well, taken them to CAS coatings in Bradford today, gonna be ready on wed for collection, then gotta rebuild them

gonna take a day, bolts have being soaked in nitromours then coke then fairly liquid, and just need a scotchbrite beofre putting them in.
couple of questions
what size thread are the threads for the bolts?, im guessing they arent gonna run a tap in them for me, and i know it'd be best to clean the threads beofre refitting, i thought it was m7?
should i run some sealent round beofre fitting the centre back in? whats best?
and also should i use a torque ratchet on the wheel bolts? if so what pressure? (gonna have to get one thou

)