Metric ASTM Hex Head Nuts Gr2 Plain Finish 9/16"-18 3/8"-24 Prevailing Torque Type Hexagon Top Lock Nut

The toplock nuts are manufactured from low-carbon steel to meet Grade A performance specifications. These kinds of prevailing torque lock nuts are designed for use in non-critical applications with Grade 2 or Grade 5 hex bolts, or other customized bolts. 

The lock nuts can be supplied with a mutitude of finishes or customer-specific coatings.

There are many kinds of lock nut. Prevailing Torque Type Hexagon Top Lock Nut.
The first is on the outer surface of the nut to the inner circumferential surface of the threaded screw holes drilled therethrough (typically two, distributed in the outer-section 90) for screwing the small-diameter countersunk screws, the purpose is to thread applying a radial direction of force to prevent the lock nut loosened. At present quality on the market in a better lock nut inner peripheral surface of the nut encrusted consistent with the lock nut threaded brass pieces, to avoid radial top screws directly contacts the locking threads and damaged By. This rotational movement of the locking nut locking shaft-type parts of the case gradually began to use, such as a ball screw mounting end bearing locking.

The second lock nut is composed of two parts, each part has staggered cam, wedge design due to internal slope angle oblique angle is larger than the nut bolts, this combination will firmly bite into one whole, when vibration occurs when, DISC-lOCK locknut raised portions mutually dislocation, resulting in uplift tension to achieve the perfect anti-loosening effect.
The fifth is locking structure, designed by improvements on the threaded structure, without the help of other external.

The third lock nut is DIN985, with nylon insert.