Wall tolerance applies to ends only, end preparation per ansi b16.25
A fitting that forms an angle of less than 180 degrees (3.141 radians) from a straight flow. Both connecting ends have machine threads (straight threads other than pipe or hose series) designed to accommodate a tube or is unthreaded and designed to accommodate a tube. It may have side or heel inlet(s). See also elbow, pipe and connector, multiple, fluid pressure line.
Classification: Threaded elbows and bends of iron or steel (other than cast iron or stainless steel) for pipes and tubes
NSN 6650-01-621-2891
NSN 6130-00-193-2421
NSN 6620-01-372-4168
NSN 6610-01-517-8652
NSN 6650-01-583-1215
NSN 6685-01-456-3717
NSN 5990-01-529-6347
NSN 5975-00-122-2429
NSN 6135-00-628-1142
NSN 6610-01-459-8722
NSN 5930-01-628-0323
NSN 6110-01-382-9706