A nut having 12 drive points and 24 sides. The bearing surface may be washer faced. An integral locking feature is incorporated in the design of the head or in the threads.
NSN 6650-01-399-8552
NSN 6610-01-323-7045
NSN 4140-00-420-0251
NSN 6145-01-581-1074
NSN 5925-00-973-1160
NSN 6220-00-901-8639
NSN 6220-01-237-6776
NSN 6220-01-335-6071
NSN 5920-01-017-5438
NSN 5925-00-466-6934
NSN 5999-00-402-7788
NSN 6650-00-304-6987