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 5998-01-374-0190
NSN 5910-00-203-5856
NSN 5905-01-014-1415
NSN 6145-00-451-6651
NSN 7035-00-153-3826
NSN 6110-01-399-8148
NSN 6650-01-360-3848
NSN 6240-00-141-6143
NSN 5985-01-296-5539
NSN 6620-01-219-5722
NSN 6650-01-592-4057
NSN 5925-01-114-7586