No need to convert Yard/hundredweights or whatever, I never use torque wrenches, only confusing. My theory is : A lot more bolts were snapped by torque wrenches than by feel on common spanners.
Yes, Loctite on that nut may lead to offensive language at a later stage unless you chose a low strength for peventing unscrewing once preload on nut has disappeared. I´d go for Locite 221 or 222, no "normal" thread lock, too much force on big threads like here. Maybe think about a tab washer that can be removed without force, even on a crank that you´d have to lock somehow unless using a rattle gun.
Vic