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 6145-01-200-2176
NSN 6645-00-654-8804
NSN 7035-01-531-6554
NSN 6685-01-474-4949
NSN 5998-01-168-1366
NSN 6320-01-119-3935
NSN 6150-01-494-8380
NSN 5895-00-714-7982
NSN 5855-00-228-8446
NSN 5915-01-563-3412
NSN 5950-01-169-8231
NSN 5945-01-629-9492