clare wrote:

snip

As long as the bolts are properly torqued and everything fits snuggly
it will be no problem as they will be almost totally in tension. If
loose or ill-fitting parts, the bolt can be in shear, and they are
more likely to fail than a grade 5 or 8.8

Indeed, the shear force is intended to be carried by friction, not the
bolt itself. But I'm not sure that high tensile bolts would be more
likely to fail in shear. Perhaps someone else knows for sure?

Best wishes,

Chris