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G70 is not high enough to get away without galvanizing, and it is possible to obtain hot-dipped high tensile. It's often branded as "transport" chain in the US, don't know where you are. The galvanizing reduces the tensile strength a little, which is factored into the WLL figures.
As SD implies, you will also require calibrated chain if it's to be used on a windlass gypsy, it doesn't sound like the finishes you mention are likely to be.
High tensile is a good idea as it allows a considerable amount of weight to be saved from the bow of the boat.
There is more info on grades and sizing for anchor chain here, it's an attempt at a fairly complete guide to selecting chain for anchor rode:
Chain (Rocna Knowledge Base)
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Sailnet Disclosure: Craig is the son of the designer of Rocna and has a financial interest in its success.
Last edited by Craig Smith; 05-11-2009 at 11:14 PM.