I have a hydraulic cylinder that can lift up to 3 metric tons and I want to attach it to an arm. The bracket is in a rigid U shape (right angles only, no round corners), with a round pin going through it. At first I thought it'd be a simple bending stress calculation, but there is a giant hole in the bracket for where the pin will be inserted. So... how should I approach this problem? How do you calculate how much weaker the bracket will be with the pin hole?