front hub nut torque and size - 200

Hi, think I've warped my front discs so gonna swap them at the weekend but wanted to make sure I have the right socket for the hub nut, does anyone know the size (before I take the wheel off to check). Also when I put it back what shoud I torque it up to? Cheers.
 
hub nut ?

disc is held on with 2 torx bolts - nothing special

caliper with 2 hex bolts think the torque for them is 175nm
 
Ah ok magic (thanks for the caliper setting too), I've not looked at it yet so wondered if it was all held together through the bearing carrier etc and had a big nut on it. The discs have arrived and I see the mounting holes now, cheers.

And yeah, shakey steering wheel under braking. I was hoping it was just pad deposit on the discs but it's persistant and I've tried some 'hot' runs and heavy braking to try and remove it without success. My fault, brain went out the window during a couple of session at Oulton Park and I didn't do anything like a long enough cooling down period before pitting although they have done a few other track days so it could be too much abuse for them (with my over keen braking probably).
 
It's only the rear discs that are held on with the hub nut

I best go tighten my calipers up to 175, think I only put 120 on them!