Electure;
I wondered how you were going to test the stuff - never thought you'd suspend yourself on it!!!
FYI a 1/4" bolt in single shear should safely take around 600lbf, so it's failure load is around the same magnitude as the strap. Be careful when assessing breaking loads on components like this; shock loadings, (like a falling object, or a seismic event or putting your weight on the EMT too hastily!), can generate stresses many times the apparent static stress. For instance a weight suspended a hairs breadth from a surface and allowed to drop by gravity doubles the stress momentarily, and it gets worse as the distance fallen increases.
YOU CAME CLOSE! [Linked Image]

Sorry, stress my pet subject!
Alan

Wood work but can't!