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 4140-01-029-2814
NSN 5935-00-456-3450
NSN 5960-01-092-4762
NSN 5945-01-114-5518
NSN 5975-00-528-9774
NSN 6610-01-624-2561
NSN 6110-00-477-0006
NSN 5945-00-137-4379
NSN 7035-01-565-2740
NSN 6130-01-326-9219
NSN 5935-01-281-5342
NSN 6220-01-607-6154