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 5998-01-392-3866
NSN 5905-01-588-5852
NSN 6610-01-112-0447
NSN 6220-01-419-7146
NSN 5990-00-473-1809
NSN 7035-01-106-3476
NSN 4140-00-914-7949
NSN 5990-01-339-5118
NSN 4140-01-621-6642
NSN 5950-01-642-0148
NSN 6320-01-631-7828
NSN 6650-01-221-0034