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 2925-01-552-7151
NSN 5965-01-541-0879
NSN 5990-01-140-5497
NSN 5999-00-246-3458
NSN 5960-00-443-1483
NSN 5998-00-390-7694
NSN 5950-00-678-0513
NSN 6320-01-489-6044
NSN 6620-01-565-6352
NSN 6650-01-455-8923
NSN 6320-00-108-7049
NSN 5915-00-733-3694