Same size for 1, 1.5, and 2 ton, probably same as 3/4 ton too?
When you get new ones drive them with a hammer and punch, then install lock washer and nut and tighten just a little more than necessary to squish the washer.
Same trick works on kink pin lock bolts.
They seem to be soft enough that they break before pulling home with the nut, so set them with a hammer and punch, don't try to force them with the nut.
Grigg
