wood-ruff key

feather key

flat saddle key

gib head key

ductile material

brittle material

elastic material

hard material

right hand threads on bout ends

left hand threads on both ends

left hand threads on one end and right hand threads on other end

no threads

foundation purposes

locking devices

absorbing shock and vibrations

lifting and transportation of machines and cubicles.

one small 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

hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is stewed 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 pin splitted and bent in reverse direction at other end