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