headbolt

English

Alternative forms

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.

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