Mounting a Universal Cylinder for a Smart Lock with removable batteries

This article concerns:
  • Nuki Universal Cylinder
  • Smart Lock with removable batteries

Do you want to mount a Universal Cylinder for a Smart Lock with removable batteries? Simply follow the steps below.

Note:

Do you rather want to mount a Universal Cylinder with a Smart Lock Ultra? Please follow this link.

Tip: Use the Nuki App

You will need the Nuki App to mount the Smart Lock with the Universal Cylinder. Simply open the Nuki App, tap on the menu (three bars at the top left corner), and select "Manage devices". If you are new to Nuki, open the App and select "Set up device". Then go to "Accessories > Universal Cylinder". The Nuki App will guide you through mounting. The following instructions will give you some additional information concerning the mounting.

General information about the Universal Cylinder

The Nuki Universal Cylinder is designed as a modular solution, covering common cylinder dimensions and allowing for individual adaptation to various doors. It is delivered pre-assembled. The inner and outer lengths correspond to the most common sizes. Therefore, you may not need to change the inner and outer dimensions.

Note:

You will need a screwdriver to change the cylinder.

Mounting instructions: Smart Lock with removable batteries + Universal Cylinder

1. Measure the overhang of the cylinder on the inside

Measure the overhang of the existing cylinder on the inside of the door using the measurement card. Now, select the measured value in millimeters in the Nuki App.

If there is no overhang on the inside, select 0.

2. Measure the overhang of the cylinder on the outside

Measure the overhang of the existing cylinder on the outside of the door using the measurement card. Select the measured value in millimeters in the Nuki App.

Is your door equipped with a protective fitting or a protective rosette? Select the value 0 in the Nuki App.

3. Remove the existing cylinder

  1. Open your door: Now, you have a clear view of the latch and the deadbolt that locks the door. There is a retaining screw under the deadbolt that holds the cylinder in place. Loosen the screw, but don’t fully remove it yet.
  2. Now, insert the key into the existing cylinder on the inside. Turn the key slightly clockwise to about 1 o’clock.
  3. Completely remove the retaining screw.
    Now, you can pull out the cylinder with the inserted key.
Tip!

You cannot pull out the cylinder? Please try turning the key counterclockwise.

4. Determine the inner dimensions of the cylinder

Use the removed cylinder as a model to assemble your Universal Cylinder to the correct length.

  1. Measure the inner length of the removed cylinder using the measurement card. Measure the length from the center bore to the outermost point.
    To do this, place the measurement card over the cylinder so that the hole in the measurement card is aligned with the center bore of the cylinder.
  2. Select the measured length of the cylinder's inner side in the Nuki App. This value will determine whether the inner length of your new cylinder needs to be changed.

5. Determine the outer dimensions of the cylinder

Use the removed cylinder as a model to assemble your Universal Cylinder to the correct length.

  1. Measure the outer length of the removed cylinder using the measurement card. Measure the length from the center bore to the outermost point.
    To do this, place the Measurement Card over the cylinder so that the hole in the Measurement Card is aligned with the center bore of the cylinder.
  2. Select the measured length of the cylinder's outer side in the Nuki App. This value will determine whether you need to change the outer length of your new cylinder.

6. Adjust the outer length of your Nuki Universal Cylinder

The Nuki App will indicate whether you need to remove or add modular extensions.

  1. To change the outer length, loosen the two screws on the bottom of the cylinder using the provided Allen key.
  2. Pull out the rod and replace it with the one that has the appropriate length.
  3. Now, assemble the modules for the outer length like indicated in the app.
    Tip: Ensure that the modules can be smoothly assembled by aligning the recesses of the modules. Rotate them until they click into place.
  4. Finally, insert the module with the keyway and tighten the two screws on the bottom of the cylinder again.

7. Adjust the inner length of your Nuki Universal Cylinder

The Nuki App will indicate whether you need to remove or add modular extensions.

  1. If the inner length of the Universal Cylinder needs to be changed, remove the screw in the front area of the Universal Cylinder. This screw fixes the individual modules together on the inside.
  2. After removing the screw, you can add or remove the modules marked in the app to achieve the desired length.
  3. Use the screw as displayed in the app to attach the modular extensions (inside).

8. Mount the Universal Cylinder to your door

  1. Now, remove the fixing screw. The fixing screw is located on the side of the cylinder, as indicated in the App.
  2. Insert the fully assembled cylinder into the door.
  3. Reinsert the retaining screw into the door.
    Tip! Place the key on the outside of the door and turn it. If that doesn't work, the cylinder may need to be moved slightly forward or backward. Only when you can turn the key, the cylinder is in the correct position.
Note:

For safety reasons, the overhang of the cylinder on the door's outer side should not exceed 3mm.

9. Mount your Smart Lock with removable batteries

  1. Take mounting plate A and fix it to the cylinder with the supplied wrench.
  2. Place the hex adapter (silver) on the mounting plate.
  3. Attach your Smart Lock to the mounting plate.

You have successfully installed your Smart Lock with the Nuki Universal Cylinder!

Note:

Your universal cylinder corresponds to the highest possible security class SKG***. Be aware of the certification restrictions:

  • Do you have a glass window through which your Smart Lock can be seen? Then the certification only applies if the glass is P4A laminated.
  • Do you have a glass window through which your Smart Lock can be seen and is your door made of wood? Besides the P4A laminated glass you should also use a SKG (V) certified anti-drill / manipulation device.
  • Do you have a frosted glass window? No problem, the certification is valid.

Universal Cylinder 1st Generation mounting instructions

The following instructions are valid for the Nuki Universal Cylinder 1st Generation (sold until November 2024).

  1. Open your door: You now have a clear view of the latch and the deadbolt that locks the door. There is a retaining screw under the deadbolt that holds the cylinder in the mortise lock in place. Loosen the screw, but don’t fully remove it yet.
  2. Now insert the key into the existing lock. Turn the key slightly clockwise to about 1 o’clock. Completely remove the retaining screw. Now you can pull out the cylinder with the inserted key.

    Tip: Use the removed cylinder as a model to assemble your Nuki Universal Cylinder to the right length.
    If the cylinder has at least 3 mm overhang on the inside of the door, you can use mounting version A. Learn more about mounting your Nuki Smart Lock.

  3. Developed as a modular solution, the locking cylinder is easy and straightforward to lengthen or shorten to the right size.
    The step-by-step instructions show how to assemble your Nuki Universal Cylinder to achieve the desired length.
  4. The next step is to insert the new cylinder into the door.
  5. Now reinsert the retaining screw under the deadbolt and screw it tight.

And just like that – everything is ready for you to install your new Nuki Smart Lock.

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