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 6620-01-031-8180
NSN 6685-01-189-2377
NSN 6135-00-676-5807
NSN 6135-01-589-9467
NSN 5950-00-353-5382
NSN 6135-01-069-8575
NSN 5920-01-140-1120
NSN 6610-01-352-5500
NSN 5855-01-348-4623
NSN 6240-01-643-1262
NSN 6130-00-045-9897
NSN 5998-00-815-1896