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 4140-01-123-0262
NSN 5835-00-921-1662
NSN 5996-00-825-7240
NSN 6620-01-152-6837
NSN 6220-00-977-8839
NSN 6135-00-913-2062
NSN 6645-01-265-8729
NSN 6650-01-449-3865
NSN 5925-01-545-0562
NSN 6645-01-480-3962
NSN 6685-00-549-9784
NSN 5920-01-534-3806