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 5999-01-412-9255
NSN 5925-01-175-5059
NSN 5950-01-013-3201
NSN 6220-00-956-0565
NSN 5985-01-323-3922
NSN 5925-01-106-2086
NSN 6240-01-143-8976
NSN 4140-01-420-8370
NSN 5855-01-607-6521
NSN 5985-01-256-6544
NSN 5920-01-408-6800
NSN 5935-01-590-6752