Michael!! Howdy! I did not expect to run into you, or anyone else I know, here! See, this is what happens when you tell me that you're no longer taking orders. I go off and start trying to figure out how to do things myself! ;-) I hope you and yours are doing well. Been extremely busy here at Casa de OffLead this year, but the pup is finally looking like he's approaching adulthood...he's finally filling out.
Yes, I really do mean bronze. :-)
The very best two leads I have ever owned both have bronze hardware. They are, in fact, Italian bronze. Very nice hardware. Even the small bolt snap on my 15 year old 3-foot braided lead has held up not only to time, but to being yanked around by even the 200 lb dog. (I can't think of the size right off hand, but it's smaller than a 1/2-inch, larger than a 1/4-inch...I can't go check, because as you know going TO the leashes gets all the dogs up and ready to head out. Ty has killed quite a few bolt snaps in his short life so far, all larger than this one.)
While cold temps are not really an issue for me now, I believe bronze is stronger at colder temps than brass. And it ages beautifully.
I have found a couple of sources for bronze bolt snaps, down to 1/2 inch. I do need some a bit smaller than this, but have had no luck at all. And I can't seem to find bronze O-rings anywhere but my hardware store. (Not the big box stores, of course, but a local place.) Unfortunately they don't have the bronze O-rings smaller than 1-inch, which really is larger than we need. But the only places are like gun-dog supply companies, and the bolt snaps are a few dollars a piece. Obviously I'd like to find a more economic source.