One detail decides whether a smart lock fits your door: the mortise. Get it right and installation is effortless; get it wrong and nothing lines up. This guide from Covlor® explains the smart lock mortise — what it is, common sizes, and how to choose the right one.
What Is a Mortise?
The mortise is the metal lock body that sits inside the edge of your door, housing the bolts and latch. A mortise lock is stronger than a surface-mounted lock, which is why most quality smart locks use one.
The Common 6068 Mortise
In India, the 6068 mortise is the most common standard — the numbers refer to its key dimensions in millimetres. Most Covlor® smart locks are designed to fit a 6068 cutout, making replacement straightforward on standard doors.
How to Measure Your Mortise
Open your door and look at the lock body on the edge. Note the backset (distance from door edge to the centre of the lock), the overall height and width of the faceplate, and the door thickness. These tell you whether a lock will drop straight in.
Mortise Sizing Reference
| Measurement | Why It Matters |
|---|---|
| Mortise size (e.g. 6068) | Must match the lock body |
| Backset | Aligns handle and cylinder |
| Door thickness | Ensures panels fit front and back |
| Handing (left/right) | Correct bolt direction |
Matching the Lock to Your Door
If your door already has a 6068 mortise, most Covlor® locks fit directly. If it has a different size, the cutout may need adjusting — a job best left to a professional. See our installation guide for the full process.
Not Sure? We Can Help
Send your door measurements to Covlor® support and we will confirm the right model. Remember, orders of two or more locks in Bihar include free professional installation. Start with the buying guide.
Frequently Asked Questions
What is a 6068 mortise?
It is the most common door lock body standard in India, named after its key dimensions in millimetres. Most Covlor® smart locks fit a 6068 cutout.
How do I know my mortise size?
Measure the lock body on your door edge — its height, width, backset, and your door thickness — or send photos and measurements to support.
Can I fit a smart lock to any mortise?
If your door has a matching (usually 6068) mortise, most locks fit directly. Other sizes may need the cutout adjusted by a professional.
Is a mortise lock more secure?
Yes. A mortise sits inside the door and is stronger than a surface-mounted lock, offering better resistance to force.
Fits your door, secures your home
Covlor® Smart AI Door Locks fit standard mortise doors — with a 2-year warranty and free installation on 2+ locks in Bihar.
