Description:

Silicon bronze nylon insert lock nuts,commonly called nyloc nuts.

C65100 silicon bronze with a nylon insert that has an inner diameter which is smaller a little than the major diamter of using threads,locking this nut in to secure screw/bolt against loosing for vibration.

Normal size:

1/4",5/16",3/8",7/16",1/2",5/8",3/4",etc.