A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 5915-01-298-7936
NSN 5975-01-307-6993
NSN 5855-00-198-3197
NSN 6105-00-527-2193
NSN 6610-01-574-9829
NSN 6620-01-034-1697
NSN 6240-01-169-1686
NSN 5905-00-393-2757
NSN 5910-01-127-9205
NSN 5965-01-360-6568
NSN 6650-01-481-7895
NSN 6645-01-439-8368