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 6220-01-330-8238
NSN 6240-00-959-4952
NSN 5920-00-736-7882
NSN 6135-00-728-9860
NSN 5945-01-207-1732
NSN 5910-01-377-9956
NSN 5960-01-344-2604
NSN 6105-00-116-9717
NSN 6685-01-287-6181
NSN 6110-01-210-9810
NSN 5910-01-574-3732
NSN 5915-01-048-1509