I was wondering if a common good quality deadbolt like a Slage is
constructed to survive more of an outdoor environment. I'm thinking of
using one on a gate and the inside plate with the turnknob would get weather
on it as opposed to when they are used normally in an entry door.
If the deadbolt, inside and out, is either stainless or brass, it
shouldn't matter. You might want to grease up the moving parts a bit
for some added protection from water, and caulk the top edges of the
cover plates to help shed water.
I'm sure there's carbon steel inside, it's just plated or phosphate
treated. The water shouldn't be getting to the inside of the lock in
the first place. Most double-key double bolts are interchangeable in
orientation - not sure if you were planning on having a single key and
a thumb latch or a double key - so a little weather won't affect it.
If it's a thumb latch, caulk the "interior" escutcheon to the door/gate
and give the inside a spray of Boeshield T-9 every once in a while.
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