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 6110-01-386-8439
NSN 6220-01-221-9429
NSN 5950-01-338-0715
NSN 6320-01-086-2602
NSN 5999-00-506-7835
NSN 6150-01-604-5991
NSN 5996-00-964-5229
NSN 5915-00-665-2854
NSN 5965-00-481-4662
NSN 5905-00-526-9582
NSN 6320-01-125-3361
NSN 6240-01-199-0367