A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 5910-01-042-4454
NSN 5998-01-369-7775
NSN 6130-01-025-6770
NSN 5965-01-483-7244
NSN 5910-01-535-4588
NSN 5945-01-330-3020
NSN 5935-01-389-3614
NSN 5998-01-028-2968
NSN 5905-01-469-7567
NSN 5895-00-951-3995
NSN 6135-01-592-4139
NSN 6610-01-516-2442