Conform to asa standard b16.5
An item solid or split into halves, having a threaded or unthreaded hole for the purpose of connecting or retaining a pipe, tube, or hose fitting. The face of the flange may be smooth, grooved, or serrated and may be drilled for connecting bolts or studs. If the item is unthreaded, the pipe or tube may be retained by welding, brazing, compression, or the like. Excludes flange, pipe, blind; ferrule, grooved clamp coupling; and adapter (as modified).
Classification: Flanges of iron or nonalloy steel
NSN 4140-01-579-3686
NSN 5990-01-147-5225
NSN 6685-01-394-4141
NSN 7035-00-054-3414
NSN 5935-01-105-0738
NSN 6645-01-415-3341
NSN 5920-00-267-3109
NSN 5925-01-644-5658
NSN 6645-01-149-6849
NSN 5930-00-765-2171
NSN 6650-00-161-4122
NSN 4140-00-122-6422