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Read the article →Choosing a Mortise Body and Door Thickness for a Smart Lock
Most failed smart lock orders fail on fit, not on electronics. A lock that is correct in every other way is useless if the mortise is 5 mm out or the door is thicker than the body allows.
The four measurements
Swipe the table sideways to see the full specification →
| Door thickness | Most models fit 35-55 mm; mortise models can be configured for 40-120 mm |
|---|---|
| Mortise body | 5050 / 5845 / 6860 / 7255 / 8545 / 8560, or lock-only if you hold body stock |
| Backset | Distance from the door edge to the centre of the spindle or keyhole |
| Handing | Left or right hand, decided by the hinge side of the door |
How to measure in practice
- Photograph the door edge with the existing lock in place, straight on, with a ruler against it.
- Measure the door thickness at the lock, not at the hinge, because doors are not always uniform.
- If a mortise body is fitted, either read the body code or remove it and measure the length and the fixing centres.
- Note which side the hinges are on, so handing can be confirmed.
- For a multi-unit project, send the door schedule rather than one door.
When the door has already been cut
An existing cut-out is the hardest case, because the body has to fit the hole rather than the other way round. Non-standard mortise lengths and stainless versions can be engineered from the measurement, and an installation template is supplied with the production order.
Why we confirm before production
A body that has been produced to the wrong size cannot be reworked and cannot be sold to anyone else. Confirming the measurement costs a day. Discovering the error costs a production run.
Send a door photo and we will confirm the fit
One photo of the door edge or a body measurement is usually enough to confirm the mortise, the backset and the body.
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