Euro cylinder measuring guide showing how to measure side A and side B from the central fixing screw to determine the correct cylinder size for your door

Not sure which size cylinder you need?

Euro cylinders are measured in two halves, separated by the central fixing screw. Take both measurements from your existing cylinder before ordering, and match them to the size listed above.

A — Internal side
Measure from the centre of the fixing screw to the outer edge of the cylinder on the side that faces inside your home. Common sizes are 30mm, 35mm, 40mm, 45mm, or 50mm.

B — External side
Measure from the centre of the fixing screw to the outer edge of the cylinder on the side that faces outside your home. Common sizes are 30mm, 35mm, 40mm, or 45mm.

Cylinders are typically described as A/B — for example, a 35/45 cylinder has 35mm on the internal side and 45mm on the external side. Get both measurements right and the cylinder will fit your door perfectly.

Still unsure? Send a photo of your existing cylinder to info@homesecureshop.co.uk and we'll match it for you — or call 0151 521 8089 to speak to our team.

Full measuring guide

Which lock is right for your door?

All four fit standard uPVC and composite doors. Swipe to compare →

Compare locks
Our recommendation Avocet ABS 4.98 (47) Rated 4.98 out of 5 from 47 reviews £44.99Trusted and fitted by us for over 10 yearsYou're viewing this
Apecs AP1 review£54.99Top ratings from a newer brandView
Yale Platinum 4.63 (76) Rated 4.63 out of 5 from 76 reviews From £29.99A household name at a great priceView
Standard V5No reviews yet£9.99Budget or internal doorsView
Anti-snap ratingTS007 — what insurers ask for★★★ 3-star★★★ 3-star★★★ 3-starNot rated
Sold SecureIndependent attack testDiamondDiamondNot listed by YaleNot rated
If it's snappedHidden cam locks — door stays shutFront snaps off, cam stays lockedFront snaps off at a set pointNot tested
Key copiesOnly by approved dealers, with your key cardCut to codeKey code on ID cardAny key cutter
One key for all doors✓ YesNot availableNot availableNot available
Guarantee5 yrs + £2,000 snap cover10 yrs + £2,500 break-in cover10 yrs + £3,000 snap coverNone stated

Ratings and guarantees as published by each manufacturer. Snap and break-in cover must be registered with the manufacturer. Reviews are from Home Secure customers.

Product overview

It has been proven that a burglar can gain entry to your property in as little as 13 seconds.

To combat this Avocet has created the 3 Star, British Kitemarked, anti-snap ABS euro cylinder.

ABS is a retrofit product which means you can simply remove your old lock and replace it with ABS

🔑 Want all your locks on the same key?
Choose our Keyed Alike option and we’ll supply multiple cylinders that operate from one single key. View Keyed Alike Options →

  • All cylinder's come with 3 keys as standard
  • Measurements are taken to the centre screw on this lock
  • Snap Secure Technology - Cam locks against the internal locked side of the cylinder making the cylinder impervious to manual attack after snapping
  • ANTI-SNAP, ANTI-DRILL, ANTI-PICK, ANTI-DRILL
  • TS007 3 star rating
  • Insurance recommended British Kitemark™ stamp
  • Master Locksmith Association's Sold Secure Diamond standard

Please Note: 30mm cylinders do not display a kitemark due to reduced numbers of key combinations. 30mm cylinders do still snap off at the sacrificial point in front of the cam , this ensures an intruder cannot gain access into the lock case.


Delivery & Returns

How much is delivery?

UK Mainland Delivery is £2.99 on all items no matter how many you order!

Northern Ireland, Scottish Highlands, Channel Islands £6.00.

We do not offer International Delivery (Ireland, France, Spain etc).

When will my order be dispatched?

Orders before 3pm (Monday to Friday) are usually dispatched same day but may take up to 24 hours.

When will I receive my item?

We ship on 2 working day courier. Fully Tracked. Tracking will be emailed on dispatch. 

Special order items such as keyed alike locks will take longer to dispatch. Please refer to product description for lead times. 

I haven't received my item?

Please email us your name, order number and date of purchase.

We prefer email as it allows us time to research and respond.

Returns Information

We operate a 30 day refunds and return policy. 

If you change your mind you must return the product back to us within 30 days of delivery

Please include a copy of your invoice and a note stating reason for return. 

Additional keys, locks keyed alike or built to code are non refundable as they are personalised made to order goods.

Any refund, which is due to a fault or other defect, will include a refund of the applicable delivery charges otherwise not. 

It is the buyers responsibility to arrange the return of goods to us. We do not offer a collection service for returning items. 

Items must be returned including original product packaging and accessories.

We reserve the right to refuse any returns that do not comply with this policy.

Please post returns to the following address:

Home Secure (Online)

Unit 5, Brookfield Drive

Liverpool, L9 7AJ

United Kingdom