A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 6685-01-437-6426
NSN 5895-00-940-8646
NSN 6620-01-519-2628
NSN 6150-01-507-4200
NSN 6240-01-530-3554
NSN 5855-01-228-0942
NSN 6645-00-715-1531
NSN 5930-01-533-3784
NSN 2925-00-932-6262
NSN 5975-00-850-6809
NSN 5945-01-489-5519
NSN 6610-01-385-8527