Thank you all for your help. I was not concerned with the threads or the cylinder failing. What I was concerned with is the hex tip of the hex driver only (the set screw is made of Cobalt Chrome and will not strip, whereas the driver is Stainless Steel). The manufacturer did not change...
I have done mechanical testing on a set screw with a 4mm hex and its driver. I now have a set screw with a 3mm hex. Without the time and expense of making parts and testing, I want to know the percentage decrease in maximum torque that the set screw and/or driver will be able to withstand on the...