How do you remove a badly stripped bolt?

1. Use a Screw Extractor or Easy-Out Tool

A stripped bolt lacks grooves for grip, so specialized tools like screw extractors or Easy-Out bits are essential. Start by drilling a small hole into the center of the bolt using a drill bit slightly smaller than the extractor. Tap the extractor into the hole with a hammer, then reverse the drill to remove the bolt. For stubborn cases, use an Easy-Out bit, which spirals inward to grip the metal. Always secure the bolt with a wrench or vise grips to prevent rotation during the process.

2. Apply the Impact Driver Method

If the bolt head is partially intact, an impact driver can sometimes break the bond between the bolt and surrounding material. Attach a deep socket to the driver, position it firmly on the bolt, and apply sudden force. The shock may loosen the threads enough to unscrew the bolt manually. For extra grip, clean the stripped area with a wire brush and apply penetrating oil like PB Blaster before attempting this method.

3. Use Epoxy or Threaded Inserts

For severely stripped bolts, inject epoxy adhesive into the threads and allow it to cure. Once hardened, the epoxy creates a new surface for grip, enabling you to unscrew the bolt with pliers or a wrench. Alternatively, insert a threaded insert into the stripped hole, let it bond with superglue, and use an appropriately sized nut to pull the bolt free. These methods work best when the bolt is still partially embedded.

4. Cut the Bolt with a Dremel or Hacksaw

If the bolt is completely stripped, use a rotary tool (Dremel) or hacksaw to cut through the head, creating new grooves. Once cut, insert a screwdriver tip or hex key into the grooves and turn counterclockwise. For deeper bolts, a cutting wheel can slice through the shaft, allowing you to grip and twist the remaining piece out. Always prioritize safety with protective eyewear and steady pressure.

How do you remove a rounded off bolt?

1. Use a Drill and Step Bit to Create a Grip

A common method involves drilling into the center of the rounded bolt to attach a removal tool. Start by drilling a small pilot hole using a drill bit slightly smaller than the bolt’s diameter. Next, insert a step bit or a spiral drill bit to enlarge the hole, creating a conical shape. Once the hole is deep enough, screw in a machine screw or a bolt extractor into the drilled hole. Use a wrench or socket to turn the tool counterclockwise, pulling the bolt out. For stubborn cases, a tap-and-die set can cut new threads into the bolt, allowing a screwdriver or extraction tool to grip it.

2. Apply Mechanical Methods with Pliers or a Tap

If drilling isn’t an option, try mechanical tools. Use locking pliers (like Vice-Grips) to bite into the rounded surface, then twist counterclockwise. For partially accessible bolts, insert a tap into the threads and tap it lightly with a hammer to secure it. Once the tap is firmly in place, turn it backward with a wrench. Another option is using a cheater tube (extension bar) on a wrench to add leverage, but avoid overforce to prevent further damage.

3. Employ Epoxy or Adhesive for a Temporary Bond

Mix a small amount of epoxy adhesive and apply it to the rounded bolt head. Press a nut, screw, or bolt into the epoxy, allowing it to cure fully (typically 24 hours). Once set, use the newly attached piece as a handle to turn the bolt. Alternatively, insert a carbide insert bit into the bolt head and secure it with epoxy, then unscrew it with a wrench. This method works best on non-structural bolts, as the adhesive may weaken the material’s integrity.

4. Try a Bolt Extractor Kit or Impact Wrench

A bolt extractor kit includes left-handed taps or spiral screws designed to grip the bolt internally. Insert the extractor into the bolt’s threads, then turn it clockwise to pull the bolt out. For metal bolts, applying heat with a torch can expand the metal, making threads more accessible. Let the bolt cool slightly before attempting to turn it, as contraction may tighten the grip. An impact wrench with a high torque setting can also break the bolt’s resistance, but use caution to avoid stripping threads further.

Use penetrating oil like WD-40 or PB Blaster to lubricate the threads before attempting removal. Always prioritize safety by securing the workpiece and wearing protective gear. If the bolt is in a critical component, consult a professional to avoid damaging surrounding materials.

What to do when a bolt won't loosen?

What to do when a bolt won’t loosen?

1. Apply Penetrating Oil

Start by spraying penetrating oil (like WD-40 or PB Blaster) around the bolt’s threads. Let it soak for 15–30 minutes to break down rust and corrosion. Use a brush to work the oil into tight spaces. After soaking, wiggle the bolt or tap it lightly with a hammer to dislodge it. This method often loosens bolts stuck due to oxidation or dirt.

2. Increase Torque Gradually

Attach a socket wrench to the bolt and use a breaker bar or extension to add leverage. Turn slowly in the loosening direction, applying steady pressure. If resistance persists, try rocking the bar slightly or hitting the end of the wrench with a rubber mallet to create vibrations that help break the bond. Avoid over-tightening, as this can strip the bolt.

3. Use Heat or Temperature Changes

Heat expands metal, so apply a propane torch to the bolt and surrounding area for 1–2 minutes. Let it cool slightly, then try loosening it immediately. For stubborn bolts, alternate heating with freezing: spray the bolt with aerosol freeze spray or wrap it in ice, then tighten briefly before loosening. This contracts the metal, creating slack in the threads.

4. Address Stripped or Damaged Heads

If the bolt head is stripped, use a hex socket or a penetrating bit in a drill to grip it. For deeply rusted bolts, drill the center with a metal-cutting bit, then insert a screw extractor or a screwdriver to turn it counterclockwise. As a last resort, cut the bolt off with a hacksaw, but this may damage the surrounding material. Always prioritize safety when using power tools.

How do you remove a bolt that has been sheared off?

1. Use a Drill and Extraction Tool

Start by drilling a central hole into the sheared bolt using a center drill bit or a high-speed steel (HSS) drill bit. Choose a drill bit slightly smaller than the diameter of the bolt. Once the hole is drilled, insert an easy-out tool or spiral-type extraction bit into the hole. Turn the extraction tool counterclockwise with a wrench or socket. The threads of the extraction tool will grip the bolt, allowing you to unscrew it. Always secure the workpiece and wear eye protection during this process.

2. Apply the Impact Method

If the bolt is still intact but stuck, use a hammer and center punch to drive the remaining bolt shank out. Tap the punch gently into the center of the bolt head, then strike it with a hammer to loosen corrosion or debris. Apply penetrating oil (like PB Blaster or WD-40) and let it soak for several hours. Use a wrench to turn the bolt while tapping it with a hammer to break the bond and remove it.

3. Cut or Grind the Bolt

For severely sheared bolts, use a rotary tool with a cutoff wheel or a die grinder to cut through the bolt’s remaining shank. Alternatively, a toothed cutting wheel can score the bolt’s surface, creating grooves for a wrench to grip. Work slowly to avoid overheating or damaging the surrounding material. Once weakened, try twisting the bolt free. If all else fails, consider cutting the bolt flush and replacing it with a new threaded insert.

Use a heat gun or torch to expand the bolt’s metal, then quench it with oil to contract it, loosening the bond with the surrounding material. This method is riskier but effective for stubborn cases. Always prioritize safety when using heat or power tools.