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 6320-01-191-5036
NSN 5999-01-578-4232
NSN 5965-01-132-1427
NSN 5920-01-593-2489
NSN 2925-01-376-9236
NSN 6620-01-457-9476
NSN 5855-01-267-2751
NSN 5935-01-330-7993
NSN 6130-00-752-2584
NSN 6145-01-299-7871
NSN 5920-01-605-0214
NSN 5935-00-064-7938