GMNA GM9084P Test for Prevailing Torque Nuts

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GMNA GM9084P Document Information:

Title
Test for Prevailing Torque Nuts

General Motors North America

Publication Date:
Mar 1, 2007

Scope:

Note: Nothing in this standard supersedes applicable laws and regulations.

Note: In the event of conflict between the English and domestic language, the English language shall take precedence.

Purpose.

This standard provides a method for evaluating certain performance characteristics of prevailing torque type nuts.

Foreword.

Not applicable.

Applicability.

The test consists of one installation and one removal of the nut in a test machine using a constant speed nutrunner. For the test, the nut is assembled on a phosphate and oil coated bolt of a grade or property class corresponding to the nut, and a zinc plated test washer is used as the bearing surface. During the installation and removal, three quantities are measured and recorded electronically: (1) prevailing torque on, (2) torque at specified tension, and (3) prevailing torque off.

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