What is a locknut? Lock nuts are half the thickness of standard nuts. When tightened against a standard nut it will lock the two nuts in place. They can also be used in situations where a standard nut will not fit.
Also known as a locking nut, self-locking nut, prevailing torque nut or a stiff nut. Can be referred to locknut or lock nut.
Available in a variety of sizes in zinc plated steel.