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 6645-01-308-9349
NSN 5905-00-474-8941
NSN 5990-00-683-1095
NSN 6135-01-400-2947
NSN 5999-01-084-4087
NSN 6685-00-028-6865
NSN 5915-01-481-3489
NSN 5915-01-593-8937
NSN 5996-01-462-5332
NSN 6220-00-896-4907
NSN 5999-01-460-4368
NSN 5895-01-178-5876