Smart Fingerprint Door Lock 5-in-1 | TTLock – TA-DL06

Does your lock need a mortise? If the product page has a Mortise option to choose from, or the description lists a mortise type, use this guide. Cylinder locks, rim locks and glass-door locks fit without one, so you can skip it for those.

The mortise is the lock body that sits inside the edge of your door. The right size depends on your door.

Reading the code

Each mortise has a four-digit code, for example 6085:

• First two digits = backset: the distance in mm from the edge of the door to the centre of the handle. 6085 = 60mm backset.
• Last two digits = series: the distance in mm between the handle centre and the key cylinder centre. 6085 = 85mm. Only choose codes the product offers.

Single latch options have no deadbolt. They are a simple latch for interior doors, apartments and rooms where a handle and latch is enough.

Series used by our locks

Choosing a size in the 85 series

85 series sizes and measurements

The top measurement on each drawing is the backset. All dimensions are in mm.

European codes: 7255 and 8570

Some locks, such as our TA-KN05 smart knob, offer European mortises. These codes are written the other way round, with the series first:

• 7255: 72mm between the handle and key cylinder centres, 55mm backset. This is the standard size in much of continental Europe.
• 8570: 85mm between the handle and key cylinder centres, 70mm backset.

Measure your existing lock as described below and match both numbers. If your door already has a 72mm or 85mm lock with the same backset, it will usually fit the existing cut-out.

Got a UK lever sashlock?

This is the most common lock on UK internal doors, offices and HMO rooms: a lever handle on a tall backplate, with a keyhole below it, and a lock body inside the door with a latch and a key-operated deadbolt.

Our TA-HL14 and TA-HL06 smart handles replace the handle, latch and key with one unit. You open them by fingerprint, code, app or key, and the HL06 also takes cards. They aren't a straight swap, though:

• They use their own latch. The sashlock body comes out, and the smart handle's latch and fixings go in. The door usually needs new holes drilling. The smart handle's large backplate normally covers the old keyhole.
• There's no deadbolt. The door locks on the latch only. That's fine for a bedroom, office or storeroom, but not for a final exit door. For a front door, use one of our front door locks, and check your insurance, since some policies require a BS 3621 lock.
• Fire doors need extra care. HMO bedroom doors and office corridor doors are often fire doors (FD30). Anything fitted to a fire door must keep its fire rating. Check with your fire risk assessor before changing the lock on one.

Measuring a sashlock: the backset

The backset is the distance from the edge of the door to the centre of the handle spindle. UK sashlocks come in two common sizes, and the case length is often stamped on the metal plate on the door edge:

Also check door thickness: 35–55mm for the HL14 and 35–50mm for the HL06. Most UK internal doors are 35mm or 44mm thick.

If you're not confident drilling a door, a locksmith or joiner can fit it. Not sure what you have? Send us a photo of the door edge and the handle, and we'll tell you which option to choose.

How to measure

1. Open the door and look at your existing lock.
2. Measure from the edge of the door to the centre of the handle spindle. That is your backset.
3. Measure from the handle centre down to the key cylinder centre. That is your series.
4. Choose the code that matches both numbers, from the options offered on the product.

Door thickness also matters. Check the "Door Thickness" range in the product description.

Not sure? Send us a photo of your current lock and door edge using the "Ask About This Product" button, and we will confirm the right size before you order.