Both ends 0.531 in drill
No other part numbers with same form, fit, and function found.
An adapter having standard pipe threads on one end or an unthreaded end 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 is designed to join a pipe or pipe fitting to a tube or tube fitting in a straight line.
NSN 5996-01-386-2843
NSN 6320-00-456-0836
NSN 5998-00-732-0492
NSN 2925-00-928-5931
NSN 6135-01-597-7685
NSN 5835-01-631-7390
NSN 6645-01-086-3411
NSN 6240-00-127-7874
NSN 6150-00-297-3928
NSN 5935-01-164-5322
NSN 5998-01-010-4504
NSN 6130-01-440-9008