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 6320-01-442-8604
NSN 5975-00-322-9865
NSN 5895-01-463-7929
NSN 2925-01-628-7580
NSN 5945-00-185-6609
NSN 6135-01-329-7994
NSN 5985-01-323-6650
NSN 5985-00-177-3605
NSN 6240-01-502-7883
NSN 5910-00-802-1778
NSN 6320-00-506-2314
NSN 6105-00-353-8153