Very tough question. Difficult to know off the top of your head, but something that would be good to have an idea about at least if not a way to figure it out even if the engineering part of it all is not your job. Extra credit, how do you figure it out for the normal zinc bolts much less ones of other materials? In bolting a stair case to a platform, what makes you choose one bolt over another and what determines how many you need? What would be the tensile strength much less sheer strength of the above bolts? Note: This is a very hard type of question even for me but something that does come up frequently if only in the most simple form of it. For instance, if you have a 3/8-16x4" Alloy socket head cap screw holding a 95# light, but need to extend it’s length to 6" how do you do so given 6" above bolts are not sold and it has to stay that type of screw head? Do you go with a 18-8 Stainless Steel socket head cap screw in the desired length, coupler on a threaded rod of appropriate grade, and if so what grade of coupler would you use? Do you have to spend $24.00 each for a grade 8 coupler or would say a grade 5 coupler work given it’s going to be stronger than the stainless one for the weight carried. What’s the sheer strength of a 5/16" zinc plated lag bolt, how do you figure it out so you know if it’s sufficient in strength, or if going up a size or adding more would be more appropriate.