Kavan flat hinges
These precision injection molded flat hinges are the strongest on the market, bare none.
Try prying these apart with pliers and you will be amazed.
These have been the most popular giant scale flat hinges in Europe for quite a while and are now available in the US. Nothing comes close to these Kavan flat Hinges.
1-17/32” x 25/32 (39mm x 20mm)