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 6130-01-480-4081
NSN 6650-01-044-6377
NSN 2925-01-191-5442
NSN 6645-01-067-4081
NSN 5915-01-509-5410
NSN 5960-00-140-9583
NSN 5895-00-470-4854
NSN 5920-01-466-1485
NSN 5930-01-094-8114
NSN 5855-00-156-5489
NSN 5835-01-481-4204
NSN 5910-00-353-6649