A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 6645-00-862-2904
NSN 5996-00-926-7806
NSN 6240-00-133-1652
NSN 5925-01-064-9884
NSN 6135-01-433-2062
NSN 6130-00-253-5910
NSN 5930-01-356-1364
NSN 6220-01-349-0486
NSN 5935-00-288-5973
NSN 5910-01-381-1480
NSN 5920-01-281-6466
NSN 6240-01-642-9552