Prevailing Torque Fasteners

Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening.

All Metal Prevailing Torque Fasteners

These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener.

Nylon Interface Prevailing Torque Fasteners

These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads.

Adhesive Coated Fasteners

These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener.

1. 1
   Prevailing Torque Nut, Center Lock Type
2. 2
   Prevailing Torque Nut, Top Lock Type
3. 3
   Prevailing Torque Nut, Nylon Patch Type
4. 4
   Prevailing Torque Nut, Nylon Washer Insert Type
5. 5
   Prevailing Torque Nut, Nylon Insert Type
6. 6
   Prevailing Torque Bolt, Dry Adhesive Coating Type
7. 7
   Prevailing Torque Bolt, Thread Profile Deformed Type
8. 8
   Prevailing Torque Bolt, Nylon Strip Type
9. 9
   Prevailing Torque Bolt, Out-of-Round Thread Area Type

A prevailing torque fastener may be reused ONLY if:

• The fastener and the fastener counterpart are clean and not damaged
• There is no rust on the fastener
• The fastener develops the specified minimum torque against its counterpart prior to the fastener seating

Metric Prevailing Torque Fastener Minimum Torque Development

English Prevailing Torque Fastener Minimum Torque Development