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 5905-00-209-0394
NSN 4140-01-426-8428
NSN 5945-01-391-6289
NSN 6105-01-427-8439
NSN 5960-01-167-8796
NSN 5935-00-809-3891
NSN 5935-01-658-3824
NSN 5915-00-276-8332
NSN 5935-01-386-0568
NSN 6685-01-460-7032
NSN 7035-01-256-1440
NSN 5895-01-260-9510