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 6650-00-016-3676
NSN 5975-01-515-0619
NSN 5915-01-211-4934
NSN 5945-00-611-7265
NSN 6620-01-434-1012
NSN 5925-01-331-8004
NSN 5925-01-411-5222
NSN 5930-01-380-6390
NSN 2925-01-125-9169
NSN 5855-00-631-4565
NSN 6650-00-269-5000
NSN 5920-01-564-4474