Description
1/2"-13 UNC NE (STANDARD) NYLON INSERT LOCKNUTS COARSE LOW CARBON ZINC CR+3 [1000BX]
A hex nut with a nylon filled collar at its back end. When a screw or bolt reaches the collar, the threads and nylon form a tight frictional fit, restricting movement between the nut and bolt or screw when subjected to vibration.