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
Product overview

The Yale Platinum Ultra 3 Star thumb turn is an anti-snap euro cylinder with a key on the outside and a turn on the inside, so you can lock and unlock from inside without a key. It is Kitemarked to TS007:2014 3 star and rated Sold Secure Diamond, so it gives the full 3-star rating on its own.

The Platinum Ultra is Yale's new version of the Platinum, which Yale no longer makes.

It comes with 3 keys as standard and a key code card, so spare keys can be cut to code.

Security features

  • British Kitemarked TS007:2014 3 star, independently tested by BSI
  • Sold Secure Diamond (SS312), Sold Secure's top grade for cylinders
  • Anti-snap
  • Anti-drill protection
  • Anti-bump protection
  • Anti-screw protection
  • Tested to BS EN1303:2005
  • £1,000 anti-snap guarantee from Yale (activate it free at help.yale.co.uk)
  • 10 year guarantee with Yale

Sizes and finishes

  • Type: thumb turn euro cylinder (key outside, turn inside). Need a key on both sides? See the Yale Platinum Ultra key-both-sides cylinder.
  • Finishes: Bright Nickel or Polished Brass
  • Sizes: 35/35, 40/40, 45/45 and 50/50mm (choose the size above)
  • Keys: 3 high security horizontal dimple keys, supplied with a barcode ID tag
  • Suits: replacement on uPVC, timber and composite doors

Is a thumb turn right for my door?

A thumb turn makes it quick to get out in an emergency. Avoid one where someone could reach the turn through a letterbox, cat flap or a small glass pane. In those doors, choose a key-both-sides cylinder instead.

How to measure

Euro cylinders are measured from the central fixing screw to each end. Measure the inside (A) and outside (B) and note which side the turn goes. Our euro cylinder measuring guide shows each step.

More keys or one key for every door?

Extra Yale Platinum keys can be cut to the code on your key card. Yale Platinum isn't available keyed alike: if you want one key for every door, see the Avocet ABS thumb turn keyed alike. Compare all thumb turn cylinders.

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 2pm (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

Frequently Asked Questions

TS007 is the British standard for anti-snap euro cylinders. A 3-star cylinder gives the full rating on its own. A 1-star cylinder needs 2-star security handles to reach 3 stars. The Yale Platinum Ultra thumb turn is Kitemarked to TS007:2014 3 star and also rated Sold Secure Diamond.

A thumb turn lets you lock and unlock from inside without a key, so it's quick to get out in an emergency. Avoid one where someone could reach the turn through a letterbox, cat flap or small glass pane. In those doors, choose a key-both-sides cylinder.

The turn always goes on the inside of the door and the key on the outside. Measure the inside (A) and the outside (B) of your old cylinder and choose the matching size.

Undo the fixing screw in the edge of the door and take the old cylinder out. Measure from the centre of the screw hole to the inside end (A) and to the outside end (B). A 40/50 cylinder is 40mm inside and 50mm outside. Sizes must match exactly: a 40/50 is not the same as a 50/40. Our euro cylinder measuring guide has photos of each step.

3 keys come as standard, with a key code card. Extra keys can be cut to the code on your card. Yale Platinum isn't available keyed alike. For one key for every door, see the Avocet ABS thumb turn keyed alike.