A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 6685-00-547-6218
NSN 6110-01-020-8153
NSN 5965-00-977-5658
NSN 5915-01-413-1118
NSN 5930-00-405-1421
NSN 6145-01-528-4181
NSN 5996-01-227-2555
NSN 6135-01-598-9889
NSN 5910-01-481-0047
NSN 5895-01-571-2272
NSN 6645-01-509-3221
NSN 4140-00-773-6474