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Get the perfect fit: How to measure your door for the Bold Smart Lock?

Before ordering your Bold Smart Lock, it is essential to confirm your door's measurements. Bold cylinders come in standardised sizes (with adjustable components), so measuring correctly helps you select the right fit.

Use the video guide below to support your measuring process—or follow our step-by-step instructions to get it just right.


 

Step-by-step measuring guide

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To get started, you will need a measuring tape or a ruler.

  1. Find the centre screw hole of your current lock—this is your reference point.

  2. Measure from the centre screw hole to the outer edge of your door (on the interior side).

  3. Repeat the process on the exterior side: from the centre screw hole to the outer door edge.

  4. Be sure to include any existing hardware or security features like core pull protection in your measurement. These may impact the total cylinder length required.


Adjustable outer length

Bold cylinders feature an adjustable outer module to accommodate different door thicknesses.

  • Standard outer lengths: 30 mm or 50 mm

  • Extension options: +5 mm, +10 mm, or +15 mm

  • Example: The SX33 version can extend from 30 mm to 35, 40, or 45 mm using the included adapters.

Key considerations

  • Mind the margin: Ensure at least 30 mm of space between the lock’s centre hole and the door frame on the inside. This prevents the thicker inner knob (47 mm wide and 39.5 mm deep) from being blocked or pinched.

  • Sliding doors: The depth of the inside knob may limit movement. If your door slides open internally, double-check that this 39.5 mm depth allows for smooth operation.

Understanding the Bold Smart Lock’s dimensions

  • Outer knob diameter: 32 mm

  • Outer knob depth: 32.6 mm

  • Inner knob diameter: 47 mm

  • Inner knob depth: 39.5 mm

This means: The inner knob is thicker and extends further than the outer knob. Make sure your door has enough clearance, especially on the interior side.

By following these steps, you'll ensure that your Bold Smart Lock fits perfectly, providing both security and ease of use.