Prevailing Torque Fasteners

A prevailing torque nut creates interference between the nut threads and the bolt threads. A nylon patch on the threads in the middle of the hex flat achieves interference. Interference secures the nut against loosening.




A prevailing torque bolt creates interference at any of the following fastening points:
- Between the threads of the prevailing torque bolt and the threads of the bolt.
- Between the threads of the prevailing torque bolt and the threads of a tapped hole.
The prevailing torque bolt achieves interference in the following ways:
- By permitting distortion of some of its threads during fastening.




By imbedding a nylon patch or nylon adhesive into the bolt threads or the hole threads during fastening. Interference secures the bolt against loosening