A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 5960-01-249-7617
NSN 6150-01-430-0332
NSN 6650-01-486-7221
NSN 5960-01-253-6687
NSN 6650-01-165-2175
NSN 5998-01-452-2912
NSN 5895-01-605-1653
NSN 6145-01-492-5642
NSN 5985-01-151-2278
NSN 5975-01-253-3999
NSN 6135-00-613-1068
NSN 6130-01-337-0612