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 5965-01-384-7670
NSN 5960-00-683-7476
NSN 4140-01-015-9283
NSN 6650-01-649-0228
NSN 6685-01-601-8144
NSN 5895-01-211-6807
NSN 5935-01-391-5298
NSN 5996-00-138-9938
NSN 6685-01-190-4356
NSN 6620-00-199-8734
NSN 5990-00-101-8318
NSN 6130-01-648-2672