The complete guide to C/C measurements on door hardware
When choosing keyhole escutcheons for your doors, you will quickly come across the term c/c measurement.
For many homeowners, this is a technical detail they rarely think about – until they are about to place an order and must choose between 27 mm and 35 mm.
This is where confusion often begins.
Is 27 mm the standard?
Is 35 mm more common?
And what about 30 mm or 38 mm – are they the same?
In this guide, we explain what c/c means, how to measure correctly, and how to ensure that your escutcheon plates from Buster & Punch fit perfectly.
What does C/C measurement mean?
C/C stands for centre to centre.
It refers to the distance between the centre points of the two screw holes used to mount the escutcheon plate to the door.
It is important to understand:
👉 The c/c measurement does not refer to the size of the keyhole
👉 It refers to the distance between the fixing screws
If this measurement does not match your door, the escutcheon cannot be installed correctly without drilling new holes.
Handle screw spacing vs. keyhole escutcheon screw spacing
This is where most confusion arises.
Door handle screw spacing
When you see references to 30 mm or 38 mm, this usually relates to the screw spacing or internal fixing dimensions associated with door handles.
Keyhole escutcheon screw spacing
For keyhole escutcheons from Buster & Punch, the available c/c measurements are:
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27 mm
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35 mm
(for both EURO and TRADITIONAL profiles)
This means 27 mm and 35 mm apply specifically to the mounting screw spacing of the escutcheon plate – not the handle.
Is 27 mm or 35 mm used in Denmark?
While 27 mm is often described as a “Scandinavian standard”, the reality is more nuanced.
In Denmark, both 27 mm and 35 mm are used, depending on:
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The age of the door
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The type of lock case
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Whether the door was produced for the Scandinavian or broader European market
From experience, 35 mm is frequently encountered in Danish homes – but it cannot be assumed.
The most important rule is therefore:
Always measure your existing escutcheon before placing your order.
How to measure correctly
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Remove your existing escutcheon plate
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Locate the centre of the top screw hole
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Measure to the centre of the bottom screw hole
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Read the measurement in millimetres
It will typically measure either 27 mm or 35 mm.
EURO vs TRADITIONAL – What is the difference?
Buster & Punch offers two escutcheon profiles:
EURO
Designed for euro cylinder locks (oval cylinder profile)
TRADITIONAL
Designed for classic keyhole locks
Both versions feature:
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51 mm diameter rose
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4 mm projection
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Bolt-through fixing
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Suitable for door thicknesses 35–54 mm
Both are available in 27 mm and 35 mm c/c measurements.
Can you change from 27 mm to 35 mm?
Technically, yes.
Practically, it is rarely advisable.
It would require:
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Drilling new holes
-
Risking visible marks on the door
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Potential misalignment
With premium hardware such as Buster & Punch, the correct c/c measurement should always be chosen from the start.
Frequently Asked Questions
Is 27 mm the same as 30 mm?
No. 27 mm and 30 mm refer to different screw spacings and are not interchangeable.
Is 35 mm the same as 38 mm?
No. 35 mm applies to escutcheon screw spacing, while 38 mm typically relates to handle or lock case configurations.
Do Buster & Punch escutcheons fit Danish doors?
Yes – provided you select the correct 27 mm or 35 mm c/c measurement.
What happens if I measure incorrectly?
If in doubt, contact us before ordering. We are happy to double-check measurements to ensure the correct fit.
The most important takeaway
Regardless of what you may have read about “standard” measurements:
Always measure your existing escutcheon before ordering.
It takes two minutes – and ensures your Buster & Punch keyhole escutcheons fit perfectly.
Need assistance?
If you are unsure about screw spacing, profile selection or installation, feel free to contact us.
We specialise exclusively in Buster & Punch door hardware and are happy to guide you towards the correct solution the first time.
Ready to choose the right escutcheon?
Now that you have measured your c/c distance, explore our full collection of Buster & Punch keyhole escutcheons in 27 mm and 35 mm.
Each escutcheon is crafted from solid metal and designed to match our door handles and hardware finishes.
