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 6240-01-441-3388
NSN 4140-00-100-4563
NSN 6110-00-805-5529
NSN 6110-00-419-4475
NSN 5925-00-960-5214
NSN 5835-01-184-6878
NSN 5960-00-864-7673
NSN 5920-00-063-0532
NSN 7035-00-946-2642
NSN 5855-01-165-6361
NSN 5945-00-718-6522
NSN 6130-01-463-9368