headbolt
nounEtymology From head + bolt.
1
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.1949, American Railway Engineering Association, Bulletin - Issues 481-487, page 277:
- A second type replaces a headbolt or freeze plug depending on manufacturer's recommendations included with the unit.1953, Commercial Car Journal - Volume 86, page 79:
1 more example
- These systems consisted of a panic-bar-activated headbolt, footbolt, and mortised deadbolt. The headbolt and footbolt are 5/8-inch stainless steel bolts with a -inch projection (throw) at the top and bottom encased in stainless steel channels.2008, Design and Construction Guidance for Community Safe Rooms, page 7-24:
- Derived terms
- headbolt heater