Why Installation Quality Matters More Than You Think
A well-made lock installed poorly will fail before a decent lock installed correctly. The most common installation errors — a mortise pocket that's too deep, a misaligned strike plate, or screws that don't grab — all cause premature wear. The lock mechanism is designed to operate under specific tolerances; when the pocket is too loose or the alignment is off, internal components wear unevenly.
Step 1: Use the Manufacturer's Template
Every quality mortise lock comes with a paper or cardboard template. Use it. The template marks the exact position and depth for the mortise pocket, the handle spindle holes, and the keyhole. Freehand marking is the number one cause of misaligned installations. Tape the template to the door edge, mark through the drill points, and check your measurements twice before cutting.
Step 2: Cut the Mortise Pocket
Use a drill to remove the bulk of the material, then clean up the pocket with a sharp chisel. The pocket should be exactly the depth of the lock body — not deeper. A pocket that's too deep means the lock rattles and the faceplate doesn't sit flush. Test-fit the lock body in the pocket before proceeding. It should slide in snugly without force.
Step 3: Align the Strike Plate
The strike plate on the door frame must align precisely with the latch bolt. Even 2 mm of misalignment causes the door to not close properly or puts lateral stress on the bolt. Close the door, mark where the latch meets the frame, and chisel the strike plate recess to match. Test the latch throw with the door closed — it should extend fully into the strike plate pocket without resistance.
All Dorbell mortise locks include precision-cut strike plates and installation templates.
Maintenance: What to Do (and What to Never Do)
Lubricate the lock mechanism every 6 months. Use graphite powder or a PTFE-based dry lubricant — never oil or WD-40, which attract dust and eventually gum up the mechanism. For handle finishes, wipe with a soft, dry cloth. Never use abrasive cleaners, steel wool, or acidic cleaning products (vinegar, lemon juice) on plated or coated finishes. For brass, use a dedicated brass polish if you want to maintain the bright finish.
Installation Specifications Technical
Detailed specifications and standards for technical evaluation.
| Recommended mortise pocket depth | Lock body depth + 1 mm clearance (typically 73–78 mm) |
| Door thickness range | 30–45 mm (standard), 45–55 mm (heavy-duty) |
| Strike plate recess depth | 2.5 mm (flush with frame surface) |
| Screw specification | #8 × 25 mm wood screws (faceplate), #10 × 32 mm (strike plate) |
| Lubrication schedule | Every 6 months (residential), every 3 months (commercial high-traffic) |
| Lubrication type | Graphite powder or PTFE dry lubricant — never oil-based products |
Have a Specific Requirement?
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