Drilling hole in 1-3/8" pipe for fulcrum I am designing a small crane for a special purpose. I am using a 17 ga. steel 1-3/8" ten-foot pipe as a fulcrum. I am going to drill a hole 2 feet from one end to run the axle through. That will leave 8 feet on the other side. Is there a table or formula to determine how much load strength this will have? More importantly, what would the strength be depending on what size hole I drill? Is a 1/2" hole acceptable?