Dealing with a stubborn, stripped, or broken bolt can be one of the most frustrating challenges in any DIY project or professional repair. When a bolt won’t budge or its head is compromised, knowing how to drill it out effectively is a crucial skill. But it’s not just about any drill bit; you need the best drill bits for drilling out bolts that are specifically designed for the task. These specialized bits, often made from hardened steel and featuring reverse threads or unique geometries, are engineered to grip and extract damaged fasteners without causing further headaches. In this comprehensive roundup, we delve into the top drill bit sets that will help you tackle even the most intractable bolts, ensuring your projects stay on track and your sanity remains intact.
Quick Product Comparison
Our Top 5 Best Drill Bits For Drilling Out Bolts Reviews – Expert Tested & Recommended
1. Impact Extractor Set with Left Hand Drill Bits for Drilling Out Damaged Stripped Bolts
The Impact Extractor Set with Left Hand Drill Bits is designed specifically for the challenging task of drilling out damaged or stripped bolts. This comprehensive 14-piece set combines robust bolt and nut removers with precision left-hand drill bits and spiral screw extractors. Made from high-quality 35# Cr-Mo and HSS steel, it ensures durability and impact resistance for tough jobs.
Key Features That Stand Out
- ✓ Comprehensive 14-piece set including SAE/Metric bolt removers.
- ✓ Includes 6 Cr-Mo spiral screw extractors and 6 HSS left-hand drill bits.
- ✓ Constructed from high-strength 35# Cr-Mo and HSS steel for durability.
- ✓ Heat-treated for enhanced strength and impact resistance.
- ✓ Designed to easily remove rusted, damaged, or stripped bolts.
Why We Recommend It
We recommend this set for its all-encompassing approach to bolt extraction. The combination of left-hand drill bits and spiral extractors provides multiple methods for tackling different types of damage, making it a versatile and reliable choice for both professionals and DIY enthusiasts. Its heavy-duty construction means it can withstand the rigor of difficult extraction tasks.
Best For
This set is ideal for mechanics, tradespeople, and serious DIYers who frequently encounter damaged or stubborn bolts and require a robust, all-in-one solution for extraction.
Pros and Cons
Pros:
- Wide range of sizes for various bolt types (SAE/Metric).
- High-quality steel construction ensures long-lasting performance.
- Left-hand drill bits are effective at backing out bolts.
- Impact-resistant design handles tough applications.
Cons:
- May require some technique to master for beginners.
- Storage case could be more robust for heavy-duty use.
Customer Reviews
Customer Review: Works as expected. I was stuck on a screw that was in bad state and I need to extract. This worked for the job.
Customer Review: Works as expected. I was stuck on a screw that was in bad state and I need to extract. This worked for the job.Read more
2. COMOWARE HSS Multi-Purpose Drill and Screwdriver Bit Set for Drilling Out Bolts and Fasteners
The COMOWARE HSS Multi-Purpose Drill and Screwdriver Bit Set is an incredibly versatile 200-piece collection, perfect for a wide array of tasks beyond just drilling out bolts, yet it includes crucial components for such operations. Featuring premium High-Speed Steel (HSS) drill bits and Chrome Vanadium (Cr-V) screwdriver bits, this set offers both durability and precision. It comes in a professional-grade organized case, making it easy to find the right bit for any job.
Key Features That Stand Out
- ✓ Extensive 200-piece set covers a broad range of drilling and driving needs.
- ✓ Includes 23 HSS twist drills ideal for penetrating various materials.
- ✓ Premium HSS and Cr-V construction ensures sharpness and resistance to wear.
- ✓ Impact-resistant transparent case with custom foam for excellent organization.
- ✓ Color-coded slots facilitate quick identification of bit types and sizes.
Why We Recommend It
While not exclusively for bolt extraction, this COMOWARE set earns our Editor’s Choice for its sheer versatility and the inclusion of high-quality HSS drill bits that are essential for starting pilot holes in broken bolts. Its comprehensive nature means you’ll likely have the right size and type of bit for preparation before using an extractor, or even for direct drilling through smaller bolts. The organization system is a significant bonus for efficient workflow.
Best For
This set is excellent for DIY enthusiasts, homeowners, and general contractors who need a highly versatile and well-organized collection of drill and driver bits for everyday tasks, including the preparatory drilling for bolt extraction.
Pros and Cons
Pros:
- Exceptional value due to the large number of bits.
- High-quality materials (HSS, Cr-V) for durability.
- Superb organization system keeps bits tidy and accessible.
- Suitable for a wide variety of materials and applications.
Cons:
- Doesn’t include dedicated extractors; primarily drill/driver bits.
- Some users might find such a large set overwhelming for specific tasks.
Customer Reviews
Customer Review: Super useful set of drill bits, they were cheaper than any of the bid box stores and the quality seems good. Plenty of different sizes for different jobs.
Customer Review: Super useful set of drill bits, they were cheaper than any of the bid box stores and the quality seems good. Plenty of different sizes for different jobs.Read more
3. Damaged Screw Extractor Drill Bit Set for Removing Broken Rusty Stripped Bolts and Nuts
The Damaged Screw Extractor Drill Bit Set by CLEVEROOL offers an accessible and effective solution for removing broken, rusty, or stripped bolts and nuts without breaking the bank. This 13-piece set includes a complete range of spiral screw extractors, featuring a titanium gold-plated surface for enhanced durability and corrosion resistance. Its user-friendly design makes challenging extractions more manageable for various applications.
Key Features That Stand Out
- ✓ Comprehensive 13-piece set for diverse extraction challenges.
- ✓ Features 7 spiral screw extractors (ranging from #1 to #7).
- ✓ Titanium Gold-Plated surface for improved durability and corrosion resistance.
- ✓ Designed for easy removal of damaged screws and bolts.
- ✓ Versatile applications for workshop, home, and automotive repairs.
Why We Recommend It
We’ve selected this set as our Best Budget option because it provides crucial tools for bolt extraction at an excellent price point. The titanium gold-plated surface is a notable feature for its price, offering better longevity compared to standard extractors. While some users report issues with material strength, for occasional use on moderately seized bolts, this set offers considerable value.
Best For
This set is best for occasional users, DIYers, or hobbyists who need a reliable set of screw extractors for light to medium-duty tasks without a significant investment.
Pros and Cons
Pros:
- Affordable price makes it accessible for most budgets.
- Titanium Gold-Plated for better corrosion resistance.
- Comprehensive range of extractor sizes for versatility.
- User-friendly design for straightforward operation.
Cons:
- Some reports of durability issues with very stubborn or hardened bolts.
- May not be suitable for heavy-duty, industrial applications.
Customer Reviews
Customer Review: One of the worst return ever I had to buy a bag for $3.00 at UPS. I don’t understand why cannot do it like kohls hassle free just accepted and be done with it.The product was made from cheap material. It broke off now I’m having the worst time trying to pull the broken piece out.
Customer Review: One of the worst return ever I had to buy a bag for $3.00 at UPS. I don’t understand why cannot do it like kohls hassle free just accepted and be done with it.The product was made from cheap material. It broke off now I’m having the worst time trying to pull the broken piece out.Read more
4. Triple Spiral Flute Cobalt Drill Bit Set for Drilling Out Bolts in Hardened Metals
When dealing with bolts embedded in particularly tough or hardened metals, standard drill bits often fall short. The Triple Spiral Flute Cobalt Drill Bit Set is specifically engineered for these demanding applications. Its unique three-flute spiral design combined with a Titanium Aluminum Nitride (TiAlN) coating delivers superior cutting performance, heat resistance, and chip removal, making it an excellent choice for drilling out stubborn fasteners in difficult materials.
Key Features That Stand Out
- ✓ Unique triple-flute spiral design for higher roundness and smoother holes.
- ✓ Superior chip removal capabilities prevent clogging and overheating.
- ✓ 5-piece 1/2″ cobalt drill bit set, ideal for larger and tougher bolts.
- ✓ Titanium Aluminum Nitride (TiAlN) coating increases surface hardness to 89HRC.
- ✓ Outstanding heat resistance ensures prolonged sharpness and faster cutting in hardened metals.
Why We Recommend It
This cobalt drill bit set is highly recommended for its specialized design and material composition, making it perfectly suited for drilling into hardened steel or tough alloys where other bits would fail. The triple-flute design and TiAlN coating drastically improve efficiency and bit longevity, proving invaluable when needing to precisely bore out a broken bolt without damaging surrounding material.
Best For
This set is an absolute must-have for professionals and serious DIYers working with high-strength steel, stainless steel, cast iron, or other hardened metals where precision and durability are paramount for bolt extraction.
Pros and Cons
Pros:
- Exceptional performance in drilling hardened metals.
- Triple-flute design improves cutting speed and hole quality.
- TiAlN coating extends bit life and enhances heat resistance.
- Comes with a convenient index storage case.
Cons:
- Higher price point than general-purpose drill bit sets.
- Limited to 1/2″ size, so not suitable for all bolt diameters.
Customer Reviews
Customer Review: They work good I’m really happy with it cut through like butter
Customer Review: I really like the fact that these bits have a triple flute instead on a double flute. I only tried one bit but it seems very sharp. I am not sure what ‘Alruminum’ is on the packaging 😉 .I don’t know if these bits can be easily sharpened and only time will tell how if they’re durable for long term
5. NEIKO HSS M2 Steel Left-Hand Drill Bit and Extractor Set for Stripped Screws and Broken Bolts
The NEIKO HSS M2 Steel Left-Hand Drill Bit and Extractor Set is a purpose-built kit for confronting stripped screws and broken bolts head-on. Crafted from cobalt-fortified M2 High-Speed Steel, these left-handed drill bits offer superior durability and are designed to effectively grip and reverse out damaged fasteners. The specialized spiral flutes enhance extraction by increasing grip as torque is applied, making it a reliable choice for challenging removals.
Key Features That Stand Out
- ✓ Dedicated set for removing broken screws, studs, and bolts.
- ✓ Left-hand drill bits made from cobalt-fortified HSS M2 steel for durability.
- ✓ Reversed drill bit action helps back out seized fasteners.
- ✓ Spiral flutes provide increased grip and torque for effective extraction.
- ✓ High-quality materials ensure extended service life for repeated use.
Why We Recommend It
NEIKO’s set stands out for its specific focus on extraction with high-quality, left-handed bits. The cobalt-fortified M2 HSS steel offers excellent hardness and wear resistance, crucial when drilling into tough, broken bolts. This set simplifies the process by combining drilling and extraction into a single, reverse-action step, often allowing the bolt to unthread itself as you drill.
Best For
This set is ideal for automotive technicians, maintenance professionals, and individuals who frequently encounter stripped or broken fasteners and need a reliable, efficient tool for their removal.
Pros and Cons
Pros:
- Excellent durability due to cobalt-fortified HSS M2 steel.
- Left-hand design often removes bolts without needing a separate extractor.
- Spiral flutes provide superior grip for extraction.
- Reputable brand known for quality tools.
Cons:
- Requires careful centering to prevent further damage to the bolt.
- Smaller bits can be prone to breakage if excessive force is applied.
Customer Reviews
Customer Review: Once again NEIKO nailed it. I have bought a few of their bit sets and they were great, so I wanted to try these and I am not disappointed. Holding together great and doing their job. I hope to get more of NEIKO’s products soon.
Customer Review: Bolt that holds fairings on broke off into frame. Firstly used automatic punch to start drill hole. Used this left hand drill bit set on reverse, lubed it bit. Used smallest and next size smallest bit. Did not break. I did have trouble getting the smallest drill bit out of the slot in the case, easy
Complete Buying Guide for Best Drill Bits For Drilling Out Bolts
Choosing the right drill bits for extracting a damaged bolt can make all the difference between a quick fix and a frustrating ordeal. To help you make an informed decision, here’s a comprehensive guide covering the essential factors to consider.
Essential Factors We Consider
When selecting drill bits for drilling out bolts, several critical features come into play:
- Material Strength: Look for bits made from High-Speed Steel (HSS), cobalt (HSS-Co), or titanium-nitride (TiN) coated HSS. Cobalt drill bits are particularly effective for hardened materials, offering superior heat and abrasion resistance. HSS is suitable for softer metals, while TiN coatings enhance durability and reduce friction.
- Left-Handed Design: For bolt extraction, left-hand drill bits are often preferred. As they drill counter-clockwise, there’s a chance they might catch on the bolt and unscrew it without the need for a separate extractor. This can save time and effort.
- Extractor Type: Many sets include both drill bits and spiral screw extractors. Spiral extractors (often called “Easy Outs”) are tapered and have aggressive left-hand threads that bite into a pre-drilled pilot hole in the broken bolt, allowing you to twist it out.
- Size Range: Ensure the set includes a variety of sizes suitable for the bolts you typically encounter. Having a range for both drilling pilot holes and matching extractor sizes is crucial.
- Flute Design: The flutes (grooves) on a drill bit help remove chips. A good flute design ensures efficient chip evacuation, preventing overheating and binding, especially important when drilling into metal. Some specialized bits, like triple spiral flutes, offer enhanced chip removal and stability.
- Coating: Coatings like Titanium Aluminum Nitride (TiAlN) or Titanium Nitride (TiN) increase the bit’s surface hardness, reduce friction, and improve heat resistance, leading to longer bit life and faster drilling.
- Shank Type: Most bits will have a round shank, but some may feature hexagonal shanks for better grip in drill chucks or impact drivers.
- Set vs. Individual: While buying individual bits might seem cheaper for a single project, investing in a quality set provides versatility for future needs and often offers better value.
Budget Planning
The cost of drill bits for drilling out bolts can vary significantly based on material, brand, and the number of pieces in a set. Budget-friendly options typically feature standard HSS construction and fewer bits, suitable for occasional use on less stubborn bolts. Mid-range sets often include cobalt or titanium-coated HSS bits with a broader range of sizes and possibly both left-hand drills and extractors, offering a good balance of performance and value. High-end sets, featuring premium cobalt or specialized coatings and extensive size ranges, are a worthwhile investment for professionals who frequently tackle tough extraction jobs, as their durability and efficiency will pay off over time. Consider your usage frequency and the types of materials you’ll be working with to determine the best investment for your needs.
Final Thoughts
Successfully drilling out a broken or stripped bolt requires patience, the correct technique, and, most importantly, the right tools. By prioritizing drill bits made from durable materials like cobalt or high-quality HSS with appropriate coatings, and considering specialized features like left-hand drilling action and spiral extractors, you equip yourself for success. Always match the bit size to the bolt’s diameter for optimal results and remember that investing in a quality set will serve you well for many challenging projects to come.
Frequently Asked Questions
Q: What type of drill bit is best for drilling out stripped bolts?
A: For stripped bolts, a combination of left-hand drill bits and spiral screw extractors is typically the most effective. The left-hand drill bit drills counter-clockwise, often loosening the bolt as it cuts. If it doesn’t, it creates a pilot hole for a spiral extractor, which then bites into the bolt and allows you to twist it out.
Q: How do left-hand drill bits work for bolt extraction?
A: Left-hand drill bits have their cutting edges and flutes oriented to cut when rotating counter-clockwise, the opposite direction of a standard drill bit. When used with a drill set to reverse, they will cut into the bolt while simultaneously attempting to unscrew it. This can often remove a broken bolt without needing a separate extractor.
Q: Can I use a regular drill bit to remove a broken bolt?
A: While you can use a regular (right-hand) drill bit to create a pilot hole in a broken bolt, it will not aid in unscrewing the bolt. In fact, drilling deeper with a right-hand bit might inadvertently tighten the broken bolt. For actual extraction, you’ll still need a left-hand drill bit or a screw extractor after drilling the pilot hole.
Q: What size drill bit should I use for a stripped bolt?
A: The drill bit size depends on the diameter of the stripped bolt. For extractors, you usually select a drill bit that is slightly smaller than the bolt’s core diameter, allowing the extractor to get a good grip without damaging the surrounding threads. Most extractor sets come with recommended drill bit sizes for each extractor. Always start with a smaller bit and increase if necessary.
Q: What safety precautions should I take when drilling out bolts?
A: Always wear appropriate personal protective equipment (PPE), including safety glasses and gloves. Ensure your workpiece is securely clamped to prevent movement. Use a center punch to create a divot before drilling to prevent the bit from wandering. Start drilling slowly and apply steady, even pressure, using cutting oil or lubricant to reduce heat and friction, which prolongs bit life and improves cutting efficiency. Be cautious with extractors, as they can break if overtightened, creating a much harder problem to solve.
Conquering a stripped or broken bolt can be a daunting task, but with the right tools, it becomes a manageable challenge. The best drill bits for drilling out bolts are those that combine durability, precision, and specialized design to grip and extract stubborn fasteners effectively. Whether you opt for a comprehensive left-hand drill and extractor set, a versatile multi-purpose kit, or specialized cobalt bits for hardened materials, investing in quality tools will save you time, frustration, and potential damage to your projects. Don’t let a seized bolt halt your progress – equip yourself with the best and get the job done right. Check out our top recommendations on Amazon today and add these essential tools to your workshop!
I’m Darrell Julian, the founder, lead writer, and hands-on welding enthusiast behind ArcWeldingPro.com. With more than 15 years of real-world welding experience, I created this platform to share what I’ve learned in the field, in the shop, and in the heat of the arc.
