A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 5975-01-257-1220
NSN 6620-01-633-8443
NSN 5910-00-540-7834
NSN 6650-00-316-0260
NSN 6645-00-073-9949
NSN 5915-01-619-3585
NSN 5999-01-011-5986
NSN 6610-01-494-6319
NSN 5935-01-447-2835
NSN 5945-01-634-0588
NSN 6130-01-504-5128
NSN 5965-01-440-1213