In machines and structures, washers are the most common yet most overlooked small parts. Placed between the screw/nut and the mating...

In many machines and structures, a spring pin is a fastener that relies on its own elasticity to fasten and locate parts.It is typically...

In many machines and structures, the cotter pin is a simple-looking part that provides crucial safety. Commonly used with nuts,...

In mechanical transmission and assembly, the parallel key  is a small yet crucial component that determines whether parts operate...