scope:

GENERAL: Implementation of this standard must be in accordance with the policies and procedures outlined in MPAPS S-A-0.101. There may also be supplemental group instructions in regard to use of metric standards that should be taken into account.

This standard may differ in some respects with certain segments of ISO and national standards. In recognition of these possible differences, the sizes and tolerance ranges used were established in an effort to enable the use of commercially available items, dimensionally interchangeable worldwide.

This specification contains elements of the following standards:

American National Standards Institute: 18.16.3M

International Organization for Standardization: ISO 2320, 7042, 7719

Prevailing torque type is a nut which is frictionally resistant to rotation due to a self-contained prevailing torque feature, and not because of a compressive load developed against the bearing surface of the nut.

Prevailing torque is the torque necessary to rotate the nut on its mating externally threaded component, with the torque being measured while the nut is in motion, and with no axial load in the mating component.

Inch series prevailing torque hex nuts - all metal, may be found in MPAPS S-E-56.101-GS/PL.

Letter symbols designating dimensional characteristics are in accord with those used in ANSI and ISO standards.