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 5998-01-317-9400
NSN 6685-00-084-3736
NSN 6610-01-296-4462
NSN 6105-01-303-7476
NSN 5930-00-187-7762
NSN 5965-01-587-8444
NSN 5925-01-349-3081
NSN 5910-01-335-8924
NSN 5996-00-194-6532
NSN 5965-01-507-4318
NSN 5910-00-797-1600
NSN 6645-00-454-0930