I'm attaching a metal pipe to a metal tube as shown in the below diagram. The bolt is threaded through one wall of the pipe and does not pass through the opposite wall of the pipe, but is tightened to the point of bottoming out against it. The bolt passes through unthreaded holes in the tube. It needs to support a load in the direction of the red arrow. I need a bit of a gap between the pipe and tube, so I'll be relying on the ability of the bolt to resist bending under this force. Assuming that nothing else will give out first, what metric would I use to estimate how much weight it can support before flexing the bolts? Is it "bending stiffness" rather than "shear strength"? Bolts don't typically advertise bending stiffness, so how would I estimate that? I know distance between tube and pipe is a factor because it increases the leverage the force has to bend the bolt.
I'd think that filling the void between tube and pipe with nuts/washers would strengthen this arrangement when two flat surfaces are being attached, but since the pipe is round, is there any point? I don't expect a precise answer I just need a way to get a ballpark estimate without bending the bolts before selecting them. Hardware stores don't care for that.
It's for an improvised rail if anyone's wondering. I need upwards of 80% of the circumference of the pipe for the slider to grip it, which is why I'm attaching it in such a dumb way.
Something like this (not my image) will be rolling along it.
I haven't found a way to manufacture a proper cradle for the pipe. (EDIT, a U channel would probably work if I can find one the right size) I know that it would be much stronger if done vertically, but this has some advantages given my situation.