A Calibrated Pull Test Tool

I will be tapping 1/4-20 holes into what I think is bronze. It is essential that I do not strip out the threads as I pull on the eye bolt secured into this hole. My goal is to perform a pull test with a known force and then inspect the threads for damage.

I don't have a scale able to measure 250 pounds, so I decided to make a set of sacrificial bolts that will break at a known force. Here is the story.

Click here.

Your comments and questions are welcome. All of us are smarter than any one of us.

Rick