A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 4140-01-479-3944
NSN 6220-00-840-0209
NSN 5975-01-552-1172
NSN 6610-01-431-8575
NSN 5950-00-200-1110
NSN 5925-01-088-6863
NSN 6130-00-170-4844
NSN 4140-01-449-9037
NSN 5975-01-167-8515
NSN 6685-01-222-0141
NSN 6240-01-318-1522
NSN 5910-01-592-3861