The first end thread type is jic.
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 5930-01-227-2573
NSN 6240-01-126-9167
NSN 5996-01-352-4904
NSN 5895-01-442-2688
NSN 5920-01-257-9549
NSN 6145-01-331-7799
NSN 5905-00-845-4768
NSN 5910-01-471-4504
NSN 5895-01-301-2556
NSN 6220-01-441-2249
NSN 5960-01-407-1350
NSN 5835-00-368-4182