A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 6645-01-157-9080
NSN 6240-01-045-9269
NSN 6130-01-062-8553
NSN 5925-01-562-4897
NSN 6685-01-417-8818
NSN 6105-00-900-3784
NSN 6240-01-324-6569
NSN 6135-00-209-6918
NSN 6105-01-586-0341
NSN 5996-01-305-8812
NSN 6610-01-112-8137
NSN 5855-01-046-7273