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 5990-01-564-6173
NSN 5925-00-892-1115
NSN 5855-00-494-9581
NSN 7035-00-055-9778
NSN 5975-01-372-2389
NSN 5895-01-425-1759
NSN 2925-01-270-1124
NSN 6135-00-932-3136
NSN 5920-00-973-8366
NSN 6620-01-438-0415
NSN 5985-00-830-0887
NSN 4140-01-101-9946