A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 6645-00-163-9580
NSN 5835-00-373-2671
NSN 5965-01-236-4076
NSN 6240-01-224-6941
NSN 5905-01-297-8570
NSN 5920-01-443-3771
NSN 6645-01-426-8621
NSN 5925-00-636-5683
NSN 5935-00-475-3143
NSN 5960-00-553-7338
NSN 6135-01-199-1185
NSN 6150-01-500-1221