This FASTMAN Screw-Lock one-piece insert provides all the thread protection of the Standard (Free Running) Thread Insert, PLUS an exclusive internal locking feature that eliminates the need of clumsy protruding lock-nuts, lock-wiring and other supplementary locking devices.

Further it saves cost, space and weight, and permits simplified streamlined design.

The insert is a permanently integrated part of the component permitting repeated service repair disassembly and reassembly, with locking action remaining unchanged.