Self-locking threaded fastener and unlocking tool combination

摘要

A threaded bolt has two elongated shank parts, the adjoining part ends having mating, stepped shapes. The shank parts when held and rotated in unison can be threaded in a piece such as a nut, but when not so held will frictionally bind in the threads of the piece. A keyway is provided through the shank parts to receive a key for rotating the parts in unison, preventing relative rotational movement therebetween, so that the nut and shank parts may be freely threadingly rotated in the aforesaid piece.