The ultimate guide to choosing the right size door hardware

Selecting the right door hardware may seem simple, but in practice, many factors come into play. The size of the hardware not only determines how well your door functions, but also affects the safety and look of your home. Whether you're starting a new project, renovating a door, or simply replacing the hardware: with the correct size, you avoid frustration and extra costs. In this article, you’ll learn exactly what to pay attention to. Want to browse our range right away? Then check out the [door hardware category on Doika.be].

Why is the correct size door hardware important?

The right size door hardware ensures:

• Optimal operation – The door opens and closes smoothly and safely.
• Aesthetic value – The hardware fits the door and matches your interior or exterior style.
• Security – On exterior doors, the hardware is crucial for burglary protection.

Choosing the wrong hardware can lead to poorly functioning doors, faster wear, or even security risks. That’s why it’s important to measure carefully and choose wisely.

Which measurements matter for door hardware?

There are some standard measurements to consider when choosing door hardware:

1. Door thickness

The thickness determines the screw, cylinder, and hardware lengths needed. Standard sizes:

• Interior doors: 38 - 42 mm
• Exterior doors: 54 mm or thicker

2. Backset

The backset is the distance from the front of the lock to the center of the handle hole. Common sizes:

• 50 mm – standard for interior doors
• 55 or 60 mm – common for exterior doors

3. PZ measurement

The PZ measurement (center-to-center between handle and cylinder) determines fit with your lock:

• 55 mm – often in older exterior doors
• 72 mm – standard for modern doors
• 92 mm – common in European front doors

4. Plate or rose size

This refers to the size of the decorative part of the hardware. Do you prefer long plates or separate roses? In renovations, a long plate can neatly cover old drill holes.

Step-by-step: how to determine the correct door hardware size

1. Measure door thickness – Determines screw and cylinder length.
2. Measure backset – From the front plate to the center of the handle hole.
3. Measure PZ – From the center of the handle hole to the center of the cylinder hole.
4. Check old drill holes – Decide if you want to cover them with a plate.
5. Choose the style – Pick hardware that suits your door and interior.

Need help measuring? Our specialists are happy to assist. [Link to door hardware category]

Common mistakes when choosing door hardware

Here’s what to avoid:

• Incorrect PZ or backset measurements, so hardware doesn’t fit.
• Ignoring door thickness, leading to screws or cylinders that are too short.
• Choosing exterior door hardware without security certification, leaving the door vulnerable.
• Selecting a plate that doesn’t cover old drill holes, leaving an untidy finish.

Real-life examples

At Doika we help customers daily to find the right door hardware size:

• A family in Ghent chose modern black hardware with a 92 mm PZ for their new security door.
• In Bruges, a customer replaced hardware on a 1930s door, selecting a classic plate with 55 mm PZ to keep the original lock.

Why Doika is your reliable partner

With Doika you can count on:

• Quality – Only door hardware from renowned brands, focused on durability and design.
• Expert advice – Our specialists offer personal guidance.
• Fast delivery – Many items available from stock.

Discover more tips in our [blog on choosing secure door hardware].

FAQs

How do I measure the PZ?
Measure the distance from the center of the handle hole to the center of the cylinder hole, in a straight horizontal line.

Can I determine the size myself?
Yes, with calipers or a measuring tape. If unsure, we’re here to help.

What if my door has a non-standard size?
There are custom solutions and universal hardware options. Contact us for advice.

Conclusion

Choosing the right size door hardware is essential for function, safety, and style. Pay attention to door thickness, backset, PZ, and plate or rose finish. This way you’ll avoid problems and enjoy a perfectly working and attractive door. Check out our range in the door hardware category.

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