I am not a mechanic so anybody that takes this reply and goes off and tears up a brand new GCV or Diamond Pro-Am its your own fault.
I work in a building with 500 engineers and this is what I got .... What you're really asking is what is the clamp load. The tension in a typical galvanized 9/16 bolt (3/8 diameter) torqued to 15 ftlbs it is ~2000 lbs. But that is distributed over two surfaces with 1 1/2 inch diameter washers/nut plates. All being being directly proportional to the tension that would give you ~ 1000lbs/sq-inch clamp load.
Re-read paragraph 1. I follow this forum for fun, entertainment, and to make my own table better. My pool table, I just tighten them till they feel "right", making sure not to crush the wood around the nut-plate slots. My propeller is 15 ftlbs because Sensenich Propeller Company says so. I forgot one time and used metal prop torque specs (25 ftlbs) and messed up a $1300 wood prop.