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 5965-01-241-9865
NSN 4140-01-408-5132
NSN 5985-00-177-7225
NSN 6105-01-408-3598
NSN 6645-01-432-7026
NSN 5920-01-170-5997
NSN 6130-01-375-2217
NSN 6320-01-436-0513
NSN 2925-01-151-6969
NSN 6145-00-497-1578
NSN 6650-01-406-1828
NSN 6130-01-295-6627