No recommended torque specs that I've ever heard of. My method is to tighten until I hear the first signs of fiberglass crunching and then stop. Make sure you use the double nuts provided with the boat to keep them locked, we've tried a single nut which seemed to loosen after every sail. Also, with a new boat make sure to re-tighten after every sail for the first few sails just to make sure everything seeds down properly and then re-check for tightness every few sails after the boat has been broken in.
Hobie Factory Team