Schlage does not provide thick door templates for mechanical locks such as the ND series cylindrical or L9000 series mortise locks.
Schlage does not dictate where the centerline of the latch should be on a thick door. On a standard door (1-¾), the latch would be centered (7/8" to either side). Based on this, doors can be extended inside (EI) extended outside (EO), extended equally (EE) or extended differently (ED).
When ordering locks, care should be taken to specify the total door thickness and how the door is extended to ensure the lock is built correctly for installation on the thick door.
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