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Prevailing Torque Fasteners: Notes

WARNING: This page is about a different car, the 2023 GMC Savana 3500, 2023 GMC Savana 2500, 2023 Chevrolet Express 3500, and 2023 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

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.

GM171892Courtesy of GENERAL MOTORS COMPANY
NOTE: Callouts in the following chart represent components shown in graphic above.
Callout Component Name
1 Prevailing Torque Nut, Center Lock Type
2 Prevailing Torque Nut, Top Lock Type
3 Prevailing Torque Nut, Nylon Patch Type
4 Prevailing Torque Nut, Nylon Washer Insert Type
5 Prevailing Torque Nut, Nylon Insert Type
6 Prevailing Torque Bolt, Dry Adhesive Coating Type
7 Prevailing Torque Bolt, Thread Profile Deformed Type
8 Prevailing Torque Bolt, Nylon Strip Type
9 Prevailing Torque Bolt, Out-of-Round Thread Area Type

A prevailing torque fastener may be reused ONLY if:

Metric Prevailing Torque Fastener Minimum Torque Development

Application Specification
Metric English
All Metal Prevailing Torque Fasteners
  • 6 mm
 0.4 N.m 4 lb in
  • 8 mm
 0.8 N.m 7 lb in
  • 10 mm
 1.4 N.m 12 lb in
  • 12 mm
 2.1 N.m 19 lb in
  • 14 mm
 3 N.m 27 lb in
  • 16 mm
 4.2 N.m 37 lb in
  • 20 mm
 7 N.m 62 lb in
  • 24 mm
 10.5 N.m 93 lb in
Nylon Interface Prevailing Torque Fasteners
  • 6 mm
 0.3 N.m 3 lb in
  • 8 mm
 0.6 N.m 5 lb in
  • 10 mm
 1.1 N.m 10 lb in
  • 12 mm
 1.5 N.m 13 lb in
  • 14 mm
 2.3 N.m 20 lb in
  • 16 mm
 3.4 N.m 30 lb in
  • 20 mm
 5.5 N.m 49 lb in
  • 24 mm
 8.5 N.m 75 lb in
English Prevailing Torque Fastener Minimum Torque Development

Application Specification
Metric English
All Metal Prevailing Torque Fasteners
  • 1/4 in
 0.5 N.m 4.5 lb in
  • 5/16 in
 0.8 N.m 7.5 lb in
  • 3/8 in
 1.3 N.m 11.5 lb in
  • 7/16 in
 1.8 N.m 16 lb in
  • 1/2 in
 2.3 N.m 20 lb in
  • 9/16 in
 3.2 N.m 28 lb in
  • 5/8 in
 4 N.m 36 lb in
  • 3/4 in
 7 N.m 62 lb in
Nylon Interface Prevailing Torque Fasteners
  • 1/4 in
 0.3 N.m 3 lb in
  • 5/16 in
 0.6 N.m 5 lb in
  • 3/8 in
 1 N.m 9 lb in
  • 7/16 in
 1.3 N.m 12 lb in
  • 1/2 in
 1.8 N.m 16 lb in
  • 9/16 in
 2.5 N.m 22 lb in
  • 5/8 in
 3.4 N.m 30 lb in
  • 3/4 in
 5 N.m 45 lb in
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