A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 5895-01-393-4148
NSN 5965-01-381-2527
NSN 6650-01-171-0779
NSN 6320-00-466-0371
NSN 6610-01-282-6747
NSN 5905-00-224-0744
NSN 6320-01-495-1244
NSN 6145-00-174-9344
NSN 5975-01-554-1289
NSN 5960-01-201-6316
NSN 5905-00-212-8802
NSN 6110-00-065-4742