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 7035-01-627-3521
NSN 5910-01-265-7669
NSN 6220-01-542-4180
NSN 7035-00-252-7467
NSN 6620-00-989-8692
NSN 5935-00-866-1573
NSN 6610-01-142-8958
NSN 5960-00-751-1547
NSN 5835-01-644-8013
NSN 4140-00-022-9054
NSN 6110-00-690-2026
NSN 6620-00-197-5130