Pipe end has an insert in it
A fitting that forms an angle of less than 180 degrees (3.142 radians) from the straight flow. One connecting end has standard pipe threads, or is unthreaded and designed to accommodate a pipe. The other end has 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; elbow, tube; 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 6685-01-267-1861
NSN 6220-00-500-8555
NSN 6240-01-067-6457
NSN 5895-00-835-4806
NSN 5965-00-716-7078
NSN 5895-01-066-1684
NSN 6130-00-241-5144
NSN 5945-01-098-5319
NSN 6145-01-413-7410
NSN 5920-01-634-0250
NSN 6650-01-303-7964
NSN 5985-01-104-6993