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 6135-01-658-7467
NSN 5925-00-876-1042
NSN 6320-00-261-9136
NSN 5999-00-073-6658
NSN 5950-01-111-9538
NSN 6145-00-174-4862
NSN 6145-01-104-5084
NSN 6685-01-651-2294
NSN 5950-00-819-7299
NSN 5910-01-165-1882
NSN 5990-01-069-0365
NSN 6135-01-274-3546