GD 8 Nylon Ins. Locknut, National Fine (Bulk Carton)

Heat treated hex nut with a nylon filled collar at its back end. The nut shall be grade marked in one of two ways: 1. with double notched corners or 2. with six symmetrically spaced identical symbols on the chamfered surface on top of the nut. When the cap screw or bolt reaches the collar, the threads and nylon form a tight, frictional fit, restricting movement of the cap screw or bolt when it is subjected to vibration. *PL-Plain; *ZY-Yellow Zinc