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Rivet
A rivet is a cylindrical fastener which fits through a tight-fitting hole. The end of the rivet is then hammered or "peened" over so that it spreads out like a mushroom, so that the rivet will stay in place. Generally, rivets are one-time fasteners, for parts which are not expected to be disassembled for servicing.
Rivets are commonly used to assemble derailers, fenders and saddles. They are also used to assemble low-quality pedals and cranks/chainwheels.
The links of a bicycle chain are held together by rivets (sometimes also called "link pins") which in most cases only have a slight thickening at the ends, rather than a seriously spread head. This allows chain links to be disassembled by partially removing the rivet, then driving the rivet back in with a chain tool. The narrowest chains used can not be reassembled with a chain tool, but rather, must be reassembled using a special replacement rivet or master link.
