A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 5855-00-149-0766
NSN 5920-00-888-7737
NSN 5999-01-623-3912
NSN 5905-01-459-8151
NSN 5855-00-466-2309
NSN 6135-01-190-2628
NSN 6150-01-568-0279
NSN 5998-01-073-1595
NSN 6610-01-361-9988
NSN 6110-00-138-8687
NSN 5935-00-716-7122
NSN 5990-01-591-8797