According to my cheat sheet, if you have a 1" fine thread shank on your ball, and presuming it is equivalent to a grade 5 bolt, the correct torque would be around 700 foot pounds, a bit less if it is plated or oiled. It would take one heck of a cheater bar to over tighten the nut!
Ole and Anne Anderson, Highland, Michigan
'02 Adventurer 32V, Ford F-53, ours since 4/08,Goodyears, Konis, SeeLevel, CHF
'84 CJ-7 , 5.3 Chevy, 3" lift, 33's, Detroit Locker, Fiberglas tub, winch, hi-lift