We do not have a recommendation for this application as other factors such as installation and gate sag could impact the desired results.
This Post Latch will work on an 3-1/2" thick gate.
You can use an inexpensive Buckle Carabiner. It can be found almost anywhere for less than a dollar. Here is the link for the ones available at Home Depot: https://www.homedepot.com/s/Buckle%2520Carabiner?searchtype=text&NCNI-5 Good luck, Lomar
Easy from either side. The latch has 2 holes that match up with a hole in the mounting plate. Simply install the latch normally and add a lock on which ever side you prefer. The 2 holes can be seen as the one closest to where the return spring attaches to the plate and hole just above where the latch catches the capture bolt.
There is a replacement latch bar sold under store part number 31860.
We do not carry a replacement spring option.
I wouldn't install on an aluminum gate. I guess it can be welded to a metal gate. Primarily for wood gates, comes with wood screws.
The bolts for this Post Latch are 5/16”x2” Lag Screws.
You're using the wrong hole. Follow the long handle to find the holes for both inside and out.