INDUSTRY COMPONENT

Spline Shaft

A spline shaft is a precision mechanical component with longitudinal grooves that transmits torque while allowing axial movement in steering systems.

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Component Specifications

Definition
A spline shaft is a cylindrical mechanical component featuring a series of longitudinal ridges (splines) that mesh with corresponding grooves in a mating part, such as a Pitman arm or rack assembly. In automotive steering systems, it transmits rotational torque from the steering gear to the steering linkage while permitting controlled axial movement to accommodate suspension travel and steering adjustments. The spline geometry ensures precise angular alignment and torque transmission without slippage.
Working Principle
The spline shaft operates on the principle of positive mechanical engagement, where the interlocking splines transfer rotational force (torque) between connected components. In recirculating-ball steering systems, it connects the Pitman arm to the steering gearbox output, converting rotary motion into linear motion for wheel turning. In rack-and-pinion systems, it may integrate with the rack to provide adjustable length or connection points. The spline design allows for slight axial sliding to compensate for dimensional changes during operation while maintaining torque transmission integrity.
Materials
Typically manufactured from medium-carbon alloy steels such as AISI 4140 or 4340, heat-treated to achieve surface hardness of 45-55 HRC for wear resistance and core toughness. Corrosion-resistant coatings like zinc plating or phosphate treatments are often applied.
Technical Parameters
  • Length 150-400 mm
  • Spline Type Involute or straight-sided
  • Major Diameter 20-50 mm
  • Surface Finish Ra 1.6-3.2 μm
  • Torque Capacity 200-800 Nm
  • Number of Splines 10-36 teeth
Standards
ISO 4156, DIN 5480, SAE J498

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Spline Shaft.

spline shaft steering component torque transmission Pitman arm rack and pinion automotive engineering power transmission Spline Shaft in Motor Vehicle Manufacturing

Parent Products

This component is used in the following industrial products

Pitman Arm (for recirculating-ball type) or Rack (for rack-and-pinion integration)

A critical linkage component in a vehicle's steering system that converts the rotational motion from the steering gearbox into lateral motion to turn the wheels.

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Engineering Analysis

Risks & Mitigation
  • Spline wear leading to steering play
  • Corrosion causing seizure
  • Improper torque transmission due to misalignment
FMEA Triads
Trigger: Inadequate lubrication
Failure: Accelerated spline wear and increased backlash
Mitigation: Regular maintenance with high-pressure grease and use of corrosion-resistant materials
Trigger: Misalignment during assembly
Failure: Uneven load distribution and premature fatigue failure
Mitigation: Precision alignment tools and torque-controlled installation procedures

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Spline dimensions typically held to IT7-IT8 accuracy, with profile tolerances per ISO 1101
Test Method
Coordinate measuring machine (CMM) verification, torque testing under load, salt spray testing for corrosion resistance

Buyer Feedback

★★★★☆ 4.8 / 5.0 (14 reviews)

"Standard OEM quality for Motor Vehicle Manufacturing applications. The Spline Shaft arrived with full certification."

"Great transparency on the Spline Shaft components. Essential for our Motor Vehicle Manufacturing supply chain."

"The Spline Shaft we sourced perfectly fits our Motor Vehicle Manufacturing production line requirements."

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Frequently Asked Questions

What is the difference between involute and straight-sided splines?

Involute splines have curved tooth profiles that provide better load distribution and self-centering, while straight-sided splines are simpler to manufacture but may have higher stress concentrations.

How does a spline shaft accommodate axial movement?

The spline design allows the mating component to slide along the shaft's length while maintaining rotational engagement, which is essential for adjusting steering linkage or absorbing suspension movements.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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