GordnadoCRD wrote:
I held back on this at the time but my thought when you posted the pics of the broken bolts is that they don't look at all like a shear failure.
A sheared bolt will look more "smeared" in the direction of the shear, and the edge will be a little curved from the initial point. Also a shorn bolt will have a shear line virtually even with the block it's threaded into, assuming it was tightened enough to have no play. (you would have heard it long before now) (one of your pictures shows as example of this happening, with a bit less than half of the bolt. IMO as it was the only one, it was probably the last one to fail.
Those appear to my experience, to have been fatigued by over-torquing, and separated at the point of the final thread of the mount block. (note the swirl line of failure rather than shear)
As those failed by overstretching, thread-locking compound whether they had it or not wouldn't have made a difference.
I agree, over torqued!
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