative materials include stainless steel (e.g., 304, 316) for corrosive environments or powdered metal for cost-effective mass production.
Technical Parameters
  • Fit Class Class 5 (medium fit) to Class 7 (precision fit)
  • Module/Pitch 1-10 mm (metric) or 8-48 DP (imperial)
  • Tooth Profile Involute
  • Axial Movement 0-200 mm (for sliding splines)
  • Pressure Angle 30° or 45°
  • Surface Finish Ra 1.6-3.2 μm
  • Number of Teeth 6-60
  • Torque Capacity 50-5000 Nm (varies with size and material)
Standards
ISO 4156, DIN 5480, ANSI B92.1

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Spline Teeth.

spline teeth drive hub torque transmission involute spline ISO 4156 mechanical coupling shaft hub connection Spline Teeth in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Drive Hub

The central rotating component of a torque limiting clutch that transmits torque from the input to the output while allowing controlled slip when torque exceeds a preset limit.

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Output Hub

The rotating component in a clutch or coupling that transmits torque from the driving member to the driven shaft or system.

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Engineering Analysis

Risks & Mitigation
  • Tooth wear from misalignment or overload
  • Fatigue failure due to cyclic loading
  • Corrosion in humid environments
  • Backlash from poor fit or manufacturing tolerances
FMEA Triads
Trigger: Misalignment during assembly or operation
Failure: Uneven load distribution leading to premature tooth wear or fracture
Mitigation: Use precision machining per standards, implement alignment checks during installation, and apply lubricants to reduce friction.
Trigger: Insufficient hardness or material defects
Failure: Tooth deformation or shearing under high torque
Mitigation: Specify heat-treated materials (e.g., hardened steel), conduct material certification, and perform non-destructive testing (e.g., ultrasonic).

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.025 mm for tooth profile, ±0.05 mm for pitch diameter (per ISO 4156 Class 7)
Test Method
Coordinate measuring machine (CMM) for dimensional accuracy, hardness testing (Rockwell scale), torque testing under load conditions, and visual inspection for surface defects.

Buyer Feedback

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Frequently Asked Questions

What is the difference between spline teeth and gear teeth?

Spline teeth are designed primarily for torque transmission and axial movement with uniform load distribution, often with a straight or involute profile for sliding. Gear teeth are optimized for speed reduction/increase and motion transfer, with profiles like involute or cycloidal for meshing at specific ratios, and typically do not allow axial movement.

How do I select the right spline teeth for a drive hub?

Consider torque requirements, axial movement needs, space constraints, and environmental conditions. Choose based on standards (e.g., ISO 4156 for metric), material (steel for strength, coating for corrosion), fit class (precision for high loads), and profile (involute for smooth engagement). Consult manufacturer catalogs or engineering guidelines.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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