From my 1960 Ford Truck Shop Manual. All specs should be the same for the 1957 model:

17. Install the outer bearing cone and start the bearing adjust nut. Turn the adjuster nut until the bearing adjustment is approximately correct. Now tighten the adjust nut and at the same time rotate the wheel in both directions. This is done so that all bearing surfaces come into proper contact. With the bearing rollers firmly seated, back off the adjuster nut 3/8 of a turn, and then install the lock washer.

If the adjusting nut is equipped with a locking dowel, make sure that the dowel enters the lock washer hole which most closely aligns with the dowel.

If the lock washer is equipped with tabs, run the lock nut against the lock washer and bend a tab over the adjusting nut.

18. Torque the lock nut to 100-150 foot-pounds (Fig. 21). With the lock nut at proper torque, the wheel must still rotate freely and without perceptible end play. Bend a lock washer tab over the lock nut, if the washer is so equipped.