Pipe threads are british standard pipe - parallel (bspp); has 19.0 mm hex shaped nut for tightening fitting
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 5990-00-177-2924
NSN 7035-01-113-6492
NSN 5998-01-649-8821
NSN 5835-00-792-8438
NSN 6645-01-118-5300
NSN 2925-00-635-6907
NSN 5965-01-605-0090
NSN 6135-01-547-8936
NSN 5950-00-010-6646
NSN 2925-01-484-8556
NSN 7035-00-888-7440
NSN 5910-00-526-0694