headbolt

English

Alternative forms

• head bolt
• head-bolt

Etymology

head +‎ bolt

Noun

headbolt (plural headbolts)

1. A bolt that is used to secure the head of something (such as the cylinder head of an internal combustion engine).
   • 1949, American Railway Engineering Association, Bulletin - Issues 481-487, page 277:

     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.

   • 1953, Commercial Car Journal - Volume 86, page 79:

     A second type replaces a headbolt or freeze plug depending on manufacturer's recommendations included with the unit.

   • 2008, Design and Construction Guidance for Community Safe Rooms, page 7-24:

     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.

Derived terms

• headbolt heater

Anagrams

• Theobald, bolthead