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 6130-01-487-4049
NSN 5910-01-436-8798
NSN 5905-00-516-0814
NSN 5998-01-100-1116
NSN 5855-01-063-6340
NSN 5920-01-168-7810
NSN 5945-00-251-3915
NSN 5985-01-371-3067
NSN 6150-01-338-7228
NSN 5965-00-079-2360
NSN 5975-01-509-1478
NSN 6130-01-415-3345