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 6650-01-186-2426
NSN 5930-00-562-9545
NSN 5905-01-431-2474
NSN 6105-01-360-9624
NSN 5945-00-189-4534
NSN 6130-00-429-7544
NSN 5920-00-584-4592
NSN 7035-01-449-6108
NSN 5975-01-606-6938
NSN 5965-01-364-0334
NSN 6145-00-553-8196
NSN 6150-00-779-5547