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 5945-01-585-8129
NSN 6110-01-416-2370
NSN 5965-01-227-8936
NSN 6610-01-274-2479
NSN 6240-00-316-3167
NSN 6130-00-165-9311
NSN 5895-01-648-5157
NSN 5985-01-329-0324
NSN 5960-01-265-0354
NSN 6610-01-222-0582
NSN 5935-01-238-9075
NSN 5895-01-287-9443