How to Measure Your Euro Cylinder Lock Size

When you want the right euro cylinder lock, measure from the center screw hole to each end. It is important to be exact. If you measure wrong, your lock might stick out or not fit. This can make your door less safe. The good news is you only need a tape measure and a screwdriver. You can do this job by yourself. Some euro cylinder locks have a thumb turn inside instead of a key. These locks often have a longer inside part for the knob. Look at the chart below to see how lock body length changes for different door thicknesses:

Here is how thumb turn and standard models are different:

Tip: D&D HARDWARE has more than 17 years of experience making door hardware. They say you should always check your measurements twice for a perfect fit.

Key Takeaways

• Measure your euro cylinder lock from the center screw hole to each end. This helps you get the right size and keeps your door safe.

• Learn the difference between thumb turn and standard locks. Always check which side faces inside and which side faces outside your house.

• Use easy tools like a tape measure and screwdriver to take out the lock. This helps you measure it right. Check your numbers twice before you buy a new lock.

• Pick a lock size that matches your door's thickness. Make sure it does not stick out more than 3 mm. This stops break-ins and keeps your door looking nice.

• Buy locks from trusted sellers. Look for locks with safety features like anti-snap and certifications. These help keep your home safe.

Identify Your Euro Cylinder Lock

Recognize Lock Types

You might see many locks on doors, but euro cylinder locks stand out for their slim, tubular shape and easy-to-replace design. These locks fit into a special cut-out in the door called a euro profile. You can spot them by their rectangular or oblong keyway and the way they sit flush with the door surface.

Here are some features that make euro cylinder locks different from other cylinder door locks:

• They work well with uPVC, composite, and wooden doors.

• You can upgrade or replace them without changing the whole lock.

• Many types of euro cylinder locks come with anti snap euro locks features, making them tough against break-ins.

• They often have anti-drill and anti-pick technology for extra safety.

• You find them in both homes and businesses because they fit many door types.

D&D HARDWARE, a trusted Chinese manufacturer with 17 years of experience, recommends checking for advanced models like anti snap euro locks if you want the best protection.

You will also see euro profile cylinders in many modern doors. These cylinders use a key or a thumb turn and can be single, double, or thumb turn types. Each type offers different ways to lock and unlock your door.

Lock Type	Key Feature	Common Use
Single Cylinder	Key on one side only	Garage or side door
Double Cylinder	Key on both sides	Front or back door
Thumb Turn	Key outside, thumb turn inside	Main entry doors

   

Internal and External Sides

When you measure a euro cylinder lock, you need to know which side faces inside and which faces outside. The internal side usually sits inside your home, while the external side faces the street or hallway.

Why does this matter? Each side can have a different length. Euro profile cylinders come in many size combinations, like 35/35 or 40/50. You must measure each side from the center cam to the end. If you mix up the sides, your lock might stick out too far or not fit at all. This can make your door less secure and easier to break.

Tip: Always check the internal and external sides before you buy a new lock. Accurate measurements help your cylinder fit the door thickness and lock case perfectly.

If you choose the wrong size, the cylinder could stick out more than 5mm. This makes it easier for someone to snap the lock. For the best security, pick euro profile cylinders that match your door exactly.

How to Measure a Euro Cylinder Lock

Tools Needed

Before you start, gather the right tools. You do not need anything fancy. Most people already have what they need at home. If you want extra accuracy, you can buy special tools made for this job. Here is a quick look at your options:

Tip: D&D HARDWARE, a trusted Chinese manufacturer with 18 years of experience, recommends using a tape measure for most jobs. For extra precision, try a euro cylinder measuring gauge.

Remove the Cylinder

You will get the best measurement if you take the euro cylinder lock out of the door. Here is how you do it step by step:

1. Open the door so you can stand beside it.

2. Find the central fixing screw on the edge of the door, right next to the lock.

3. Use your screwdriver to remove this screw.

4. Insert the key into the lock. Turn it about an eighth of a turn (to the 2 o'clock position). This lines up the cam inside.

5. Gently pull the key and the lock towards you. If it feels stuck, loosen the door handle screws a little.

6. Wiggle the cylinder out. Take your time so you do not damage anything.

If you cannot remove the lock, you can still measure it while it is in the door. Just know that this method is less accurate.

Measure from Center to Ends

Now you have the euro cylinder lock in your hand. You are ready to measure. Here is how to measure a euro cylinder lock the right way:

1. Find the center screw hole. This is where the fixing screw went through the lock.

2. Place your tape measure or ruler at the center of this hole.

3. Measure from the center screw hole to one end of the lock. Write down this number in millimeters.

4. Now, measure from the center screw hole to the other end. Write down this number too.

5. You will have two numbers, like 35mm and 40mm. The first number is the internal size, and the second is the external size.

Note: Always round up your measurement to the next 5mm. For example, if you get 33mm, round up to 35mm. This helps your new lock fit better.

Do not include the thumb turn in your measurement. Only measure the lock body itself. If you measure the thumb turn, your new lock will be too long.

Note Internal and External Sizes

You need to know which side is inside and which side is outside. The internal size is the part of the lock that faces inside your home. The external size faces the street or hallway.

• Write down both measurements. For example, you might have 35mm (internal) and 40mm (external).

• Always list the internal size first, then the external size. So, you would say 35/40.

"Euro cylinder lock measurements should take into account the thickness of the individual door, since the lock should not protrude from either end of the door, nor be swallowed by the door if it is too short. Protruding locks are more vulnerable to attack from illegal activities such as lock snapping."

Standard door thickness for most homes is about 1 3/4 inches for outside doors. Some older homes may have different sizes. Always match your euro cylinder lock to your door thickness. If your lock sticks out more than 5mm, it is easier for someone to break in. If it is too short, it will not work right.

Tip: Double-check your measurements before you buy a new lock. This helps you avoid mistakes and keeps your home safe.

Euro Cylinder Lock Sizing

Common Sizes

When you shop for euro cylinder locks, you will see lots of size options. Most locks use two numbers, like 30/30 or 35/40. These numbers show the length from the center screw hole to each end in millimeters. You might see these common sizes:

• 30/30 mm (total 60 mm)

• 35/35 mm (total 70 mm)

• 40/40 mm (total 80 mm)

• 35/40 mm (total 75 mm)

• 40/45 mm (total 85 mm)

• 45/50 mm (total 95 mm)

You can find even longer or shorter cylinders for special doors. D&D HARDWARE, with 17 years of experience making door lock cylinders, offers a wide range of these sizes. Always match the size to your door for the best fit.

Reference Chart

You do not have to guess which size you need. Professionals use a standard reference chart to pick the right euro cylinder lock. This chart lists all the sizes in both millimeters and inches. It helps you check the measurements before you buy.

Tip: Use this chart to double-check your measurements. It makes choosing the right lock much easier.

Projection Guidelines

You want your euro cylinder lock to sit flush with the door. The maximum projection should not go over 3 mm on either side. If the lock sticks out more, it becomes easier for someone to attack or snap it. Keeping the lock nearly flush helps protect your home and keeps your door looking neat.

D&D HARDWARE recommends checking your lock after installation. If you see it sticking out, try a shorter size. This small step can make a big difference in your door's security.

Note: Many security experts also suggest looking for locks with certifications like CE, BS3621, or TS007. These marks mean the lock passed tough tests for picking, drilling, and snapping.

Tips and Mistakes to Avoid

Double-Check Measurements

You want your new euro cylinder lock to fit perfectly. Double-checking your measurements helps you avoid headaches later. Here's a simple checklist you can follow before you buy:

1. Measure from the center of the cylinder to each edge of the door. This gives you the internal and external lengths.

2. Remember, euro profile cylinders follow DIN Standard 18251. Sometimes, the actual length can be a bit longer. For example, a 30mm cylinder might measure 31-33mm.

3. Remove the old cylinder and use the key to align the cam. This makes it easier to pull out and measure accurately.

4. If you feel unsure about your numbers, reach out to your supplier. They can help you confirm the right size before you order.

Tip: D&D HARDWARE, a trusted Chinese manufacturer with 17 years of experience, always recommends double-checking your measurements. This step keeps your home secure and your installation smooth.

A euro cylinder lock that is too long or too short can cause real problems. If the lock sticks out from the door or does not fit right, it loses efficiency and security. Intruders can spot a lock that sticks out and may try to break it. You want your lock to sit flush for the best protection, especially when you choose anti snap euro locks.

Avoiding Common Errors

Many people make the same mistakes when measuring for a new lock. You can avoid these errors by following a few smart steps:

1. Make sure you have a euro profile cylinder. Other types, like UK Oval or Swiss Round, will not fit.

2. Measure the total thickness of your door. Include any trim or cover plates. Most doors fall between 50-100 mm or 30-70 mm.

3. Check the backset. This is the distance from the center of the keyhole to the edge of the door. You want at least 25 mm, but 40 mm works best for smooth turning.

4. Always measure the existing cylinder before you buy a new one. This helps you avoid picking the wrong size or an incompatible lock.

5. Match your cylinder size to common dimensions, such as 30/30, 30/40, 35/35, or 40/40 mm. This ensures a proper fit and easy function.

Note: When you choose anti snap euro locks, you add another layer of safety to your home. D&D HARDWARE offers a wide range of these locks, so you can find the right size and style for your needs.

Choosing and Buying

Match Measurements

Getting the right euro cylinder lock size is key for a safe and smooth fit. You want your new lock to match your door perfectly. Here's a simple step-by-step guide to help you:

1. Open your door and find the fixing screw in the middle of the lock.

2. Remove the screw and take out the old cylinder.

3. Measure from the center of the screw hole to each end of the cylinder. Write down both numbers. These are your internal and external lengths.

4. Add the two numbers to get the total cylinder length.

5. Make sure the cylinder does not stick out more than 3 mm from the door surface. This keeps your home secure and meets most insurance rules.

6. Use a ruler, set square, or a measuring gauge for the best accuracy.

7. If you want extra protection, look for escutcheon plates or door fittings that cover any small protrusions.

Tip: D&D HARDWARE, a trusted Chinese manufacturer with 17 years of experience, always suggests double-checking your measurements before you buy. This helps you avoid mistakes and keeps your door safe.

You should also check the cylinder's diameter. Most standard euro cylinders measure 10 mm across. For high-security needs, pick locks made from brass or hardened steel. Look for features like anti-pick pins and drill-resistant plates.

Where to Buy

You have many choices when it comes to buying euro cylinder locks. Some shops focus on smart locks, while others offer classic models. Here are some trusted places to start your search:

• Inpulsezero: They offer the Aperio® C100 Knob Cylinder. It works with euro profile locks and fits many European door types. You can install it in about two minutes, and it supports both online and offline access control.

• WELOCK: This online store specializes in smart locks for euro profile cylinders. You can find fingerprint, keypad, and app-controlled locks. They ship across Europe, including the UK, and offer easy installation guides and free returns.

• D&D HARDWARE: As a manufacturer with 17 years of experience, they supply a wide range of door lock cylinders. You can trust their products for quality and security.

When you shop, look for locks that meet EN1303 or BSI standards. These marks show the lock passed tough security tests. Always check customer reviews and choose brands known for quality and support.

Note: Picking the right lock and the right seller gives you peace of mind and keeps your home safe.

Conclusion

Before you buy your next euro cylinder lock, double-check your measurements. Use the reference chart and tips in this guide for extra confidence. Trusted suppliers like D&D HARDWARE, a Chinese manufacturer with 17 years of experience in door lock cylinders, offer reliable options. When you get the perfect fit, you boost your security in several ways:

• It stops burglars from snapping the lock.

• It keeps dirt and moisture out, so your lock works longer.

• It makes your door tougher against attacks.

• It helps you meet British Standards for safety.

You can feel good knowing your home is safer and your lock fits just right.

FAQ

How do I know if a smart lock fits my euro cylinder door?

You can check the product details for cylinder compatibility. Most smart lock models fit standard euro profile cylinders. If you feel unsure, measure your cylinder and compare it to the smart lock specs. D&D HARDWARE offers guidance for perfect fit.

Can I install a smart lock myself, or do I need a locksmith?

You can install a smart lock yourself if you follow the instructions. Most smart lock kits come with clear steps. You only need basic tools. If you get stuck, D&D HARDWARE provides support. Some people still prefer a locksmith for peace of mind.

Will a smart lock work if my door is thicker than average?

Many smart lock brands offer adjustable kits for thicker doors. You should check the maximum supported thickness before you buy. D&D HARDWARE makes smart lock solutions for many door sizes. If you have a unique door, ask for help before you order.

What features should I look for in a smart lock for security?

Look for a smart lock with anti-snap, anti-drill, and anti-pick features. Some smart lock models use fingerprint or keypad entry. You can also find smart lock options with remote control. D&D HARDWARE recommends checking for certifications like EN1303.

Can I use a smart lock with my existing keys?

Some smart lock designs let you keep your old keys. Others replace the cylinder, so you use only the smart lock. You should check the product details. D&D HARDWARE offers smart lock models that work both ways for your convenience.

For more detailed information about keying and cylinders , click here.

Contact us Now:

Contact: David Jian

Mob: 0086-139 2903 7292

Email: David@dndhardware.com, sales@dndhardware.com

Jobby Zhang

Mob: 0086-137 2599 9617

Email: jobby@dndhardware.com