how to remove a stripped lawn mower blade nut

Removing a stripped lawn mower blade nut can be a challenging task, but with the right tools and techniques, it’s possible. Here’s a step-by-step guide to help you remove a stripped nut from a lawn mower blade:

Tools and materials you will need:

  1. Adjustable wrench or socket wrench
  2. Vice grips or locking pliers
  3. Hammer
  4. Penetrating oil (e.g., WD-40 or PB Blaster)
  5. Replacement nut and washer (if needed)


  1. Safety First: Ensure that the lawn mower is turned off, the spark plug wire is disconnected, and there is no gasoline in the tank before working on the blade.
  2. Inspect the Nut: Examine the stripped nut to determine the extent of the damage. If the nut is only partially stripped, it may still be salvageable with the right approach.
  3. Spray with Penetrating Oil: Apply a generous amount of penetrating oil to the stripped nut. Allow it to sit for at least 15-30 minutes. The oil will help loosen rust and corrosion and make it easier to turn the nut.
  4. Use an Adjustable Wrench or Socket Wrench: If the nut is not severely stripped, try using an adjustable wrench or socket wrench to grip the nut firmly. Apply steady, even pressure while turning it counterclockwise (lefty-loosey) to loosen it. Be cautious not to apply excessive force, as this can cause more damage.
  5. Use Vice Grips or Locking Pliers: If the nut is severely stripped and a wrench won’t grip it effectively, use vice grips or locking pliers to clamp onto the nut’s sides tightly. Make sure the tool is securely attached.
  6. Tap the Wrench or Pliers: With the vice grips or locking pliers in place, use a hammer to tap the handle of the wrench or pliers in the counterclockwise direction. The shock from tapping can sometimes help break loose a stubborn nut.
  7. Apply Heat (if necessary): If the nut remains stuck, you can use a propane torch to apply heat to the nut for a few minutes. Heat can help expand the metal and make it easier to turn. Be cautious not to overheat the surrounding area.
  8. Try a Nut Splitter (if available): If all else fails, you can use a nut splitter, which is a specialized tool designed to crack and remove stripped nuts. Follow the manufacturer’s instructions for the nut splitter.
  9. Replace the Nut (if needed): Once you’ve successfully removed the stripped nut, inspect the blade and the mounting area on the mower. If the nut or any part of the blade is damaged, replace them with new parts. Always use the manufacturer-recommended parts for your specific lawn mower model.

Remember to work carefully and patiently to avoid damaging the blade or the lawn mower’s mounting area. If you’re uncomfortable with these steps or if the nut remains stuck, it’s advisable to seek the assistance of a professional lawn mower technician or mechanic.

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