A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 5855-01-410-8979
NSN 6610-01-391-5092
NSN 6135-00-196-5267
NSN 5960-01-254-0647
NSN 6610-00-740-7103
NSN 6240-01-507-1362
NSN 5990-01-591-8797
NSN 6110-01-530-3056
NSN 5905-00-881-0899
NSN 7035-00-753-0695
NSN 6645-01-061-5516
NSN 5998-00-146-3853