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 5985-01-041-0586
NSN 7035-01-356-4025
NSN 2925-01-208-6638
NSN 5960-01-205-6629
NSN 5925-01-619-6551
NSN 6220-01-280-8458
NSN 5975-00-710-1902
NSN 5855-01-381-7493
NSN 6610-00-871-7468
NSN 5998-01-370-7718
NSN 5895-00-246-1648
NSN 5950-01-525-8127