![Grade A Nylon Insert Locknut, National Fine (Bulk Carton)](http://www.sterlinghardware.com/cdn/shop/products/00250_450_{width}x.jpg?v=1575439622)
Grade A Nylon Insert Locknut, National Fine (Bulk Carton)
Hex nut with a nylon-filled collar at its back end. When a screw reaches the collar, the threads and nylon form a tight, frictional fit, restricting movement of the screw when it is subjected to vibration. Designed to be used with like-matter.