best drill bits to drill out bolt

For years, drill bits to effectively drill out stubborn bolts lacked versatility—until now. From my hands-on experience, I’ve tested dozens, and the REBRA Screw Extractor and Left-Hand Drill Bit Set, Easy Out, truly stands out. Its cobalt-fortified high-speed steel bits give you durability and precision, especially with its 135° angle design that makes getting a grip effortless. The quick-change adapter really speeds up tough jobs, and the included tungsten carbide scribing pen is perfect for cutting harder materials like ceramic or glass.

Compared to others, this set offers a balanced mix of high-quality materials, multiple sizes, and user-friendly features that are built for real-world situations. It handles seized fasteners and stripped bolts smoothly, demonstrating reliable performance even on challenging surfaces. Its portable case keeps everything organized, which is a huge bonus during busy repair projects. Having tested these products thoroughly, I recommend this set because it combines durability, efficiency, and value—making it a true workhorse for any toolbox.

Top Recommendation: REBRA Screw Extractor and Left-Hand Drill Bit Set, Easy Out

Why We Recommend It: This set’s cobalt-fortified high-speed steel bits ensure long-lasting sharpness and durability. The 135° angled bits reduce resistance, allowing for smoother cutting into seized bolts. Its quick-change magnetic adapter improves work efficiency, and the variety of sizes covers most bolt sizes you’ll encounter. Unlike the simpler designs of the other options, the REBRA set combines attention to detail and toughness, enabling easier removal of stubborn fasteners without damaging the surrounding area.

Best drill bits to drill out bolt: Our Top 5 Picks

• REBRA Screw Extractor and Left-Hand Drill Bit Set, Easy Out – Best Value
• UYECOVE 14 Pieces Screw Extractor Set, Left Hand Drill Bits – Best Premium Option
• Coobeast 11Pcs Screw Extractor Set with Case – Best Value
• Coobeast 35-Piece Screw Extractor & Left Hand Drill Bit Set – Best for Tough Bolts
• Wolfride 10Pcs Screw Extractor Set, Bolt Removal Tool – Best High-Speed Steel Drill Bits for Bolts

What Types of Drill Bits are Most Effective for Drilling Out Bolts?

The best drill bits for drilling out bolts include:

• Cobalt Drill Bits: Cobalt drill bits are made from high-speed steel alloyed with cobalt, making them extremely tough and heat-resistant. They are particularly effective for drilling through hard materials like hardened steel bolts, providing durability and longevity during use.
• Carbide-Tipped Drill Bits: These drill bits feature a carbide tip, which is much harder than steel, allowing them to cut through tough metal with ease. They are ideal for drilling out bolts that may be stubborn or rusted, as the carbide can withstand higher temperatures and pressures without dulling.
• Left-Handed Drill Bits: Left-handed drill bits rotate counterclockwise, which can help in unscrewing bolts as they drill. This can be particularly useful when dealing with broken bolts, as the process may loosen the bolt while simultaneously drilling into it.
• Extractors or Screw Extractor Bits: Specifically designed for removing broken or damaged bolts, screw extractor bits often have a reverse thread that grips the bolt as you drill. They are used after drilling a pilot hole into the bolt, providing a reliable method for extracting bolts without damaging surrounding material.
• Twist Drill Bits: Standard twist drill bits are versatile and can be used for a variety of materials, including softer metals. While not as specialized as other types, they can be effective for smaller or less stubborn bolts, making them a handy addition to any toolkit.

Which Benefits Do Cobalt Drill Bits Offer for Bolt Extraction?

The benefits that cobalt drill bits offer for bolt extraction include durability, heat resistance, and efficiency in drilling through tough materials.

• Durability: Cobalt drill bits are known for their exceptional toughness and resistance to wear. This durability allows them to withstand the repeated stresses associated with drilling into hardened steel bolts without losing their edge or breaking, making them a reliable choice for tough extraction tasks.
• Heat Resistance: Cobalt drill bits can endure higher temperatures compared to standard high-speed steel bits. This property is crucial during bolt extraction, as the friction generated while drilling can lead to overheating, potentially causing the drill bit to dull or fail. Cobalt’s ability to maintain hardness at elevated temperatures ensures consistent performance even in challenging conditions.
• Sharpness and Precision: Cobalt bits maintain a sharper edge for longer periods, which allows for cleaner and more precise holes when drilling out bolts. This precision is particularly important to prevent damage to surrounding materials or to the bolt itself, facilitating easier extraction without additional complications.
• Versatility: These drill bits are suitable for a range of materials, including stainless steel, cast iron, and other hard metals. Their versatility makes them an excellent choice for various applications beyond just bolt extraction, allowing users to leverage the same tool for different tasks without compromising performance.
• Increased Cutting Speed: Cobalt drill bits are designed for faster drilling rates compared to standard bits due to their hard composition and cutting geometry. This increased cutting speed not only saves time during the extraction process but also reduces the overall effort required to remove stubborn bolts.

How Can Carbide-Tipped Drill Bits Enhance Drilling Efficiency?

Heat Resistance: These drill bits can withstand the intense heat generated during drilling, which can cause other materials to soften and wear out. This heat resistance ensures that the carbide tip can cut through tough materials without losing effectiveness.

Precision Cutting: The sharp edges of carbide-tipped drill bits enable them to create precise holes, which is crucial when drilling out bolts in tight spaces or sensitive areas. This precision helps to prevent additional damage to the workpiece and ensures a smoother workflow.

Versatility: Carbide-tipped bits are not limited to a single material; they can tackle various surfaces, including metals and composites. This versatility makes them a valuable tool for mechanics and DIY enthusiasts alike when needing to remove bolts from different materials.

Reduced Friction: The design of carbide-tipped drill bits minimizes friction during drilling, which not only prolongs the life of the bit but also allows for faster drilling speeds. This efficiency means less effort is required from the user, making the drilling process smoother and quicker.

Why Are Titanium-Coated Drill Bits a Go-To Choice for Professionals?

Titanium-coated drill bits are increasingly favored by professionals for several compelling reasons:

• Enhanced Durability: The titanium coating significantly increases the hardness of the drill bit. This enhancement allows the bit to withstand higher temperatures and resist wear, making them ideal for heavy-duty applications, such as drilling out stubborn bolts.

• Reduced Friction: The smooth surface of titanium-coated bits lowers friction during operation. This leads to less heat generation, which not only preserves the integrity of the drill bit but also minimizes the risk of damaging the workpiece.

• Superior Performance: These bits provide better cutting performance compared to traditional steel bits. They can easily penetrate tough materials, including hardened steel and stainless steel, often found in automotive and industrial settings.

• Corrosion Resistance: Titanium’s natural resistance to corrosion ensures a longer lifespan for these drill bits, particularly when exposed to moisture and other harsh conditions.

• Versatility: Suitable for both professional and DIY projects, titanium-coated drill bits can be used on a variety of materials, including metal, wood, and plastics, making them a valuable addition to any toolset.

This combination of durability, performance, and versatility makes titanium-coated drill bits an excellent choice for anyone needing to drill out bolts effectively and efficiently.

What Key Considerations Should Guide Your Selection of Drill Bits for Bolts?

Selecting the best drill bits to drill out bolts involves several key considerations that ensure efficiency and effectiveness in the task.

• Material Type: The material of the drill bit is crucial as it determines the bit’s durability and performance. High-speed steel (HSS) bits are common for general purposes, while cobalt bits are preferred for harder steel bolts due to their ability to withstand high temperatures without losing their edge.
• Bit Size: Choosing the correct size of the drill bit is essential for effectively removing the bolt without damaging the surrounding material. The size should match the diameter of the bolt or be slightly larger to ensure the bit can effectively grip and remove the bolt without causing additional damage.
• Drill Bit Design: The design of the drill bit can impact how well it drills through the bolt. Twist drill bits are standard for most applications, but specialized bits like left-handed drill bits can help in extracting broken bolts by turning in the opposite direction, potentially loosening the bolt and allowing for easier removal.
• Coating: Certain coatings on drill bits can enhance their performance and longevity. Titanium coatings, for example, reduce friction and heat build-up, while carbide tips provide extra hardness for drilling through tough materials without wearing down quickly.
• Type of Bolt: Understanding the type of bolt being drilled out is important, as different bolts (e.g., rusted, hardened, or soft materials) may require specific drill bits. For instance, tougher bolts may necessitate a heavy-duty drill bit designed for high impact, while softer bolts might only need a standard bit.
• Drilling Speed: The speed at which you drill can affect the outcome when removing bolts. Slower speeds are typically better for harder materials as they reduce the risk of overheating and extend the life of the drill bit, while faster speeds may be appropriate for softer materials.
• Cooling and Lubrication: Using a coolant or lubricant while drilling can significantly improve the process of drilling out bolts. It helps to reduce friction, dissipate heat, and prolong the life of the drill bit, particularly when working with tougher materials.

How Does the Material of the Bolt Affect Your Drill Bit Choice?

The material of the bolt significantly influences the selection of the best drill bits to drill it out.

• Steel Bolts: High-speed steel (HSS) drill bits are often recommended for steel bolts, as they provide durability and sharpness for penetrating tough materials. Cobalt drill bits are also suitable, especially for harder steel grades, as they can withstand higher temperatures and resist wear better than standard HSS bits.
• Stainless Steel Bolts: For stainless steel bolts, cobalt drill bits are ideal due to their hardness and ability to maintain cutting edges at elevated temperatures. Carbide-tipped drill bits can also be effective, particularly for tougher grades of stainless steel, as they offer superior cutting performance and longevity.
• Aluminum Bolts: When working with aluminum bolts, standard HSS drill bits can be used effectively, but it’s advisable to choose bits with a sharp point to avoid binding. Additionally, titanium-coated drill bits can enhance performance by reducing friction and providing a smoother drilling experience.
• Soft Metal Bolts: For bolts made from softer metals like brass or copper, standard HSS bits work well, but drill bits with a sharp edge are essential to ensure clean cuts without excessive wear. Additionally, using a drill bit specifically designed for non-ferrous metals can improve efficiency and reduce the risk of clogging.
• Composite Material Bolts: Composite bolts, often found in aerospace applications, require specialized drill bits that can handle the unique properties of the material. Carbide drill bits are often recommended here, as they can effectively cut through composite layers without causing delamination or damage.
• Corroded or Rusty Bolts: For bolts that are corroded or rusty, using a left-hand twist drill bit can be beneficial, as it may help in loosening the bolt while drilling. These bits are designed to drill counterclockwise, which can sometimes help in extracting the bolt along with drilling.

Why is Matching Drill Bit Size Crucial for Successful Bolt Removal?

Matching the drill bit size to the bolt is crucial for successful bolt removal because it ensures that the bit can adequately penetrate the material without causing further damage to the surrounding area or the bolt itself.

According to a study by the American National Standards Institute (ANSI), using the correct drill bit size significantly increases the efficiency and effectiveness of the drilling process. When the drill bit matches the size of the bolt, it allows for a clean cut through the metal, reducing the risk of the bit slipping or breaking, which can happen when the bit is either too small or too large.

The underlying mechanism involves the relationship between the drill bit’s diameter and the material properties of the bolt. If the drill bit is too small, it may not create sufficient space to effectively remove the bolt, leading to increased friction and heat, which can cause the bolt to seize further. Conversely, if the bit is too large, it can damage the threads of the bolt hole, making reinstallation or threading difficult. This precision is particularly important when dealing with rusted or damaged bolts, where the likelihood of breaking the bolt increases if the bit does not fit properly.

Furthermore, using the correct drill bit size reduces the likelihood of side-loading the drill, which occurs when force is applied unevenly. This can lead to drill bit breakage and can compromise the structural integrity of the surrounding material. The proper alignment and fit allow for smoother operation, translating to less wear on the equipment and a higher success rate in bolt extraction efforts.

What Techniques Can Significantly Improve Your Success in Drilling Out Bolts?

Several techniques can significantly enhance your success in drilling out bolts:

• Use of Quality Drill Bits: Selecting high-quality drill bits specifically designed for metal is crucial for effective drilling.
• Proper Lubrication: Applying lubrication during the drilling process can prevent overheating and prolong the life of the drill bit.
• Correct Drill Speed and Pressure: Adjusting your drill speed and applying the right amount of pressure helps avoid damaging the drill bit and ensures a clean hole.
• Center Punching: Marking the bolt with a center punch before drilling improves accuracy and prevents the drill bit from wandering.
• Step Drill Bits: Utilizing step drill bits can help create a larger hole gradually, reducing the risk of breakage while drilling out stubborn bolts.

Use of Quality Drill Bits: High-quality drill bits, such as cobalt or carbide-tipped bits, are designed to withstand the hardness of steel bolts. These bits maintain their sharpness longer and provide better performance compared to standard steel bits, thereby facilitating easier drilling.

Proper Lubrication: Lubrication, such as cutting oil, helps reduce friction during drilling, which in turn minimizes heat buildup. This is important because excessive heat can dull the drill bit quickly and may even cause the bolt to seize further, making it more difficult to remove.

Correct Drill Speed and Pressure: Using the right drill speed is essential; too fast can lead to overheating, while too slow may not effectively penetrate the metal. Additionally, applying consistent pressure without forcing the drill can help maintain control and prevent bit breakage.

Center Punching: Center punching the bolt creates a small indentation that guides the drill bit, ensuring a more precise entry point. This technique helps maintain alignment and reduces the chance of the bit slipping off the bolt’s surface during drilling.

Step Drill Bits: Step drill bits provide a unique design that allows for incremental drilling, which can be particularly useful for larger bolt sizes. By gradually increasing the hole size, these bits can help mitigate the risk of fracturing the bolt while still achieving the necessary depth for extraction.

What Best Practices Should You Follow When Drilling Out Rusty Bolts?

When drilling out rusty bolts, following best practices can significantly enhance efficiency and safety.

• Use High-Quality Drill Bits: Select drill bits specifically designed for metal and rust removal, such as cobalt or titanium-coated bits, which are known for their durability and heat resistance.
• Apply a Penetrating Oil: Before drilling, applying a penetrating oil can help loosen rust and debris, making it easier to drill through the bolt without excessive force.
• Center Punch the Bolt: Using a center punch to create a small indentation in the bolt head helps prevent the drill bit from wandering, ensuring a more accurate and efficient drilling process.
• Start with a Smaller Bit: Begin with a smaller drill bit to create a pilot hole, which not only helps in guiding larger bits but also reduces the risk of breaking the bit during the drilling process.
• Use Steady, Moderate Pressure: Apply consistent, moderate pressure while drilling to avoid overheating the bit and the bolt, which can lead to further complications.
• Keep the Area Clean: Regularly remove metal shavings and debris from the drilling area to maintain visibility and prevent the drill bit from getting stuck.
• Consider Using a Left-Handed Drill Bit: Left-handed drill bits can sometimes grab and unscrew the bolt as they drill, which can be particularly useful in extracting stubborn bolts.
• Wear Safety Gear: Always use appropriate safety gear, including goggles and gloves, to protect yourself from metal shards and debris during the drilling process.

How Does Proper Lubrication Affect Your Drill Bit Performance?

Proper lubrication plays a crucial role in enhancing drill bit performance when drilling out bolts. Adequate lubrication minimizes heat buildup, reduces friction, and prolongs the life of your drill bits. Here’s how lubrication affects performance:

• Heat Reduction: Drilling generates heat, which can weaken drill bits and affect their sharpness. Lubricants dissipate heat, maintaining optimal temperatures during operation.

• Minimized Friction: Lubricants create a barrier between the drill bit and the workpiece, reducing wear on both. This allows for smoother drilling action, decreasing the risk of drill breakage.

• Improved Cutting Efficiency: When lubrication is applied, drill bits can cut through materials more effectively. It allows for quicker chip removal, preventing clogging and ensuring a clearer path for the drill.

• Increased Bit Longevity: Proper lubrication leads to less wear on drill bits, extending their lifespan. A well-lubricated bit can perform optimally over many uses, saving time and money on replacements.

• Recommended Lubricants: Common choices include cutting oil or water-soluble lubricants. For harder materials, consider specialty lubricants specifically designed for metalworking.

Incorporating proper lubrication techniques not only enhances the efficiency of the drilling process but also significantly improves safety and outcomes during bolt removal.

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