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 5925-01-028-5735
NSN 6240-00-545-8310
NSN 6240-01-633-9357
NSN 6220-00-332-5859
NSN 5910-01-500-1977
NSN 6645-01-367-2581
NSN 6150-01-301-1102
NSN 5950-01-224-7133
NSN 6645-00-960-6594
NSN 6145-01-553-4422
NSN 6220-01-426-4360
NSN 5920-00-071-9241