A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 6130-00-079-9342
NSN 5935-01-541-4969
NSN 5950-01-542-0244
NSN 6135-01-532-7951
NSN 5915-01-133-3683
NSN 5998-01-573-7032
NSN 7035-00-371-7749
NSN 6130-00-147-3091
NSN 5990-01-503-0194
NSN 5925-00-432-0546
NSN 6110-00-469-2517
NSN 4140-01-068-0140