Lynch Pins—also are also call quick pins or linchpins — they a self-locking pin inserted crosswise as through the end of an axle or shaft. These fasteners securely keep objects from sliding off its axle. Lynch Pins are often used to attach tractor implements, secure trailer couplers, hitch pins, or doors, among a variety of other applications where quick connect and disconnect between mating parts is desired.
A linch pin (also linchpin, lynch pin, and click pin) entails a locking ring into the pin design that fastens the pin in place with an audible ‘snap’ to ensures it’s lock.