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Best high strength threadlocker for a metal bolt

Updated: October 2026

You want one bottle that will keep a metal stud shut. The top pick is Loctite 270, the only listing here with a published breakaway torque. The best value is the sitarcmin blue-and-red pair if you also need a medium bottle and can live without that torque. Eight amazon.co.uk listings were read on 15 October 2026 at the GBP prices in that file. The table stays on the [high-strength threadlocker comparison](/hub/cutting-tools/threadlocker-high-strength). The decision before a name is the [buying guide](/hub/cutting-tools/threadlocker-high-strength/sub/threadlocker-high-strength-buying-guide). Colour is [high strength versus medium](/hub/cutting-tools/threadlocker-high-strength/sub/threadlocker-high-strength-vs-medium). Assembly is [how to apply threadlocker](/hub/cutting-tools/threadlocker-high-strength/sub/threadlocker-high-strength-how-to-apply). There was no lab test.

You want one bottle that will keep a metal stud shut. The top pick is Loctite 270, the only listing here with a published breakaway torque.

Our top picks

Nanoxa Nanoxa 50 ml × 2

Best overall

Nanoxa Nanoxa 50 ml × 2
7.0/10about £12.99
View offer
Loctite Loctite 270 50 ml

Rank 2

Loctite Loctite 270 50 ml
8.4/10about £11.50
View offer
sitarcmin sitarcmin 50 ml + 50 ml

Best value

sitarcmin sitarcmin 50 ml + 50 ml
8.1/10about £8.99
View offer
On this page
  1. 1.Top pick: Loctite 270, and who should skip it
  2. 2.Best value: a mid-price twin, not the £3.99 pack
  3. 3.Skip a title that only borrows 243 or 271
  4. 4.What the star lines do not prove

Top pick: Loctite 270, and who should skip it

Loctite 270, ASIN B0068NKI5A, is a green 50 ml tube from Henkel at about £11.50, with 4.6 from 685 reviews. Henkel’s November 2024 data sheet quotes 33 N·m breakaway and prevail to ISO 10964, on M10 steel, after 24 hours at 22 °C. The UK product page quotes a 10-minute fixture, a service range of −55 °C to 180 °C, and NSF P1 registration 123006. None of those figures was measured here. They still make 270 the only bottle you can tie to a published torque. Skip it if you will undo the bolt with hand tools. The listing calls the lock permanent and prints no removal temperature. Skip it if the same order needs a medium bottle. In the 20 UK blocks, nobody describes a leak, a failed cure or a stripped head. One found “FOR SALE IN INDIA ONLY” under a supplier label.

Best value: a mid-price twin, not the £3.99 pack

Best value here means a medium bottle and a high-strength bottle for less than Loctite 270, with a fill you can read and without a UK leak report in the file. That is the sitarcmin pair, ASIN B0FM8FSFSD, at about £8.99, 4.6 from 59 reviews. The title is 50 ml plus 50 ml, blue and red. The manufacturer is WEIKESITA and the model line says 242/262. The materials line says metal. A bullet states −54 °C to 150 °C. Skip this pair if you need a published torque. Do not copy 33 N·m onto 242/262. The unit-count line says 200.0 millilitres, which does not match the title. The about £3.99 packs do not take this place. Flintronic B0FH52BTTS states no fill and weighs 10 g. UK reviews report leaks and one stripped head while undoing a high-strength joint. Flintronic B0GCH88TB2 is titled 2 × 5 ml, with a UK report of leaking lids and a note that two small bottles will not go far. A low price with an unknown or tiny fill is not the better spend.
Nanoxa Nanoxa 50 ml × 2

Testsieger

Nanoxa Nanoxa 50 ml × 2
7.0/10about £12.99
View offer

Skip a title that only borrows 243 or 271

Abnaok, ASIN B0DBQ9PLGG, is about £7.99, titled 2 × 50 ml, 4.5 from 38 reviews, and cheaper than sitarcmin. It is not the best value. The brand is Abnaok, not Henkel, so 243 and 271 on the title are style numbers. They do not bring the 33 N·m sheet, the NSF registration or Henkel’s note on passive metals. The colour field is not a colour. The volume line says 50 millilitres and the unit count says 2.0 gram. One UK reviewer could not tell the permanent bottle from the medium bottle because the labelling was in Chinese. Another found the strong grade did not stop an e-bike axle that rocks. Leave the listing if you cannot read which bottle is permanent.

What the star lines do not prove

GOLDEROC, ASIN B0FN4C6YTT, is about £8.99 and 4.8 from 14 reviews. The five written reviews in the file are headed Germany, so that star line is not British opinion, and 14 ratings do not outrank a data sheet. Nanoxa, ASIN B0F3YZQC67, is about £12.99, 4.7 from 528 reviews, titled 50 ml each. The price sits above Loctite 270, and one UK review says the blue bottle poured. Realth is 10 ml of blue, red and purple. The materials line says plastic, and it is not the high-strength value pick.

Common questions

Which bottle is the top pick if I want a published torque?
Loctite 270, 50 ml, green, Henkel, at about £11.50 in this file. The 33 N·m figure is on Henkel’s data sheet for M10 steel after 24 hours at 22 °C, to ISO 10964. It was not measured here. No other bottle in the eight has a published torque you can cite.
Who should skip Loctite 270?
Skip it if you will undo the fastener with hand tools. The listing calls the lock permanent and gives no removal temperature. Skip it if you need a medium bottle in the same order. One UK bottle in the file had “FOR SALE IN INDIA ONLY” under a supplier label.
Is the cheapest £3.99 pack the best value?
No. Both Flintronic listings are about £3.99. One states no fill, with UK reports of leaks and a stripped head. The other is titled 2 × 5 ml, with a UK report of leaking lids. Best value is the sitarcmin 50 ml plus 50 ml pair at about £8.99. The materials line says metal, and you still do not get a published torque.
Why not treat Abnaok’s 243 and 271 title as Loctite?
The seller is Abnaok. Those numbers do not make the bottle Henkel’s 243 or 271. The 33 N·m figure, NSF P1 123006 and the passive-metal claim stay on Loctite 270. Fill lines on the Abnaok listing disagree, the colour is not stated, and one UK reviewer could not read the strength from Chinese text. A lower price than sitarcmin does not repair that.
Is Nanoxa at £12.99 better because it has more reviews?
It has more stored UK review text than sitarcmin, at 4.7 from 528, and the title states 50 ml in each bottle. The price is higher than Loctite 270, there is no published torque, and the materials line says plastic. It does not replace 270 on torque, and it does not beat sitarcmin on price.

Related pages

How to remove threadlocker

High-strength threadlocker

High strength threadlocker: metal, fill, and torque

How to apply threadlocker before you load the joint

High strength vs medium threadlocker, before colour

Sources

Sources from the research digest. amazon.co.uk listings in this comparison were read on 15 October 2026. We did not run a laboratory test.

  1. Henkel UK, LOCTITE 270 (retrieved 15 October 2026)
  2. Henkel TDS, LOCTITE 270, November 2024 (retrieved 15 October 2026)
  3. Henkel UK, choosing a threadlocker (retrieved 15 October 2026)
  4. Henkel UK, blue, green and purple threadlockers (retrieved 15 October 2026)
  5. Loctite consumer UK, how threadlocker works (retrieved 15 October 2026)
  6. HSE, COSHH basics (retrieved 15 October 2026)
  7. HSE, GB CLP (retrieved 15 October 2026)
  8. Consumer Rights Act 2015, section 9 (retrieved 15 October 2026)