http://imgur.com/Wa8GR7H Hey guys, I just would like to ask simple questions about forces/stress of aluminum bolt to be fastened for connecting aluminum extrusion as shown in diagram above. 1. As shown in the drawing, "A" shows the shear, so what force does B have then? 2. So how would you calculate the shear (A)? Do I just do ultimate shear strength x 1/2 x cross-section (pi x radius of screw)? 3. So as I mentioned before, I'm using aluminum bolt to be fastened for connecting aluminum extrusion. How would I go about choosing the suitable aluminum bolt?