A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 6620-00-482-1073
NSN 6650-00-924-3340
NSN 5925-01-643-2081
NSN 6135-01-230-4399
NSN 5855-01-070-8084
NSN 5990-00-889-5468
NSN 5985-00-965-9413
NSN 6145-01-502-5489
NSN 6145-01-301-7908
NSN 5985-01-352-9477
NSN 6645-00-806-6961
NSN 6645-01-331-0774