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 6105-01-056-8963
NSN 6220-01-066-5529
NSN 6320-01-549-7201
NSN 6130-01-349-0564
NSN 6685-01-438-6747
NSN 5930-01-248-8442
NSN 5910-01-299-4365
NSN 4140-00-468-5342
NSN 5965-00-716-7078
NSN 5950-01-459-4452
NSN 5920-01-371-0550
NSN 5835-01-644-4958