How to Remove a Stripped Bolt: 10 Simple Methods

Whether it is rusted, painted over, or just plain stubborn, a stuck bolt can feel like a disaster. But don’t reach for the drill just yet. There are several ways to coax that fastener out without destroying the threads or your sanity.

In this guide, we will walk through 10 proven methods to remove a stripped bolt, ranging from simple hand tools to heavy-duty heat and extraction techniques. Let’s get that bolt out so you can finish your project.

How to Remove a Stripped Bolt

The right method depends on how badly the bolt is stripped and where it is located. We will start with the least invasive techniques and work our way up to the “nuclear options.”

Method #1: Impact Force

Before you get fancy, try brute force. Rust acts like a glue, and a sharp, sudden shock can shatter that bond. This is often all you need to get things moving.

Here is how to shock it free:

• Manual shock: Take a flat punch or a chisel and place it on the center of the bolt head. Strike it firmly with a hammer several times.
• Impact driver: If you have an impact driver (not just a drill), use it. The rapid percussive hammering is designed specifically for this scenario.

Method #2: Heat

Physics is your friend here. When metal gets hot, it expands; when it cools, it contracts. rapidly changing the temperature can break the corrosive seal holding the bolt in place.

You have two main approaches for using heat:

Heat the Bolt

Use a propane or MAP gas torch to heat the bolt head directly. Get it hot enough to expand (but be careful near plastic or painted parts). Let it cool slightly, then hit it with a penetrant like WD-40 or Kroil. The cooling metal will suck the oil deep into the threads.

If standard penetrating oil doesn’t work, try CRC Freeze-Off. It freezes the bolt instantly to crack the rust while delivering a lubricant.

Heat the Housing

Sometimes it is better to heat the metal surrounding the bolt. This expands the hole, effectively making it larger than the bolt itself. While the metal is expanded, try to turn the bolt. This is particularly effective on aluminum housings with steel bolts.

Method #3: Relief Cuts (The Slot Method)

If the wrench keeps slipping because the head is rounded, you need to create a new way to grip it. This is where a rotary tool (like a Dremel) or a hacksaw comes in handy.

Cut a deep, straight slot across the top of the bolt head. You have now effectively turned your rounded bolt into a large flathead screw. Use the largest flathead screwdriver you have to turn it out.

For extra torque, you can use a chisel in the slot and tap it counterclockwise with a hammer to get it started.

Method #4: Bolt Extraction Sockets

If you do a lot of car work or DIY, you need a set of bolt extraction sockets. These are lifesavers for rounded heads.

These sockets have spiraled flutes inside that dig into the metal of the bolt head. As you turn your ratchet counterclockwise to loosen the bolt, the socket bites down harder. The more force you apply, the tighter it grips.

simply hammer the extractor socket onto the rounded bolt head, attach your ratchet, and turn. This is often the most reliable method before you have to start drilling.

Method #5: Rocking the Bolt

If you can get a grip on the bolt but it only moves a tiny bit, do not force it all at once. You risk snapping the head off completely.

Instead, work the bolt back and forth. Tighten it slightly, then loosen it. Repeat this process, moving it a little further each time. This “rocking” motion helps clear the rust and debris from the threads.

Generously apply penetrating fluid during this process. The back-and-forth motion helps work the oil down into the threads where it is needed most.

Method #6: Drill It Out

If the head has snapped off flush with the surface, drilling is your only option.

Here is the safest way to do it:

1. Center punch: Mark the exact center of the bolt with a center punch. This prevents your drill bit from wandering and damaging the threads.
2. Left-handed bits: Use a left-handed drill bit. This is a pro tip. As the drill spins counterclockwise to cut, the torque and heat often catch the bolt and spin it right out.
3. Start small: Begin with a small pilot hole, then step up to larger bits until you are close to the thread walls.
4. Pick it out: Once the bolt shell is thin enough, you can often pick the remaining metal out with pliers or a scribe.

Method #7: Spiral Screw Extractor

This works in tandem with drilling. A spiral extractor (often called an “easy-out”) is a tapered, reverse-threaded bit designed to jam into a hollowed-out bolt.

Drill a pilot hole into the center of the stuck bolt. Tap the extractor into the hole with a hammer. Attach a handle or wrench to the extractor and turn it counterclockwise.

Because the extractor is reverse-threaded, it pulls itself deeper into the hole as you turn, eventually transferring enough torque to back the bolt out. Warning: These extractors are hard but brittle. If you snap one off inside the bolt, it is incredibly difficult to drill out.

Method #8: Pipe Wrench

For larger bolts or studs where the head is rounded but still accessible, a pipe wrench is a classic solution.

Pipe wrenches have self-tightening teeth. As you pull on the handle, the jaws clamp down harder. Position the wrench on the bolt head or exposed stud and pull. The teeth will dig into the metal, creating a high-friction grip that standard wrenches can’t match.

Method #9: Weld a Nut

This is the “magical” fix if you have access to a welder. It works on bolts that are broken off flush or completely rounded.

Find a nut that is roughly the same diameter as the bolt. Place it over the bolt head (or the flush surface). Use a MIG welder to fill the inside of the nut, welding it firmly to the stuck bolt.

This accomplishes two things:

• It gives you a brand new, clean hex head to put a wrench on.
• The intense heat from the welding process travels down the bolt, expanding it and breaking the rust bond almost instantly.

Method #10: Air Hammer/Chisel

If you have an air compressor, an air hammer with a chisel bit can vibrate a stubborn bolt loose.

Place the chisel edge against the outer rim of the bolt head (or a notch you cut into it). Pull the trigger and apply pressure in the counterclockwise direction. The vibration alone is often enough to shatter the rust, while the chisel drives the bolt around.

This requires a steady hand, so be careful not to slip and gouge the surrounding surface.

FAQs

Why Do Bolt Threads Strip?

Threads usually strip due to overtightening, cross-threading (forcing the bolt in at an angle), or using the wrong size fastener. Corrosion can also weaken the threads over time, causing them to crumble when you try to remove the bolt.

Can You Fix Stripped Threads on a Bolt?

Yes, but it depends on the damage. If the threads are just slightly flattened, you can run a “die” tool over the bolt to reshape them. If the threads are completely sheared off, the bolt is ruined and must be replaced.

Does WD-40 Help Remove Stripped Bolts?

Standard WD-40 is a water displacer, not a true penetrant. While it helps slightly, you are better off using a dedicated penetrating oil like PB Blaster, Kroil, or WD-40 Specialist Penetrant. These are chemically designed to creep into tight rusted gaps.

What Are the Best Drill Bits for Drilling Out Bolts?

Cobalt drill bits are the gold standard for hardened steel bolts because they dissipate heat well and stay sharp. For the best results, use left-handed cobalt bits; the reverse spinning motion often unscrews the bolt while you drill.

What Is the Best Tool to Remove a Stripped Bolt?

For rounded heads, a “bolt extractor socket” (like the Irwin Bolt-Grip) is the best non-destructive tool. For broken bolts, a welder (welding a nut on) is the most effective professional method, followed by left-handed drill bits.