In the instruction included in the wheel bearing is something of wheel bearing must be sent? What can be set at a warehouse? I've already changed many washing machine drum bearings but there was nothing to adjust.

The bearing (SKF) has a large screw. M12 *70. Does anyone know what this is for?
When I expand the bearings, do I have to observe any torques when assembling them?
I would be grateful for your answers.
and true to the motto... Who's slowing down is scared!
Greetings and good drive P. Schröder