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 4140-00-490-0630
NSN 5920-00-860-0456
NSN 5855-01-100-3272
NSN 5990-01-042-1984
NSN 6105-00-608-0749
NSN 5998-01-378-7311
NSN 5935-01-074-3093
NSN 6105-00-233-7312
NSN 6110-01-411-6660
NSN 6135-01-300-8338
NSN 6320-01-445-8192
NSN 6240-01-433-9410