I want to replace the hub bearings on the front of my car but am unsure about a few things about the center axle nut:

1. Size of the axle nut?
2. Amount of torque to tighten?
3. Should I reuse the axle nut or buy a new one?

Thanks in advance

 

1. use a tape measure or ruler (it's like 36mm just guessing)
2. 180ftlbs
3. dont matter reuse or replace.