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 5996-01-532-9872
NSN 6650-01-608-4820
NSN 5975-01-523-5623
NSN 6645-00-658-7838
NSN 5945-01-303-6361
NSN 6240-00-391-6402
NSN 5895-01-113-6575
NSN 5920-01-432-7962
NSN 5965-01-550-7505
NSN 5895-01-565-8786
NSN 5945-01-275-5904
NSN 4140-01-016-3143