A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 6240-00-936-2056
NSN 5990-00-306-0222
NSN 5998-01-496-3194
NSN 5905-00-195-2014
NSN 6130-00-964-9083
NSN 5999-00-961-6108
NSN 5895-01-393-5443
NSN 6135-00-231-7257
NSN 6150-01-423-1432
NSN 5920-01-464-0091
NSN 6110-01-150-8109
NSN 6105-01-264-1297