Use a 2-1/16" spindle nut socket to tighten the inner nut to 30 ft-lb, while rotating the hub/rotor. This is to seat the bearings.
Back the inner nut off 1/4 to 1/3 of a turn.
Install the flat-washer and the second (locking) nut, and torque this second nut to 125-150 ft-lb.
The outer nut with the set-screws (as used with the Auto-Matic and Lock-o-Matic hublocks) does not require as much final torque -- as it relies on the set screws engaging in a slotted tab-washer to prevent their loosening.