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 5985-01-602-8398
NSN 5925-00-477-2703
NSN 6685-00-634-9964
NSN 6620-01-331-6075
NSN 6130-00-318-3590
NSN 5999-01-634-0576
NSN 6130-00-984-5221
NSN 5935-01-576-1108
NSN 6240-00-765-8443
NSN 2925-01-590-3981
NSN 6150-01-104-4323
NSN 5930-01-433-9984