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 6105-01-491-9617
NSN 5985-00-263-2469
NSN 6105-01-191-6149
NSN 5920-01-631-3203
NSN 5965-00-988-8770
NSN 5920-01-599-1559
NSN 6645-00-269-2764
NSN 5855-00-247-7219
NSN 6135-01-167-7604
NSN 6240-00-155-7900
NSN 6240-00-155-7900
NSN 6220-01-574-3669