how much torque for hub nut?

[Smoker]

I got my 20" 405 + 48v20a in today from ebikes.ca.

Last time I had to replace a tire on my 26" setup I striped out the threads on the axel from over torquing.

This time i'm using my torque wrench. What's a good rule of thumb for ft. lbs on these hubs?

Thanks