Linchpins, also known as Linch Pins, Lynchpins, and Lynch Pins are self-locking pins inserted cross-wise through the end of an axle to stop the wheel from sliding off the axle. The word comes from middle english meaning an axletree pin.
Lynch Pins Diameters
Lynch Pins are available on the FCH Network with Imperial/US diameters that range from #1 to 6 and with Metric diameters that range from M6 to M12. The length of Lynch Pins is usually measured from the point to the underside of the head.