Mortise Lock: Review & Recommendations

Welcome to our big Abus lock cylinder test 2020, where we present you all Abus lock cylinders tested by us. We have compiled detailed background information and also added a summary of the customer reviews on the net.

We want to make your purchase decision easier and help you to find the best product for you.

You can also find answers to frequently asked questions in our guide. If available, we also offer you interesting test videos. Furthermore, you will also find some important information on this page which you should pay attention to if you want to buy an Abus locking cylinder.

The most important facts in brief

  • Mortise locks are available in different versions and also in different shapes and colours. Which one exactly you need must be clarified in advance with the dimensions and requirements.
  • Mortise locks are available with and without bolt. The deadbolt is used to lock the door after it has been closed, thus providing even more security and protection against burglary.
  • To avoid problems when installing a mortise lock, you need to determine the exact backset and buy the right lock for a DIN right or DIN left orientation. Afterwards the installation is a piece of cake.

Mortise lock test: editorial favourites

  • The best mortise lock for apartment and front doors
  • The best mortise lock for the bathroom

The best mortise lock for apartment and front doors

This mortise lock is particularly suitable for apartment and front doors. When the door is closed, in which this lock is installed, the latch automatically closes the door. However, it must be locked so that the bolt additionally blocks the door.

The mortise lock is made of metal and weighs about 780 g. The distance measure is 92 mm and has a rounded forend with a width of 20 mm. The German standard of DIN 18251 class 3 corresponds exactly to this distance dimension and backset.

The mortise lock is designed for DIN left-hand doors and is less expensive than the cheaper versions.

The best mortise lock for the bathroom

This mortise lock is available in hammered gold, brass, silver or white. You can also choose between a left or right-hand guide or left and right-hand guide.

The dimensions in which this mortise lock fits are class 1 according to DIN 18251, which means that the distance dimension is 78 mm and the rounded forend is 20 mm wide. The fact that it is so narrow makes it particularly suitable for thin bathroom or toilet doors.

Because this lock does not require a high security standard, it is a cheaper product.

Guide: Questions to consider before buying a mortise lock

How does a mortise lock work?

A mortise lock is probably in every door in Germany. But because doors require different functions, as they are used in different places, such as public buildings or as front doors, different construction techniques are always required.
In order to give you an idea of what kind of mechanism is integrated into the interior of a door, a small video for visualization is now available:

A mortise lock works quite simply. With the help of a lever, the door handle or the key from the outside, the so-called latch, which holds the door in the unlocked state, is moved in or out.

When the latch is pushed down, it is driven in, when it is released it is driven out again and locks the door again.

There are also mortise locks that also have a locking function, as they are designed for external doors that need to be locked, for example.

The lock works in such a way that when the key is turned from the outside, first the bolt is unlocked and then automatically, when the door is unlocked, the latch is turned inwards by turning, as with the latch mechanism, and the door

Why do I need a mortise lock?

Normally, each door requires a mortise lock to be able to hold the door. This is because the latch secures the door to the door frame.
This means that without a mortise lock it is difficult to close a door at all and for doors that separate the inside and outside, this must be possible.

How much does a mortise lock cost?

The price range of mortise locks varies greatly, as the different types provide different levels of security, or are not suitable for one or the other, or can only be used for something. What exactly for and what this means for the advantages and disadvantages follows in the decision section.

Where can I buy a mortise lock?

Mortise locks can of course be bought online, but also in Bauhaus shops where you can also buy doors. Which mortise lock you need and how it can be measured and categorised follows in the decision section.
building material

What alternatives are there to mortise locks?

There are now also other types of castles. First, the fingerprint scanner lock. This opens the door using the registered fingerprint that is authorized to open that door.
This serves as an alternative in that no keyhole or mortise lock is required. The door is only opened via the mechanism of the finger.

As a second alternative, you can choose door locks with a combination of numbers. No key is required, but the correct combination of numbers must be entered so that the door can open.

Decision: What types of mortise locks are there and which one is right for you?

What are the characteristics of a mortise lock with crayon hole punching and what are its advantages and disadvantages?

The inexpensive colored beard lock got its name from its appearance. While normal locks have a round head and narrow down, the crayon hole opens like a semicircle at the bottom, making it look as if the head of the key has a beard.

Colourful stand before beard, because this lock can also be produced in all variants or colours and forms.

A disadvantage of the Buntbart lock is its low security standard, but that is why this mortise lock is used for interior room doors, where a high level of security is normally not guaranteed.

Furthermore, the Bunbart mortise lock cannot be installed in security doors, as it cannot provide smoke or fire protection.


Cheaper purchase
Available in all shapes and colours


Rather for interior doors
Not suitable for security doors

What distinguishes a Chubb mortise lock and what are its advantages and disadvantages?

The Chubb mortise lock is a further development of the Buntbart lock. For the first time the keys of the Chubb lock have several prongs at the lower end and thus lift small locking tumblers with the different lengths of the prongs and thus open or close the door.

The bolt of this mortise lock enables the complete locking of the door by turning it twice, which works in the same way as opening the locking tumblers.

As this type of mortise lock is no longer the most modern, as it normally has a very bulky key, it is no longer used for house or apartment doors. This was the case until the 60s approximately, but it was largely replaced by modern variants.

There are also further developments of the Chubb mortise lock with which today safes or prison cells are locked. But these are only the latest models.


Multiple tumblers
With latch
Latest models for safes or prison


Locked key
No longer used for house and apartment doors in normal use

What distinguishes a mortise lock with PZ perforation and what are its advantages and disadvantages?

A mortise lock with a PZ perforation is the most common variant that is installed in Germany today.

PZ perforation or profile cylinder is also used for entrance doors.

There are two different closing mechanisms for the PZ perforation. One is the keyed alike system or the other is the keyed differently.

There are also emergency and danger functions which ensure that the door can be opened if the key is still inserted on one side. It is also suitable for security doors, as it usually provides fire, drilling and smoke protection.

With a mortise lock, however, special care must be taken to ensure that it is inserted correctly, as incorrect insertion or protrusion of the lock can lead to security problems.

In addition, in the case of a PZ perforation, you have to find out exactly which model you really need, since, as already mentioned, there are different functions and mechanisms that have different security standards.

However, if you would like more detailed information on this subject, please read the article on ABUS locking cylinders.


Suitable for entrance and front doors
Different closing mechanisms
High safety standards possible


Not the lightest to install
Different models have different security

What distinguishes a mortise lock with bathroom bolt and what are its advantages and disadvantages?

A mortise lock with bathroom bolt is a key-free lock. The lock is opened with a knob which opens or closes the lock manually. This makes the lock easy to handle in rooms that are opened or closed several times a day.

However, as this type does not offer a high standard of security, as you can open the door from the outside with a flat object, this mortise lock with bathroom bolt is used exclusively for bathrooms. It can of course also be attached to other interior doors, but the normal case is the bathroom door.


No key
Easy opening and closing


Exclusively for bathrooms
No high security

Purchase criteria: You can compare and evaluate a mortise lock based on these factors

  • Material
  • Safety standard
  • Backset
  • Alignment


Mortise locks can be made of different materials. Often different elements of the mortise lock are made of different materials.

Normally and one of the safest materials is stainless steel. Often whole mortise locks are made of stainless steel, but there are also variants where the bolt and latch are made of metal.

Zinc is also often found in mortise locks. They are often made of a stainless steel core and a zinc shell. All in all, stainless steel mortise locks have the most positive resonance, but metal locks can also be a secure variant.

However, if the mortise lock is made of a different material, which has not been mentioned so far, a second opinion or advice in e

Safety standard

The security of mortise locks is measured by the purpose for which the mortise lock can be used. As already described in the above part, there are different types of mortise locks.

A mortise lock with PZ perforation offers the highest security, while a mortise lock with a bathroom bolt would not be able to avert a drilling incident or the like. The material of the mortise lock must also be taken into consideration, because a pure zinc lock cannot and is not as secure as one made of stainless steel.

Therefore, before buying, it must be carefully considered for exactly which door the mortise lock must be purchased for and what material it is made of.


The backset is a dimension that is only available for mortise locks. This dimension is the distance from the centre of the keyhole and the square that attaches the mortise lock to the outer edge of the mortise lock.

Doors can have different backsets, so if you want to replace the mortise lock, it is important to measure the distance of the old lock in advance.

A typical backset for solid doors is 65 mm. Since backset is always specified in millimetres.


Before you buy a mortise lock for your door, you need to know in advance whether the door is a DIN left-closing door or a DIN right-closing door. In doing so, the view into which the door opens has to be considered.

The door is DIN-right closing when the door hinge is on the right from the viewpoint and opens to the right accordingly. This in turn means that the closing mechanism engages on the left side. For DIN left-handed doors, the other applies in each case.

Depending on what kind of door you have, you will then have to buy a DIN right or DIN left mortise lock.

Trivia: Worth knowing facts about mortise locks

How do I install a mortise lock correctly?

A mortise lock is usually not witchcraft. It can be done in a few simple steps.
The following is a small instruction and the video, where you can have a closer look at everything:

    Unlock the key.
    Unscrew the outer screws and remove the door handle.
    Pull out the square from the other side.
    Unscrew and remove the screws at the mortise lock.
    Pull out the mortise lock.
    Insert a new mortise lock into the door.
    Tighten the screws.
    Put the door handle back in.
    Screw them all back on from the opposite side. Done!

How do I open the mortise lock without a key?

A normal mortise lock can be opened by means of a card, such as a credit card, identity card or similar. However, the door must not have been actively locked, but only closed, so that the latch has only closed the door.

Then insert the card above the lock between the door and the door frame. Then you try to get the card slowly stuck to the latch and slowly come in between and then push the latch in.

With a little patience you can make it to the door