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 6685-00-787-8594
NSN 5965-01-449-1855
NSN 5985-00-470-4260
NSN 2925-01-221-2522
NSN 2925-01-384-4139
NSN 6130-01-104-4371
NSN 5935-01-391-9043
NSN 5965-01-265-6814
NSN 5998-01-530-7209
NSN 5990-00-133-7734
NSN 5905-00-260-0125
NSN 5920-01-042-9351