2.2 mm zing-it (or lash-it, same thing) has an minimum strength of 450 pounds. Amsteel blue 7/64" has a minimum strength of 1400 pounds. The 7/64" amsteel blue is the smallest thing that most people hang from. Hanging from a 450# rated line, even if it's doubled like a link, would be a fairly bad idea unless you take lots of precautions to never hang tighter than about 20 degrees at most and never wrap the line around anything that will derate it very much. Probably not a great candidate for a link that will be load bearing.
Boris
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