A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 6220-01-486-3320
NSN 6130-00-488-4656
NSN 5925-01-174-0335
NSN 6620-01-333-7014
NSN 5945-01-012-5388
NSN 4140-01-643-1434
NSN 5910-01-572-9036
NSN 6685-01-212-9607
NSN 5925-00-720-1354
NSN 6135-01-205-5965
NSN 5915-01-398-3524
NSN 4140-01-441-1307