a round shank with a preformed primary head on one end and a snap head on the other end that is formed during the riveting process.
Types of rivets include the buttonhead, countersunk, rounded countersunk, cylindrical, conical, and conical with a neck. Rivet sizes are specified by standards. In addition to standard rivets, special rivets, such as tubular or explosive rivets are also used.
Rivets may be made of steel, copper, brass, aluminum, and other alloys that are sufficiently soft for shaping the heads. To avoid electrochemical corrosion and the effects of temperature changes on the forces in the joint, the rivet must be of the same material as that of the parts to be joined.