scope:

GENERAL: 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 ESP-E-56.101-GS.

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