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 6650-01-242-8922
NSN 5935-01-527-4413
NSN 5835-00-238-1516
NSN 5905-00-988-1645
NSN 6105-00-919-8466
NSN 6220-01-267-9843
NSN 5998-01-450-7413
NSN 6145-01-545-4784
NSN 6320-01-478-9351
NSN 5920-00-527-9473
NSN 5950-01-141-7635
NSN 6145-01-360-6707