Cotter pin, also known as split pins or cotter keys, are metal fasteners that feature two tines that are bent during installation, similar to a staple or rivet. They are usually manufactured from thick wire with a half-circular cross section. Cotter pins come in a variety of sizes and types.
Spring pins, also known as tension or roll pins, are a mechanical fastener used to secure the position of two or more parts of a machine relative to each other. The diameter of a spring pin is larger than the hole diameter, of which it is being installed into. Featuring a chamfer on either one or both ends, helps starting the pin into the hole. The spring action of the pin allows it to compress as if assumes the diameter of the hole, securing the pin in the hole.
There are two types of clevis pins, threaded and unthreaded. Unthreaded clevis pins feature a domed head at one end and a cross-hole at the other. Secured by a cotter or split pin. Threaded clevis pins feature a formed head with a partially threaded shank. The formed head has a flattened tab with a cross-hole and a lip, which acts as a stop when threded into a shackle.
Dowels are cylindrical rods, manufactured from wood, plastic or metal. Dowel are used for a number of different applications, most commonly used in structural reinforcement, such as cabinet making.
Taper pins are a type of fastener used in mechanical engineering. The steel rod fastener features one end with a slightly larger diamete than the other.