How To Loosen Rusted Bolts with a Torch

Loosen Rusted Bolts

Use a Bernzomatic torch and a little elbow grease to loosen frozen, rusted or stubborn nuts and bolts.

  • For stubborn bolts, heat the bolt, then move the flame away and apply WD-40 against the heated bolt threads. The melting wax pulls itself into the threads to create a slippery surface.
  • Keep open flames away from fuel and brake lines, rubber fittings and other flammable parts and materials.
Tips
  • Read our General Safety Precautions before starting your project.
  • Read the instructions that come with your torch before beginning your project

Steps

  1. Check thoroughly to ensure there are no flammable materials such as plastic or fabric in close proximity to the bolt you’ll be heating.
  2. Apply penetrating oil to the bolt and give it a few minutes to sink in. Use a rag to soak up and remove any residual oil.
  3. Turn on your torch and aim the flame directly at the bolt head. Move the flame in a circle around the bolt for 30 seconds.
  4. Use a socket wrench to rock the bolt back and forth until it loosens enough to be removed. The bolt is stubborn, repeat steps 2 and 3.

What You'll Need


TS8000
TS8000

Max Heat Torch for Faster Work Times

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MG9
MG9

14.1 oz. MAP-Pro™ Hand Torch Cylinder

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TOOLS

  • TS8000-Max Heat Torch for Faster Work Times
  • Bernzomatic 14.1 oz. MAP-Pro™ Hand Torch Cylinder
  • Keep a fire extinguisher or water source nearby in case of emergency.
  • Safety glasses
  • Work gloves
  • Wrench

MATERIALS

  • Penetrating oil
  • Rag
  • Wax stick (optional)
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