headbolt

Etymology

From head + bolt.

headbolt means A bolt that is used to secure the head of something (such as the cylinder head of an internal combustion engine). Lexicurio rates it Sui generis — a strength score of 91 out of 100.

noun

A bolt that is used to secure the head of something (such as the cylinder head of an internal combustion engine).“The headbolt heater consists of a hollow steel bolt containing an electric heating element. This device is designed to heat the water jacket and is applied to the engine head by replacing a headbolt.”