Prevailing Torque Fasteners: Identification

WARNING: This page is about a different car, the 2021 Chevrolet Tahoe and 2021 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.

Courtesy of GENERAL MOTORS COMPANY

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:

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

Application	Specification
Application	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
Application	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