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 5935-01-095-3459
NSN 5920-01-123-9854
NSN 6685-01-604-9278
NSN 5999-00-495-9209
NSN 6150-00-248-0063
NSN 5935-01-642-5726
NSN 5990-01-168-0820
NSN 6240-00-984-6257
NSN 5920-00-848-0264
NSN 5915-01-115-1996
NSN 5975-00-420-8986
NSN 5915-01-351-2348