A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 6145-00-827-4958
NSN 5945-00-823-5672
NSN 5935-00-695-4914
NSN 5998-01-532-6120
NSN 6240-01-145-3931
NSN 6645-00-974-2502
NSN 5930-01-509-4583
NSN 4140-01-112-8550
NSN 4140-01-052-1378
NSN 5935-01-350-4325
NSN 5990-01-128-3758
NSN 6610-00-691-4698