A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 5910-01-538-2003
NSN 6220-00-406-5045
NSN 5999-01-340-7148
NSN 5998-01-069-6313
NSN 6150-00-296-2361
NSN 5935-01-242-5139
NSN 5935-00-211-9061
NSN 5930-01-634-0659
NSN 5920-01-174-8540
NSN 6130-01-071-9293
NSN 5996-01-257-2517
NSN 6650-01-116-9731