The minimum door thickness that the AD or CO series lock will mount on is 1 3/8". Be advised that this will require additional spacers to be ordered separately to allow the lock to mount onto the 1 3/8" thick door.
The maximum door thickness that the AD or CO series lock will mount on is 2 3/4". Be advised that this will require an additional door thickness kit (if not specified when ordering the lock) to allow the lock to be mounted onto a 2 3/4" thick door.
Other door thickness kits are available for the AD and CO locks in 1/8" increments from 1 3/8" to 2 3/4". The AD or CO locks do not offer door thickness kits for doors thinner than 1 3/8" or thicker than 2 3/4".
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