A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 5945-01-068-6752
NSN 5998-00-299-7891
NSN 6135-01-247-5660
NSN 5960-00-285-1001
NSN 6150-00-166-5777
NSN 6320-01-228-2380
NSN 6645-01-535-7136
NSN 5945-01-435-2679
NSN 5990-00-054-4785
NSN 5930-00-557-0727
NSN 6110-01-158-6138
NSN 6135-00-299-6918