A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 6685-01-068-1600
NSN 5960-01-443-3067
NSN 6620-01-619-9263
NSN 5996-00-161-4202
NSN 5965-01-303-6105
NSN 5999-01-544-6500
NSN 5945-00-060-6862
NSN 5990-01-633-9503
NSN 6135-01-408-9244
NSN 6130-00-782-0353
NSN 6320-01-111-8851
NSN 6645-00-581-9239