one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

a slot is cut partly in middle of nut and then slot reduced by tightening a screw

a hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip

through slots are made at top and a cotter-pin is passed through these and a hole in the bolt, and cotter spitted and bent in reverse direction at other end

same

coarser

finer

very coarse

screw cutting lathes

feed mechanisms

spindles of bench vices

railway carriage couplings.

increase shank diameter

increase its length

drill an axial hole through head up to threaded portion so that shank area is equal to root area of thread

tighten die bolt properly

wood-ruff key

feather key

flat saddle key

gib head key