This specification covers packings and gaskets intended for use at a temperature range of −65° to 160°F in hydraulic systems in accordance with Specification MIL-P-5514, MIL-H-5440, and shock absorbers. These rings should not be used in conjunction with any hydraulic fluid other than that conforming to Specification MIL-H-5606, unless otherwise specified by the procuring activity.

V-ring, class A packings, and O-ring, class B packings, are intended for use in shock absorber struts, actuating cylinders, valves, and in all parts of hydraulic mechnisms with operating pressure of from 0 to 1,500 psi, except that O-rings can be used at higher pressures in accordance with Specification MIL-P-5514.

U-cup-type packings of class B material for use in hydraulic systems, brake cylinders, brake valves, and other similar mechanisms must be made of suitable compounds and tested by the user of the cups to the applicable requirements of this specification, except that tests will be made in the individual units for which the cups were designed, under normal operating pressures and representative conditions, including extreme temperature requirements.

D-ring-type packings are intended for use in landing gear shock strut as rod seal only.

(See Specification MIL-P-5514).