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What is a multipoint locking system exactly?

Multipoint door locks run the full length of a UPVC door and feature multiple locking points. These locking points provide increased security for your home whilst offering improved seal compression, and are available to suit all types and styles of doors.

When trying to identify your UPVC door lock, the first step should be to check to see if the lock has any markings on it. The lock should show a manufacturer’s name or maybe a serial number. Some UPVC door locks (such as Winkhaus, Safeware, ERA, GU, Fuhr, Maco, Roto for example) should have a logo on either the faceplate that runs along the edge of the door, or on the lock case itself. To make it easier to identify a door lock, it helps to remove the lock from the door first.

Measuring a UPVC multipoint door lock mechanism

Two vital measurements to check are the PZ (sometimes called the “centre size”) and Backset sizes, as shown in this lock case diagram;

Diagram that illustrates how to measure the “PZ” and “Backset” of a multipoint lock

You will also need to check the various dimensions between the locking points, try to match these up with the technical drawings on the product pages. There are many different types of locking point out there so be careful when you check!

In addition to the latch in the centre, your lock may also have a combination of hooks, deadbolts, roller or mushroom cams etc. The more common types are shown in the following illustration;

Illustration showing different locking points on a multipoint door lock

You also need to know how your lock is operated — the majority of multipoint locks are “lever operated”, whereby you lift the lever upwards to engage the locking points, then turn the key to deadlock it. Many front-door locks operate in this fashion but do not allow the lever to open the door from outside, stopping anyone from gaining entry without a key. To provide this function, these locks either have a single “split” spindle drive, (this is called a “Split Follower”), or have two spindle holes instead. Both methods achieve the same function.

Other locks are operated purely by turning the key a few turns to lock and unlock the door, these are known as “key-operated locks”.

If you’re still having trouble determining which replacement multipoint lock you need, please get in touch. We’re happy to help you with any technical questions.

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