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How to remove threadlocker

Updated: October 2026

The fastener will not move, and you need to know whether a spanner is enough or whether heat comes next. How to remove threadlocker depends on the strength that was used. Medium grades are meant to shear with hand tools. High-strength grades are loosened with localised heat and then undone while they are hot. Forcing a cold bolt in a tapped hole can snap it. Peter F. used Henkel's UK removal article, Loctite's consumer guide, and the listings in the [threadlocker comparison](/hub/diy-supplies/threadlocker). He did not run a lab test. A qualifying purchase can earn us a commission at no extra cost to you.

The fastener will not move, and you need to know whether a spanner is enough or whether heat comes next. How to remove threadlocker depends on the strength that was used. Medium grades are meant to shear with hand tools.

Our top picks

Bäder Bäder B270Eco high green, 10 ml

Best overall

Bäder Bäder B270Eco high green, 10 ml
7.6/10about £5.45
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Bäder Bäder B243Eco medium blue, 10 ml

Rank 2

Bäder Bäder B243Eco medium blue, 10 ml
8.4/10about £5.39
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kintsukuroi kintsukuroi medium blue, 50 ml

Preis-Tipp

kintsukuroi kintsukuroi medium blue, 50 ml
6.9/10about £8.88
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On this page
  1. 1.Start with the strength you used
  2. 2.Hand tools
  3. 3.Heat, and the two temperatures
  4. 4.After the bolt is out
  5. 5.When you do not heat it yourself

Start with the strength you used

If you know the bottle, use that memory before you reach for heat. A medium blue, or any grade the listing called removable with hand tools, is a tool job. A high-strength red or a high-strength green is a heat job. Colour codes are not universal, so the word on the old bottle matters more than a chart from another country. If you do not know the colour, start with hand tools rather than a flame. If the bolt is in a blind hole and will not move, stop. Henkel warns that a cold bolt in a tapped hole can break. Brakes, steering, suspension, and fuel fasteners go to a mechanic before any heat. Which dye you should have chosen is on blue vs red threadlocker.

Hand tools

On a low or medium grade, ordinary tools are the method Loctite's consumer guide describes. kintsukuroi's bullet says common hand tools, and a UK review names screwdrivers and spanners. A review of the purple Bäder bottle says a screwdriver still undoes it, with extra force, though that listing prints both low and medium. If a medium joint will not move, add torque, and use heat only if it still will not shift. A review of the 50 ml Bäder blue says larger threads needed heat or extra leverage. That is one report, not a reason to heat every blue bolt first. If the bolt twists instead of turning, more force is how it snaps.
Bäder Bäder B270Eco high green, 10 ml

Testsieger

Bäder Bäder B270Eco high green, 10 ml
7.6/10about £5.45
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Heat, and the two temperatures

The sources do not share one number. Loctite's UK consumer guide describes about 230 °C for about five minutes, then a wrench, with gloves. Henkel's UK removal article says localised heat greater than 250 °C, then undo while hot. Professional Motor Mechanic uses about 250 °C while hot. Do not average them. Neither figure is printed on the Bäder, Nanoxa, or sitarcmin listings. Undo the fastener while it is hot. Wear gloves, and keep the heat off plastic, paint, and fuel vapour. A flame near a fuel line or a brake hose is the wrong tool. For a plain steel bracket in a vice, away from fuel and plastics, the published method is localised heat and tools while the metal is hot. If you cannot do that without scorching something you need, stop.

After the bolt is out

Solvent does not unlock a high-strength joint that is still assembled. Henkel says a soak will not reach the cured film while the bolt is in place. Clean after the fastener is out, with a wire brush or a tap in the female thread. Henkel names Loctite SF 7200 for cured residue on its own products. That is not a claim that the same solvent shifts Bäder or Nanoxa film. Leave the part to cool before you brush it. First application, if you are starting from a clean thread instead, is on how to apply threadlocker.

When you do not heat it yourself

Do not heat brakes, steering, suspension, or fuel fasteners yourself. The grade does not change that. The same stop applies if the bolt will not move after a sensible tool effort and you do not know the grade. If the joint was medium and it came apart with tools, you do not need heat. If you now want a grade you can undo next time, use the threadlocker buying guide. Heat is for the high-strength film you already used, on a part you can heat safely.

Common questions

Can you undo medium blue with a spanner?
Yes, that is what the medium grades are for. Loctite's consumer guide says ordinary tools for low and medium strength. kintsukuroi's bullet says common hand tools, and reviews of the Bäder 10 ml blue say buyers could still undo the screws. A larger or corroded thread can need more leverage. If it will not move at all, it may not have been a medium grade.
What heat do the sources give for high strength, and why are there two figures?
Loctite's UK consumer page describes about 230 °C for about five minutes. Henkel's UK removal article says localised heat greater than 250 °C, and Professional Motor Mechanic says about 250 °C while the fastener is hot. They are different documents. Use the figure from the source you are following, undo the bolt while it is hot, and do not invent a midpoint.
Will solvent loosen a bolt that is still assembled?
Henkel says no for a cured high-strength film. The liquid cannot reach the lock while the threads are still together. Solvent and a wire brush, or a tap in the female thread, come after the bolt is out. Loctite SF 7200 is Henkel's named product for cured residue on its own grades, not a proven remover for every brand in this set.
What if you do not know which colour was used?
Start with a well-fitting hand tool and gradual force. Do not begin with a flame. If the bolt is in a tapped hole and will not move, stop before you snap it. Heat is the next step only on a part you can heat safely, and not on brakes, steering, suspension, or fuel. A clear Loctite tube never told you a colour, so the same tool-first rule applies.
When is heat the wrong tool in a driveway?
When the fastener is on the brakes, steering, suspension, or fuel system, and when plastic, paint, or fuel vapour is in the way of the flame. Also when you cannot keep the heat local. A stuck garden-tool bracket in a vice is a different risk from a caliper bolt. Take the vehicle cases to a mechanic.

Related pages

Threadlocker medium strength comparison

Threadlocker

Best threadlocker for bolts you will undo with tools

Blue vs red threadlocker: hand tools or later heat

Threadlocker buying guide: strength, colour and fill

How to apply threadlocker on a metal household bolt

Sources

Public UK sources on colour codes, cure, removal temperatures, COSHH and GB CLP. Listing prices, stars and review themes are from the amazon.co.uk extracts dated 15 October 2026. Prices move.

  1. Henkel UK, blue, green and purple threadlockers (retrieved 15 October 2026)
  2. Loctite consumer UK, how threadlocker works (retrieved 15 October 2026)
  3. Henkel, how to remove high-strength threadlocker (retrieved 15 October 2026)
  4. LOCTITE 243 technical data sheet (retrieved 15 October 2026)
  5. LOCTITE 270 technical data sheet (retrieved 15 October 2026)
  6. ISO 10964:1993, torque method (retrieved 15 October 2026)
  7. HSE, COSHH assessment (retrieved 15 October 2026)
  8. Control of Substances Hazardous to Health Regulations 2002 (retrieved 15 October 2026)
  9. HSE, GB CLP (retrieved 15 October 2026)