Collar Lock Nuts / Stover Lock Nuts

Collar lock nuts, also known by the brand name Stover® lock nuts, are one-piece hex nuts with a conical top and a flat bottom bearing surface with chamfered corners. 

Frequently Asked Questions About Collar Lock Nuts

What are collar lock nuts used for? 

They are frequently used in farming, automotive, and metalworking industries because they can withstand shock loads and severe vibration. 

How does a collar lock nut work?

The oval locking collar on the top of the nut grips the bolt and gives it vibration resistance, as well as prevents it from loosening. This collar also gives the nut its prevailing torque characteristics. 

What is the difference between a collar lock nut and a nylon insert lock nut?

The key difference is the locking mechanism: a collar lock nut uses a metal locking collar to create locking friction, whereas a nylon insert lock nut uses a polymer ring. 

What sizes do collar lock nuts come in?

AFT offers collar lock nuts in diameter-thread sizes ranging from 1/4”-20 to 1-1/2”-12. 

What materials and finishes are collar lock nuts available in? 

Collar lock nuts are made from steel and come in a cadmium yellow & wax finish.