Loose Crank Arm Problem

This thread has made me paranoid! Looking for some advice.

I want to replace my bottom bracket and reinstall the cranks. I have the Park Tools crank remover, BBT-32 tool, large adjustable wrench and the long Park Tools 8mm hex key.

Is it possible to apply 40Nm of torque using the long 8mm hex key to re-secure the cranks properly? I'll be honest I don't have a 'feel' for torque yet, I'm very new to repairing bicycles. My gut feeling says no, as the hex key is only 16cm long, so that would be the equivalent of hanging a 60kg-ish weight off the end of it to get it up to spec.

Almost certain it will be possible, the long Park hex wrench is the de rigeur tool for tightening and loosening crank bolts. I'd be very surprised if anyone made cranks that couldn't be tightened with that.

That said, I have never, while spannering personally or professionally, used a torque wrench on crank bolts.

Unless you are Mr Universe or unbelievably weedy then just make them as tight as you can and they'll be fine.

If you want to worry about torque values then I'd be more worried about what it'll take to shift your bottom bracket out of the frame, that's generally what seizes and requires silly amounts of leverage (tool in vice and use frame as a lever) to move.