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 5895-01-411-6024
NSN 6610-01-555-8791
NSN 5920-01-419-0310
NSN 5905-01-256-4160
NSN 5950-01-400-2977
NSN 6105-01-321-0936
NSN 5990-01-160-6978
NSN 5930-01-014-6742
NSN 5905-01-189-9097
NSN 5985-01-574-6767
NSN 7035-01-119-6271
NSN 5950-01-540-7949