How to Remove a Broken Tap from Steel: 10 Easy, Tested Methods

Table of Contents#

1. Pre-Work: Safety & Prep Steps Before You Start
2. 10 Easy Methods to Remove a Broken Tap from Steel 2.1 Tap Extractor Set Method 2.2 Penetrating Oil & Pliers Method 2.3 Center Punch & Hammer Method 2.4 Left-Hand Drill Bit Method 2.5 Weld a Nut Method 2.6 EDM (Electrical Discharge Machining) Method 2.7 Penetrating Oil Soak & Mechanical Removal Method 2.8 Grind & Drill Out Method 2.9 Heat & Quench Method 2.10 Screw Extractor (Easy Out) Method
3. Pro Tips to Avoid Breaking Taps in the First Place
4. Frequently Asked Questions
5. References

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1. Pre-Work: Safety & Prep Steps Before You Start#

Before attempting any removal method, follow these steps to avoid injury and prevent damage to your workpiece:

• Safety first: Wear ANSI Z87.1 rated safety glasses, heat-resistant gloves for welding/torching tasks, and chemical-resistant gloves for dissolver methods. Secure your workpiece in a vice or clamp to eliminate movement during removal.
• Clean the area: Clear all metal shavings, cutting oil, and debris from around the broken tap and inside the hole to get a clear view of the tap’s flutes.
• Confirm tap specs: Note the tap’s thread direction (99% of standard taps are right-hand, so you will turn counterclockwise to remove) and core diameter if you plan to drill it out.
• Pre-treat with penetrating oil: Apply a high-quality penetrating oil (PB Blaster, Kroil, or WD-40 Specialist) to the broken tap and let it sit for 15–30 minutes to seep into threads and loosen seized debris.

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2. 10 Easy Methods to Remove a Broken Tap from Steel#

We’ve ordered these methods from least invasive/lowest cost to most advanced, so start with the first method that matches your available tools before moving to more complex options.

2.1 Tap Extractor Set Method#

This is the most widely recommended first step, as it is purpose-built for tap removal and poses minimal risk of damaging existing threads.

What You Need#

• Tap extractor set (matched to your tap size)
• Penetrating oil
• Small ball peen hammer
• Adjustable wrench

Step-by-Step Guide#

1. Align the extractor’s prongs with the flutes of the broken tap. Most extractors have 3–4 prongs that fit standard tap flute sizes.
2. Push the extractor firmly into the hole until the prongs seat fully in the flutes, then tighten the extractor collar to hold the prongs in place.
3. Attach the adjustable wrench to the square end of the extractor, and turn slowly and evenly counterclockwise. Avoid uneven pressure, which can break the extractor prongs inside the hole.
4. If the tap is seized, tap the end of the extractor lightly with the hammer to vibrate oil deeper into the threads, then try turning again.

Best For#

Taps broken flush or slightly above the steel surface with intact flutes, and workpieces where you need to preserve existing threads.

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2.2 Penetrating Oil & Pliers Method#

This is the simplest, no-special-tool method for taps that are not broken deep inside the hole.

What You Need#

• Penetrating oil
• Needle-nose pliers or locking vice grips

Step-by-Step Guide#

1. After letting penetrating oil sit, grip the exposed section of the broken tap as firmly as possible with the pliers or vice grips.
2. Turn slowly counterclockwise, applying even pressure to avoid bending the exposed tap section.
3. If the tap slips, reposition your grip or use a pair of pliers with serrated jaws for better traction.

Best For#

Taps broken at least 1/8 inch above the steel surface, with no damage to the exposed tap section.

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2.3 Center Punch & Hammer Method#

This low-tech method works for small taps in soft steel, with no power tools required.

What You Need#

• Sharp center punch
• Ball peen hammer
• Penetrating oil

Step-by-Step Guide#

1. Place the tip of the center punch on the outer edge of one of the tap’s flutes, angled to push the tap counterclockwise.
2. Tap the end of the center punch gently but firmly with the hammer, moving to different flutes after every 2–3 taps to apply even pressure around the tap.
3. Continue tapping until the tap loosens enough to turn with pliers or an extractor.

Best For#

Small diameter taps (#6 or smaller) in mild steel, broken flush or slightly below the surface.

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2.4 Left-Hand Drill Bit Method#

Left-hand drill bits rotate counterclockwise, so they often grip and unscrew broken taps as you drill, no extractor needed.

What You Need#

• Left-hand cobalt drill bit set
• Center punch
• Power drill (set to low speed)
• Cutting oil

Step-by-Step Guide#

1. Use a center punch to mark the exact center of the broken tap to prevent the drill bit from wandering.
2. Start with a small pilot bit (1/3 the diameter of the tap core) and drill slowly at low speed, applying consistent downward pressure and using cutting oil to reduce heat.
3. Upgrade to larger bits incrementally. In most cases, the counterclockwise rotation will grip the tap and unscrew it automatically before you drill all the way through.

Best For#

Taps broken flush or below the surface, when you don’t have a tap extractor on hand.

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2.5 Weld a Nut Method#

This method uses a welded nut to create a grip for turning the broken tap, and works well for larger taps.

What You Need#

• MIG or TIG welder
• Nut with an inner diameter matching the tap’s outer diameter
• Adjustable wrench

Step-by-Step Guide#

1. Clean the top of the broken tap completely to ensure a strong weld.
2. Center the nut over the broken tap, then weld the inside of the nut to the top of the tap. Avoid welding through the tap to the surrounding steel workpiece.
3. Let the nut and tap cool completely (10–15 minutes) to avoid breaking the weld joint.
4. Turn the nut counterclockwise with an adjustable wrench to remove the tap.

Best For#

Larger diameter taps (1/4 inch or bigger) broken flush with the steel surface, on workpieces that can withstand welding heat.

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2.6 EDM (Electrical Discharge Machining) Method#

EDM uses controlled electrical sparks to erode hardened steel (like tap material) without damaging softer surrounding steel, making it ideal for high-precision jobs.

What You Need#

• Portable EDM machine or access to a local machine shop with EDM services

Step-by-Step Guide#

1. Program the EDM machine to target only the broken tap, matching the tap’s diameter to avoid touching the workpiece threads.
2. Run the EDM cycle to erode the tap into small metal particles, which are flushed out of the hole automatically.
3. Clean the hole and inspect threads for damage once the cycle is complete.

Best For#

High-value, precision workpieces where thread damage would ruin the part, taps broken deep in hard steel, or broken extractors stuck inside taps.

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2.7 Penetrating Oil Soak & Mechanical Removal Method#

Prolonged exposure to penetrating oil can loosen seized taps significantly, allowing for easier mechanical removal without resorting to destructive methods.

What You Need#

• High-quality penetrating oil (PB Blaster, Kroil, or WD-40 Specialist)
• Plastic funnel
• Soft brass or copper pick
• Needle-nose pliers or tap extractor

Step-by-Step Guide#

1. Seal the bottom of the hole if it runs through the workpiece to prevent the oil from leaking out.
2. Fill the hole with penetrating oil using a funnel, ensuring the oil covers the entire broken tap.
3. Let the oil soak for 24–48 hours, reapplying oil as needed to keep the tap submerged. The oil will penetrate rust and corrosion bonds between the tap and steel threads.
4. After soaking, attempt to turn the tap counterclockwise using needle-nose pliers or a tap extractor. If the tap resists, tap the top of the extractor lightly with a hammer to vibrate the oil deeper into threads.
5. If the tap breaks further during removal, use a soft brass or copper pick to extract fragments without damaging threads.

Best For#

Small, deep broken taps in fragile or high-precision workpieces where mechanical removal risks thread damage, and taps that are corroded or seized rather than freshly broken.

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2.8 Grind & Drill Out Method#

This is a more destructive method, but works if you are willing to re-tap the hole after removal.

What You Need#

• Angle grinder (for taps protruding above the surface)
• Cobalt drill bit set (sized to match the tap’s core diameter)
• Drill press (for improved accuracy)
• Cutting oil
• Matching tap to re-thread the hole

Step-by-Step Guide#

1. If the tap protrudes above the surface, grind it flat with an angle grinder to create an even drilling surface.
2. Center punch the exact middle of the tap, then drill slowly with a bit just smaller than the tap’s core diameter, using cutting oil to reduce heat.
3. Once you drill through the tap, the remaining tap fragments will come loose and can be picked out of the threads.
4. Re-tap the hole to clear any damaged threads, or upgrade to a larger thread size if needed.

Best For#

Lower-value workpieces where thread damage is acceptable, or taps that cannot be removed with less invasive methods.

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2.9 Heat & Quench Method#

This uses rapid thermal contraction to loosen seized taps from steel threads.

What You Need#

• Oxy-acetylene torch
• Cold water or quenching oil
• Penetrating oil
• Tap extractor or pliers

Step-by-Step Guide#

1. Heat the broken tap evenly to a bright red color, taking care not to heat the surrounding workpiece more than necessary.
2. Quench the tap immediately with cold water or quenching oil. The rapid contraction will break the corrosion bond between the tap and the steel threads.
3. Apply penetrating oil, then use an extractor or pliers to turn the tap counterclockwise.

Best For#

Thick, non-precision steel workpieces that can withstand high heat, and severely seized taps. Do not use on thin steel or heat-treated parts that may warp.

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2.10 Screw Extractor (Easy Out) Method#

This is a backup method for when tap extractors do not fit or are not available.

What You Need#

• Screw extractor set
• Power drill
• Center punch
• Cutting oil

Step-by-Step Guide#

1. Center punch the middle of the broken tap, then drill a pilot hole deep enough to seat the screw extractor.
2. Tap the extractor into the pilot hole with a hammer until it is firmly seated.
3. Turn the extractor counterclockwise with an adjustable wrench to pull the tap out.

Best For#

Larger taps broken below the surface, when tap extractors are not available. Note: Extractors are very hard and can break easily if you apply uneven pressure.

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3. Pro Tips to Avoid Breaking Taps in the First Place#

The best way to deal with broken taps is to prevent them from happening in the first place:

1. Always use cutting oil when tapping steel to reduce friction and heat.
2. Back the tap out 1/4 turn for every 1/2 turn you advance to clear metal shavings from the flutes.
3. Use sharp, high-quality taps: dull taps require more force and are far more likely to break.
4. Start with a taper tap to create initial threads, then switch to a plug or bottoming tap for deep holes.
5. Use a tap wrench instead of pliers or an adjustable wrench to apply even pressure and avoid side loading the tap.

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4. Frequently Asked Questions#

Q: Can I remove a broken tap from stainless steel?#

A: Yes. For stainless steel, use low-heat, low-impact methods like EDM, tap dissolver, or left-hand drill bits to avoid damaging the harder stainless steel threads.

Q: How much does professional broken tap removal cost?#

A: Professional EDM tap removal costs $50–$150 per hour, with most small tap removals completed in 30 minutes or less.

Q: What if an extractor breaks inside the tap?#

A: Broken extractors are made of hardened steel, so you can remove them with EDM or tap dissolver, just like you would a broken tap.

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5. References#

1. Machinery's Handbook, 31st Edition, Industrial Press, 2020.
2. American Machinist Guide to Tap Maintenance & Removal, 2022.
3. Popular Mechanics: "7 Tricks to Remove a Broken Fastener Without Ruining Your Project", 2023.
4. Manufacturer Product Guidelines: WD-40 Specialist Penetrating Oil, Kroil Penetrating Oil, 2024.
5. Society of Manufacturing Engineers (SME): Best Practices for Tapping Steel Workpieces, 2023.