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Best thumbturn euro cylinder for the size you measured

Updated: October 2026

You are on amazon.co.uk with four knob cylinders in front of you, and a 4.6 rating looks like a winner. A best thumbturn euro cylinder is only best for a job you have already measured: the split on the door, a turn that the listing actually describes, and a door where nobody outside can reach that turn. The [knob cylinder comparison](/hub/hot-water/knob-cylinder) holds the four listings captured on 19 October 2026. None prints TS 007, a Kitemark or Sold Secure. This page says who each one is for, and when you should leave the set. We did not laboratory-test a cylinder. A qualifying purchase through our links can earn a commission at no extra cost to you.

You are on amazon.co.uk with four knob cylinders in front of you, and a 4.6 rating looks like a winner.

Our top picks

GANZTECH GANZTECH 30/40T chrome

Best overall

GANZTECH GANZTECH 30/40T chrome
8.6/10about £10.99
View offer
Valorada Valorada 55/45T thumb turn

Rank 2

Valorada Valorada 55/45T thumb turn
5.5/10about £13.99
View offer
BGS BGS 85290 rotary knob 45/45

Best value

BGS BGS 85290 rotary knob 45/45
8.3/10about £6.55
View offer
On this page
  1. 1.No top pick for a front door inside this set
  2. 2.GANZTECH if you already measured 30/40T and accept an unrated cylinder
  3. 3.BGS and Valorada for a stated size, with the conflicts
  4. 4.RUCUDIM is not a recommendation
  5. 5.What to buy instead when the door is a final exit

No top pick for a front door inside this set

West Yorkshire Police describe a euro-cylinder upgrade as a TS 007 3-star cylinder, or a 1-star cylinder with 2-star security furniture, or Sold Secure Diamond under SS312. A bullet that says anti-bump or fireproof is not that mark, and an amazon.co.uk star rating is a review average, not a Kitemark. On 19 October 2026 every listing here left the standard line blank. If this door is a final exit, the honest order is outside the table, at roughly £30 to £55 for a named 3-star thumbturn, after you have measured. What those stars have to show is on TS 007 and a knob cylinder.

GANZTECH if you already measured 30/40T and accept an unrated cylinder

The GANZTECH title, ASIN B0GS5VFV7S, is a chrome 30/40T, 70 mm, sold as a key knob with five keys at £10.99. It is the top pick when you measured 30 mm and 40 mm, the turn belongs on the 40 mm side, and you accept an unrated cylinder. One reviewer found it loose and passed it on. Listed dimensions of 50 x 50 x 10 mm cannot be a 70 mm cylinder. Bullets claim anti-pry, anti-drill, anti-bump and fireproof with no TS 007 number.
GANZTECH GANZTECH 30/40T chrome

Testsieger

GANZTECH GANZTECH 30/40T chrome
8.6/10about £10.99
View offer

BGS and Valorada for a stated size, with the conflicts

The BGS 85290 states 45/45 and 90 mm, a fixed knob of 22 x 18 mm, five keys and two screws, at £6.55, with 4.3 from 70 ratings. Five UK texts call it easy to fit. No security standard is printed. It is the best value when you measured 45/45, and a weak choice on a final exit. Valorada is the long split, 55/45T and 100 mm at £13.99, with 4.5 from only ten reviews. One bullet says the thumb turn is not included, while the title says it is. Open the parcel before you rely on the knob.

RUCUDIM is not a recommendation

The RUCUDIM title says a 30/30 profile knob cylinder with five keys at £6.89. The bullets describe a double-open key cylinder, which is not a thumbturn. The line is 4.2 from 117 ratings, with no United Kingdom review text, and overall length is not printed. Treat the knob as unconfirmed until the photographs and the parcel agree. Size and function, before you trust a title, are on the thumbturn euro cylinder buying guide.

What to buy instead when the door is a final exit

Leave this set when the door is a final exit and you want the upgrade West Yorkshire Police describe. On 19 October 2026, named thumbturns outside this table included an UPVCSTORE title at £29.99 and an Avocet ABS Quantum at £54 described as TS 007 3-star and Sold Secure Diamond. A reachable knob fails the same way at £7 or at £54. Settle that on thumbturn or key both sides. If your split is 35/35, none of these four titles is that size.

Common questions

Which of the four is the top pick, and for whom?
In this set the top pick is the GANZTECH 30/40T at £10.99 when you have measured 30 mm and 40 mm and you accept an unrated cylinder. The score rests on 4.6 from 273 ratings and a stated size, not on a tested lock. The BGS 45/45 at £6.55 is the best value when that equal split is yours. Neither is a front-door upgrade.
Is the RUCUDIM a thumbturn at all?
You cannot tell from the page alone. The title says a 30/30 profile knob cylinder. The bullets describe a double-open key cylinder, which still uses a key on the inside and can be turned when another key is already in. There is no United Kingdom review text in the file to settle it. Until the photos and the parcel show a knob, do not buy it as a thumbturn, even at £6.89.
Does the Valorada include the knob?
The title, the model name and the item highlight say thumb turn. One bullet says the thumb turn is not included. Reviews describe people using the inside without a key, and a bullet that contradicts the title is still a reason to check the tin. At 4.5 from only ten reviews, that file is too small to treat the conflict as resolved.
When should I leave this set and buy a named 3-star thumbturn?
Leave when the door is a final exit, you have chosen a thumbturn because nobody outside can reach the knob, and you have measured both sides from the fixing screw. On 19 October 2026 named options sat roughly between £29.99 and £54, including Yale Platinum Ultra from £34.39. Confirm the mark is printed for the size you need. A 30 mm external Avocet in that Quantum range is a size the seller says is not Kitemarked.
Is the BGS good enough for a gate or a shed?
For a low-risk gate or shed, where you measured 45/45 and you are not meeting a 3-star upgrade, the BGS at £6.55 is the clearest cheap knob in this set. Five UK texts praise the fit and the price, and one would rather shop at Screwfix. It is the wrong cylinder if the split is not 45/45, or if the door is a final exit.

Related pages

How to fit a knob cylinder

Knob cylinder

Thumbturn euro cylinder: the checks before you pay

TS007 3 star thumbturn: what the listing must show

Thumbturn or key both sides: which cylinder to order

Sources

Public UK sources named below. amazon.co.uk prices, stars and review counts on these four listings were read on 19 October 2026. Page updated 21 October 2026.

  1. West Yorkshire Police euro cylinder advice (retrieved 19 October 2026)
  2. Secured by Design: locks and associated hardware (retrieved 19 October 2026)
  3. DHF thief-resistant lock assemblies (retrieved 19 October 2026)
  4. DHF TS 007 star ratings (retrieved 19 October 2026)
  5. BSI BS 8621:2017+A1:2024 (retrieved 19 October 2026)
  6. Cheshire Fire and Rescue: houses in multiple occupation (retrieved 19 October 2026)
  7. ERA fitting instructions (retrieved 19 October 2026)
  8. Checkatrade: changing a uPVC door lock (retrieved 19 October 2026)
  9. amazon.co.uk listings B0D5HY325L, B0CLV6BMNX, B0GS5VFV7S and B0H14R6SPH (retrieved 19 October 2026)