As differentiated by quality control iaw mil-q-9858
A fluid line fitting having a pipe, tube or hose connection or a through hole to accommodate a bolt, fluid passage on one end. The other end must have an external or internal thread for connecting a mating part to form a self-sealing coupling assembly. The fitting has either a self-sealing feature for the purpose of automatically shutting off the flow of fluid when disconnected from its mating half, or, if it has no self-sealing feature, is specifically designed to mate with a fitting with a self-sealing feature. For self-sealing fittings with a quick disconnect end, see coupling half, quick disconnect. For fluid line fittings without a self-sealing feature, see coupling (as modified).
NSN 5985-01-607-1294
NSN 6240-01-349-6320
NSN 4140-01-284-5722
NSN 5910-00-269-4755
NSN 5985-01-268-2961
NSN 5960-01-334-5146
NSN 5985-00-800-1629
NSN 5855-01-371-1010
NSN 5835-00-465-3762
NSN 5998-00-148-6982
NSN 4140-01-437-6794
NSN 5960-01-564-5044