National Item Identification Number
National Stock Number
Federal Supply Class
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.
Commercial and Government Entity Code (Supplier Data)
Reference Numbers (Part Numbers)
COPPER ALLOY OVERALL
A391 TUBE FITTING LOCKNUT