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 5920-01-348-2234
NSN 6650-00-398-1821
NSN 2925-01-510-9378
NSN 5998-01-365-8990
NSN 6150-01-089-6764
NSN 5950-01-514-5159
NSN 6110-01-068-3982
NSN 5990-00-106-3932
NSN 5920-01-514-4095
NSN 5895-01-099-6258
NSN 5910-00-188-9624
NSN 6320-00-456-2092