Inserts are classified as two general types: those held in place by external threads and those that use some means other than threads (knurls, grooves, interference fit) for their holding power.

Externally threaded fasteners with locking devices use the same techniques as locknuts. Prevailing-torque locking screws employ distorted threads, interference fits, inserts, or a chemical adhesive ...

Unlike thread locking forms, self locking fasteners with a preload locking internal thread form prevent high logistical, service and warranty costs (PRWEB) October 17, 2007 -- While threaded fastener ...