The rated one. If you think the heavier one is stronger you would be wrong.
And if you think that it is, purely on the basis of being "rated", you would also be wrong.
However,
that is not what I said. What I said was: "Guess which is
likely to be stronger" {emphasis added - RB}.
There is an essential presumption which may, or may not, be valid that all other things are equal. They rarely are. However, as my original D-shackles were made by ROMAK, and the new rated ones are also made by ROMAK, it is a fair assumption that they might (please note that I have said "might", not "will") be using the same metallurgy as they were set up to use for previous manufacturing. This assumption is also reasonable because in order to make something out of essentially the same material that is both smaller and lighter and is also substantially (please note that I have said "substantially", not "marginally", nor "a bit") stronger, it needs to be radically altered in some way. Galvanised steel is pretty much the same strength regardless, unless one starts looking at exotic and usually very expensive materials. These materials generally contain substantially different metallurgy, most of which will also dispense with the need for galvanising ... Or they require special manufacturing techniques, such as shot peening or chemical hardening, or whatever to achieve the desired characteristics.
However, I do not pretend to be any kind of expert in these things, I just happen to know a
little about chemical and physical processes, and mechanical devices.
IOW, I already knew that my statement has the
possibility of being wrong, but that it was unlikely to be wrong by the required 15% or greater difference in material strength or other necessary characteristics.
Perhaps I am not wishing to go into this sort of tedious qualification of what I say with each and every word I might write on an Internet forum.
In a court case, yes, if it is warranted and central to the matter before a court; otherwise, no.
I try to be helpful when and where I can, wherever that might be.
Sometimes I will be wrong, and welcome correction when I am.
There is not the slightest intention on my part to be or become argumentative about this, or anything else here.
If it becomes apparent to me that this is part and parcel of interactions on this site, then I will not frequent this site.
Sorry to be so blunt, but it's been a long week.