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 5990-01-246-7417
NSN 6610-01-409-1781
NSN 5999-01-383-1519
NSN 5835-00-327-3314
NSN 6610-00-553-5103
NSN 6240-01-560-3370
NSN 6150-00-652-1140
NSN 5920-01-484-9339
NSN 5835-01-460-6054
NSN 5985-01-512-1486
NSN 7035-01-277-8959
NSN 6145-01-209-0842