I thought I have 5/16" BBB galvanized chain. In fact when I ordered a replacement for my Maxwell windlass
I measured 10 links and the seller confirmed it to be 5/16" BBB.
I decided to add 2 feet of stainless chain. I found a supplier who I spoke with on the fun (referred to me by Suncor who makes the chain). He supplied me with what was supposed to be 5/16" BBB stainless chain.
I used a supposed 5/16" galvanized split link to connect the two" the galvanized and the stainless. What I discovered is that all these items have different cross sections.
None of them are 5/16" diameter. The galvanized chain measured .35", the stainless measure .30" and the split link was just over .25 ( I wonder if they gave me a 1/4" split link.
The length of the links were shorter as well for the stainless. Both chain were stamped 3B on the links.