What is the nut size on a Kawasaki KX 250 swingarm bolt?

Im rebuilding my kx 250 2001 and have seemed to have misplaced the nut on the swingarm bolt/screw….what is the size of that nut so that i can replace it….my local dealer has the whole bolt assembly, but takes 8 days to get it. I wana ride! Can anyone help?