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 6320-00-300-5556
NSN 6645-01-601-1707
NSN 5930-01-238-8597
NSN 5975-00-283-3665
NSN 5999-00-227-3931
NSN 6685-00-256-6591
NSN 6145-00-695-9568
NSN 6135-01-068-0119
NSN 5925-01-217-8406
NSN 5950-01-317-3552
NSN 6650-00-597-7313
NSN 5935-01-225-4253