A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 6620-01-552-4980
NSN 5975-01-145-3768
NSN 5965-01-537-0023
NSN 5996-00-247-3808
NSN 7035-01-463-3368
NSN 5990-00-015-3907
NSN 5930-01-227-7857
NSN 5975-01-027-4079
NSN 6645-00-711-5381
NSN 6610-00-401-2601
NSN 5999-00-058-0612
NSN 5855-01-485-4327