A cylindrical-shaped nut, the end opposite the bearing surface being designed with an internal socket or splines for use with an inserted wrench.
NSN 6130-01-644-6473
NSN 6645-01-286-1924
NSN 5855-01-579-1555
NSN 5935-00-566-5940
NSN 5910-01-531-5980
NSN 6110-01-199-5024
NSN 5925-01-588-5108
NSN 5925-01-257-3017
NSN 6685-01-502-9028
NSN 2925-00-169-3775
NSN 6105-01-348-5902
NSN 5895-01-427-3727