Nuts > Lock Nuts

Lock Nuts

Lock Nuts

Lock nuts are used to resist loosening under vibration and torque.  We stock many different varieties of locknut for many different applications


A nylon insert lock nut is a kind of nut that includes a nylon collar insert. The insert is placed at the end of the nut and its inner diameter (ID) is slightly smaller than the major diameter of the screw.

A castle nut or slotted nut, is a nut with slots (notches) cut into one end. The name comes from the nut's resemblance to the  parapet of a medieval castle.  Commonly used in low-torque applications

Center lock nuts and top lock nuts are a type of distorted thread locknut.  They use a deformed section of thread to keep the nut from loosening from vibrations or rotation of the clamped item. Because these nuts are solid metal, they are effective in elevated temperature settings. These nuts are deformed so that the threads are no longer perfectly circular in one section of the nut.  The nut is easily started since the bottom portion is not deformed.  Once the male fastener (bolt) reaches the deformed section it will deform the threads back in to a circle.  This increases friction and creates a locking action. 

A jam nut is a low profile type of nut, typically half as tall as a standard nut. It is commonly used as a type of locknut, where it is "jammed" up against a standard nut to lock the two in place. It is also used in situations where a standard nut would not fit.

A flange lock nut has a wide flange at one end that acts as an integrated, non-spinning washer. This serves to distribute the pressure of the nut over the part being secured, reducing the chance of damage to the part and making it less likely to loosen as a result of an uneven fastening surface.  The flange is serrated to provide a locking action. The serrations are angled such that they keep the nut from rotating in the direction that would loosen the nut