Using the info mark published on hex bolts i decided to calculate the shear stress that would be experienced M12/ smallest bolt (largest stress) and the M36/ biggest bolt (smallest stress). I also calculated the stress on the leg pins by using the dimensions in mark's cad drawings. I found that the largest stress obtained was 92mpa when using the M12 bolts, which is not a problem as carbon steel generally has a shear stregnth of 42000psi = 289.5mpa.
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