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 6645-00-402-5622
NSN 5895-00-596-8678
NSN 6240-01-478-8488
NSN 5945-01-167-8498
NSN 5935-01-182-9634
NSN 5905-01-288-6565
NSN 6220-00-869-6988
NSN 5960-00-412-0566
NSN 5999-00-481-9864
NSN 5905-01-186-0625
NSN 6620-01-517-0014
NSN 6110-00-525-3418