A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 6240-00-489-3257
NSN 5975-00-713-5078
NSN 7035-01-420-5404
NSN 5930-01-162-9517
NSN 6110-00-803-4472
NSN 5905-00-588-3477
NSN 6110-00-351-9014
NSN 5925-01-514-6155
NSN 6150-00-293-5293
NSN 6650-01-203-8263
NSN 6135-01-633-8502
NSN 5990-01-029-0868