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 6130-01-500-9480
NSN 5920-00-958-7202
NSN 5985-01-193-0464
NSN 6135-01-014-9755
NSN 6650-00-857-2260
NSN 5915-01-086-2283
NSN 5930-00-106-8956
NSN 5960-00-199-6034
NSN 5996-00-824-5943
NSN 5945-00-162-5950
NSN 5920-01-293-5982
NSN 5920-01-167-0810