need help axle nut torque spec

I just purchased a used 2006 a3, and I am replacing the old 6 pt axle bolts (27mm) with new 12 pt axle bolts (i believe 24mm).

Could someone help me out with the torque specs for the 12pt axle bolts?

I would also like some recommendations for a good owners manual for this car. A lot of people say Bentley's, but I'm curious about my options....

I can tell you it is not 52lbs. snapped one, car stayed on jacks for 4 more days as i waited for the replacement.