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 6145-01-444-4509
NSN 5935-00-624-2379
NSN 5910-01-220-4264
NSN 5965-01-530-6565
NSN 5935-00-432-9520
NSN 6150-01-416-0650
NSN 5905-01-429-5188
NSN 5920-00-928-6721
NSN 5999-01-350-2110
NSN 5945-01-650-5316
NSN 5910-00-125-7078
NSN 7035-01-083-0282