A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 5920-00-149-1469
NSN 5945-01-185-3020
NSN 6110-00-111-4055
NSN 6110-01-552-7732
NSN 6110-00-660-8998
NSN 6645-01-229-3369
NSN 5945-01-540-3054
NSN 6240-00-486-8447
NSN 6135-01-496-5810
NSN 5930-01-451-5554
NSN 7035-01-263-5463
NSN 5915-01-596-1712