A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 4140-01-193-8102
NSN 6610-01-031-5672
NSN 6150-01-004-3105
NSN 5985-01-366-2503
NSN 5925-01-641-2643
NSN 5920-00-199-4019
NSN 7035-01-202-8172
NSN 7035-00-179-3924
NSN 6135-01-071-4923
NSN 7035-01-378-9325
NSN 5835-01-476-8210
NSN 6610-01-309-5361