Material is gunmetal
An item with internal machine threads designed to fit the external machine threads of a tube fitting. It has flat faces, one of which has a counterbored recess to accommodate packing, packing or sealing ring(s), gasket(s), and the like. The item, when installed, provides a method of locking and sealing the connection. See also locknut, pipe; nut (1), tube coupling and nut (1), plain, hexagon.
NSN 6320-01-519-0916
NSN 6650-01-561-9223
NSN 6135-01-353-3802
NSN 6145-01-431-8803
NSN 6240-01-191-5643
NSN 5975-01-032-1616
NSN 5965-01-015-5885
NSN 5999-01-408-4364
NSN 6240-00-223-9107
NSN 5950-01-359-5465
NSN 5920-01-415-0153
NSN 5920-01-068-5846