INDUSTRY COMPONENT

Keyway/Spline

Keyway and spline are mechanical components used to transmit torque between shafts and rotating elements like gears, pulleys, and couplings.

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Component Specifications

Definition
A keyway is a longitudinal slot machined into a shaft or hub to accommodate a key, which prevents relative rotation. A spline consists of multiple longitudinal ridges (teeth) on a shaft that mesh with grooves in a mating hub, allowing torque transmission while permitting axial movement. Both are critical for secure power transmission in mechanical systems.
Working Principle
Keyways work by inserting a metal key into machined slots on both the shaft and hub, creating a positive mechanical lock against rotation. Splines operate through interlocking teeth between shaft and hub, distributing torque across multiple contact surfaces for higher load capacity and allowing controlled axial sliding motion.
Materials
Typically made from alloy steels (AISI 4140, 4340), carbon steels (1045, 1144), or stainless steels (304, 316). Surface treatments include hardening (case hardening, induction hardening), nitriding, or plating for wear resistance.
Technical Parameters
  • Fit Class ANSI B92.1, DIN 5480, ISO 4156
  • Keyway Types Square, rectangular, Woodruff, Gib-head
  • Module/Pitch 0.5-10 mm
  • Spline Types Involute, straight-sided, serrated
  • Pressure Angle 30°, 37.5°, 45°
  • Tolerance Grade IT5-IT9
Standards
ISO 4156, DIN 5480, ANSI B92.1, JIS B 1601

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Keyway/Spline.

keyway spline shaft coupling torque transmission mechanical components power transmission actuator components industrial engineering Keyway/Spline Keyway/Spline in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Actuator/Shaft

A mechanical component that transmits rotational motion and torque within damper/louver systems.

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Hub Assembly

The central rotating component of an infeed starwheel that provides mounting points for starwheel arms and facilitates smooth rotation.

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Mounting Hub/Drive Shaft

A mechanical component that serves as both a mounting interface and power transmission element within a digging assembly.

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Engineering Analysis

Risks & Mitigation
  • Shear failure under overload
  • Wear and fretting corrosion
  • Improper fit causing vibration
  • Stress concentration at keyway corners
  • Misalignment during assembly
FMEA Triads
Trigger: Insufficient material strength or improper heat treatment
Failure: Shear failure of key or spline teeth under torque overload
Mitigation: Use appropriate material grades with proper hardening, conduct torque capacity calculations, implement overload protection devices
Trigger: Poor manufacturing tolerances or improper fit
Failure: Excessive backlash, vibration, and accelerated wear
Mitigation: Adhere to ISO/DIN standards for tolerances, use proper gauging during manufacturing, implement quality control checks
Trigger: Inadequate lubrication in sliding spline applications
Failure: Galling, seizing, and excessive wear of spline teeth
Mitigation: Specify proper lubricants, design lubrication channels, implement maintenance schedules for re-lubrication

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
ISO 286 for shaft/hole fits, ISO 4156 for spline dimensions, typical fits: H7/h6 for keyways, 5H/5h for precision splines
Test Method
Coordinate measuring machines (CMM) for dimensional verification, surface roughness testing, hardness testing, torque testing for load capacity validation

Buyer Feedback

★★★★☆ 4.8 / 5.0 (14 reviews)

"Found 34+ suppliers for Keyway/Spline on CNFX, but this spec remains the most cost-effective."

"The technical documentation for this Keyway/Spline is very thorough, especially regarding technical reliability."

"Reliable performance in harsh Machinery and Equipment Manufacturing environments. No issues with the Keyway/Spline so far."

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Frequently Asked Questions

What is the difference between keyway and spline?

Keyways use a single key for torque transmission with fixed positioning, while splines use multiple interlocking teeth that allow axial movement and distribute loads across more surface area.

When should I use splines instead of keyways?

Use splines for higher torque capacity, applications requiring axial movement (sliding connections), or when precise angular positioning is needed. Keyways are simpler and cost-effective for fixed connections with moderate loads.

What are common failure modes for keyways and splines?

Common failures include wear, fretting corrosion, shear failure of keys, tooth deformation in splines, and improper fit leading to backlash or vibration.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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