It goes by shank diameter. A 1" shank diameter uses a 1.5" nut and a 1.25" shank uses a 1 7/8" nut.
If I remember, the torque on the 1" shank is 250 FT LB and the torque on the 1.25" shank is 450 FT LB...
Unless you've got a monster torque wrench with a torque multiplier, you'd be better off taking it to a trailer repair shop or a heavy equipment repair shop to get it torqued. Most people don't have any tools nearly heavy enough to torque the ball/nut. When you look at the lock nut that is on the bottom of the shank, you'll see why torque is so important. If you don't get it tight enough, the lock nut won't even be compressed flat....
Yup, I remembered correctly. Here's the Drawtite link:
http://www.draw-tite.com/content/pro...ID=1210&part=0
Linear Mode
