Linch Pins

A linchpin, also spelled linch pin, lynchpin, or lynch pin, is a fastener used to prevent a wheel or other part from sliding off the axle upon which it is riding. The word is first attested in the late 14th century and derives from Middle English elements meaning "axletree pin".

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Detailed Description for Linch Pins

Hitch pins and their variations are simple forms of hardware used to temporarily mount or conjoin mating components. Linch pins are specifically designed to retain a wheel or other rotating device on its axle, but can be used as a fastener as well. Both of these types of pins require mating holes and some form of a lock to be effective. They are most commonly found on vehicle trailers.


All of the types of pins listed in this guide require at least one predrilled hole that is meant to hold and retain objects in place. For coupling applications, two mating segments are aligned and then held in position by the pin. Hitch pins and clevis pins require an additional cotter pin inserted perpendicularly to lock the pin in position. Linch pins, detent pins, snapper pins, safety spring pins, and toggle pins all contain integral locking mechanisms.



  • Hardened and ground steel undergoes a heat treatment process that compacts carbon atoms, resulting in a stronger but more brittle version of the metal. If uncoated, it is likely to oxidize under certain conditions.
  • Unhardened steel is more malleable and less expensive, but also cannot handle extreme loads. It is vulnerable to corrosion.
  • Stainless steel is corrosion resistant, aesthetically appealing, and exceptionally strong, but is also more expensive than other steel options.
  • Brass provides quality strength, conductivity, corrosion resistance, and low-magnetic permeability, but is limited to a lower working load.



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