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 5945-01-026-9393
NSN 6145-01-070-1248
NSN 6145-00-727-1503
NSN 5975-01-555-7238
NSN 5915-00-571-9491
NSN 5935-00-623-8256
NSN 5996-01-198-9680
NSN 5945-01-432-4118
NSN 6135-00-753-2276
NSN 5998-00-276-3222
NSN 5835-00-286-5432
NSN 6150-00-719-6119