Key bolt

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a bolt which has a mortise near the end, and is secured by a cotter or wedge instead of a nut.

See also: Key

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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DISCIPLINE IS KEY Bolt was born on 21 August 1986 and raised in the laid-back parish of Trelawny, Jamaica.
Our hands and backs were sore, and we were mysteriously short of one key bolt, but we were pretty proud of our achievement.