How to Loosen Rusted Bolts with a Torch

Loosen Rusted Bolts

TS8000-Max Heat Torch for Faster Work Times

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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 in the Information Center before starting your project.
  • Read the instructions that come with your torch before beginning your project.

WHAT YOU'LL NEED

CATEGORY: Construction

Tools

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

Materials

  • Penetrating oil
  • Rag
  • Wax stick (optional)
  1. Step 1Check thoroughly to ensure there are no flammable materials such as plastic or fabric in close proximity to the bolt you’ll be heating.
  2. Step 2Apply 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. Step 3Turn 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. Step 4Use 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.