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 History of this Word

"head" is from "headfod", spoken by people in England during 450-1100 A.D.

"screw" is from "escroue" (hole that a screw turns in), spoken in France during 1000-1400 A.D.
which was from "scrofa" (sow, threads of a screw look like the curl of a sow's tail), spoken by ancient people in central Italy around 700 B.C.

"bolt" is from "bolt" (arrow), spoken by people in England during 450-1100 A.D.

Definition

head illustration A larger part on one end of a screw or bolt that holds it above the surface of the object. Added during manufacture. Designed to mesh with a tool so the screw or bolt can be rotated but in some cases it is designed to mesh with the object and prevent rotation. There are many different designs that mesh with various tools.

Examples of how the word is used

head illustration We design and build Nutcaps and Screwcaps to cover the sharp ends of screws, screwheads, and nuts.
head illustration The screw is driven in so the head is just below the surface.