We may have a language problem....
English use of the word bolt donates a fastener with a shank. a set screw will not have a shank, and is frequently abbreviated to screw. These only apply to machine screws.... I.E. threaded fasteners with constant diameter.... a coach bolt may or may not have a shank, but will have a square head, and a tapering thread.
I think the terms are not really defined.... and if they are used in different ways by different people then they can *never* be relied on as a sole description, and if it is important the way it is being used the term must be defined as it is used.
-- Jonathan
Barnes's theorem; for every foolproof device there is a fool greater than the proof.
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