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General Information: Specifications Chevrolet Spark M300

Hoist/jack 1 illustration ~174 words

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.

Scheme 1

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

A prevailing torque fastener may be reused ONLY if

  1. The fastener and the fastener counterpart are clean and not damaged
  2. There is no rust on the fastener
  3. The fastener develops the specified minimum torque against its counterpart prior to the fastener seating
ApplicationSpecification
MetricEnglish
All Metal Prevailing Torque Fasteners
6 mm0.4 N.m4 lb in
8 mm0.8 N.m7 lb in
10 mm1.4 N.m12 lb in
12 mm2.1 N.m19 lb in
14 mm3 N.m27 lb in
16 mm4.2 N.m37 lb in
20 mm7 N.m62 lb in
24 mm10.5 N.m93 lb in
Nylon Interface Prevailing Torque Fasteners
6 mm0.3 N.m3 lb in
8 mm0.6 N.m5 lb in
10 mm1.1 N.m10 lb in
12 mm1.5 N.m13 lb in
14 mm2.3 N.m20 lb in
16 mm3.4 N.m30 lb in
20 mm5.5 N.m49 lb in
24 mm8.5 N.m75 lb in

Metric Prevailing Torque Fastener Minimum Torque Development

ApplicationSpecification
MetricEnglish
All Metal Prevailing Torque Fasteners
1/4 in0.5 N.m4.5 lb in
5/16 in0.8 N.m7.5 lb in
3/8 in1.3 N.m11.5 lb in
7/16 in1.8 N.m16 lb in
1/2 in2.3 N.m20 lb in
9/16 in3.2 N.m28 lb in
5/8 in4 N.m36 lb in
3/4 in7 N.m54 lb in
Nylon Interface Prevailing Torque Fasteners
1/4 in0.3 N.m3 lb in
5/16 in0.6 N.m5 lb in
3/8 in1 N.m9 lb in
7/16 in1.3 N.m12 lb in
1/2 in1.8 N.m16 lb in
9/16 in2.5 N.m22 lb in
5/8 in3.4 N.m30 lb in
3/4 in5 N.m45 lb in

English Prevailing Torque Fastener Minimum Torque Development

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