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 5996-00-279-5806
NSN 6645-01-180-6219
NSN 5855-00-149-0766
NSN 6135-00-145-8884
NSN 5975-01-444-9262
NSN 2925-00-132-1280
NSN 5960-00-949-1553
NSN 5895-01-067-7957
NSN 5835-00-707-6266
NSN 6135-01-025-8109
NSN 5998-01-481-3907
NSN 5960-01-658-9538