On Thu, 15 Jan 2009 07:30:19 +0100, "Steve Lusardi"
wrote:

Be very careful here because you have not stated the material under bolt
compression. Depending on whether the material is wood, fiberglass, steel or
aluminum and the washer diameter or cap size used to distribute the
compression load, the answer could be quite different. The torque values or
stretch limits stated by others reflect the maximum elongation force
aacceptable by the bolt material without permanent bolt deformation and do
not consider potential crush limitations of the compression sandwich, which
could be much less.
Steve




The figures I cited are from C&C. I have seen others from
manufacturers of fiberglass sailboats with stainless steel bolts and
bolt on keels and they are all very similar to this.