When tackling projects that involve drilling through metal, having the right tools is paramount. Standard drill bits often falter against tougher materials like stainless steel, cast iron, or hardened alloys, leading to frustration and damaged equipment. That’s why investing in high-quality metal cutting drill bits designed for such challenges is crucial for both professionals and DIY enthusiasts. Our comprehensive guide helps you navigate the options to find the perfect set that offers precision, durability, and efficiency for all your demanding metalworking tasks.
Quick Product Comparison
Our Top 5 Best Metal Cutting Drill Bits Reviews – Expert Tested & Recommended
1. 1/2″ Solid Tungsten Carbide Drill Bit for Cutting Stainless, Hardened Steel, Cast Iron, Alloy, Copper
The HOYUSK 1/2″ Solid Tungsten Carbide Drill Bit is engineered for extreme durability and precision, making it our top recommendation for challenging metal drilling tasks. Crafted from micro-particle cemented carbide, it offers unmatched wear resistance and strength. This single drill bit excels in cutting through the toughest materials where other bits simply fail.
Key Features That Stand Out
- ✓ Tungsten Carbide Material: Made from 0.6um micro-particle cemented carbide for superior hardness and wear resistance.
- ✓ Sharp Spiral Flutes: Designed to provide neat, smooth cuts with high cutting edge strength and fast chip evacuation.
- ✓ Exceptional Durability: Offers outstanding longevity and reliability even under demanding conditions.
- ✓ Versatile Application: Ideal for stainless steel, hardened steel, cast iron, alloy, and copper.
Why We Recommend It
This drill bit stands out for its ability to cut through materials that typically challenge other high-performance bits. Its solid tungsten carbide construction means it retains its sharpness and integrity much longer, providing a precise and efficient drilling experience. If you frequently work with very hard metals, this bit will be an invaluable addition to your toolkit.
Best For
Professionals and serious DIYers who regularly drill through hardened metals, stainless steel, or other extremely tough alloys where conventional cobalt or HSS bits struggle.
Pros and Cons
Pros:
- Unrivaled ability to drill through extremely hard metals.
- Superior wear resistance and strength due to solid tungsten carbide.
- Produces clean and smooth holes consistently.
- Longer lifespan compared to other drill bit materials.
Cons:
- Higher price point for a single bit.
- More brittle than cobalt, requiring careful handling to prevent chipping.
Customer Reviews
Customer Review: “I rarely write reviews but this one is worth it. I needed to drill 2 holes in my steel motorcycle kickstand to install risers. I tried cobalt bits from Milwaukee and Dewalt. Both claimed to drill through hard metal easily. They didn’t even make a dent. Returned them. This bit worked perfectly.”
Customer Review: “Absolutely impressed with the durability. I was able to drill through some very tough steel plate without any signs of dulling. A must-have for serious metalwork.”
2. Cobalt Drill Bit Set for Hardened Metal, Stainless Steel, Cast Iron, Wood, Plastic
This Cobalt Drill Bit Set is an excellent all-rounder for anyone frequently working with various materials, including challenging metals. Made from M35 Cobalt 5% High-Speed Steel, these bits offer superior heat resistance and increased hardness compared to standard HSS bits. Their robust construction and efficient design make them a reliable choice for a wide range of drilling tasks.
Key Features That Stand Out
- ✓ M35 Cobalt Material: Composed of High Speed Steel with 5% Cobalt for enhanced heat resistance and durability.
- ✓ 135° Split Point Design: Prevents “walking” and allows for precise, clean drilling starts without a pilot hole.
- ✓ Fully Ground Twist Design: Facilitates faster chip removal, reduces friction and heat, leading to cooler and more efficient drilling.
- ✓ Multi-Material Compatibility: Effective on hardened metal, stainless steel, cast iron, wood, and plastic.
Why We Recommend It
As our Editor’s Choice, this set provides an outstanding balance of performance and versatility. The M35 cobalt composition ensures these bits can withstand the rigors of drilling through tough metals, while the split point design guarantees accurate starts. It’s a dependable choice for diverse projects requiring durable and precise drill bits.
Best For
Users who need a versatile and robust drill bit set capable of handling a variety of materials, from wood and plastic to hardened metals and stainless steel.
Pros and Cons
Pros:
- Excellent heat resistance and hardness for demanding applications.
- 135° split point ensures accurate starting and prevents bit wandering.
- Efficient chip removal reduces heat buildup and improves bit life.
- Versatile for a wide range of materials beyond just metal.
Cons:
- May not be as durable as solid carbide for extremely hard, continuous use.
- Some users reported slightly less durability compared to premium cobalt brands.
Customer Reviews
Customer Review: “Great value. Used a bit to drill a starter hole in a 1/8th inch thick metal frame and it worked well.”
Customer Review: “Work well, could be slightly more durable but for price not a bad value.”
3. 29-Piece M35 Cobalt Drill Bit Set for Metal Cutting, 1/16-1/2″, 135° Point Angle
For those seeking a comprehensive and reliable set of metal cutting drill bits without breaking the bank, this 29-piece M35 Cobalt Drill Bit Set is an outstanding choice. Covering a wide range of sizes from 1/16″ to 1/2″, these heavy-duty bits are designed for rigorous metalwork, offering both value and performance with their 135° split point angle.
Key Features That Stand Out
- ✓ Heavy-Duty M35 Cobalt: Constructed from M35 cobalt alloy for enhanced hardness and heat resistance.
- ✓ Extensive Size Range: A complete 29-piece set from 1/16″ to 1/2″ in fractional sizes, suitable for various tasks.
- ✓ 135° Split Point Angle: Provides self-centering capabilities, reducing walking and making precise starts.
- ✓ Jobber Drill Style: Standard length and flute design ideal for general-purpose drilling in metal.
Why We Recommend It
This set earns our ‘Best Budget’ recommendation because it delivers exceptional performance typically found in higher-priced sets, at a more accessible cost. The M35 cobalt composition ensures these bits can handle tough metals, and the wide size range makes it a versatile addition to any workshop. It’s perfect for those who need a full set without compromising on quality.
Best For
DIYers and contractors who need a comprehensive and durable set of cobalt drill bits for general metal fabrication and repair work on a budget.
Pros and Cons
Pros:
- Excellent value for a complete 29-piece M35 cobalt set.
- Effective for cutting various metals, including stainless steel.
- 135° split point ensures easy and accurate starts.
- Comes in a sturdy case for organization and protection.
Cons:
- Individual bits may not withstand continuous extreme industrial use as well as premium alternatives.
- The case might not be as robust as those from higher-end brands.
Customer Reviews
Customer Review: “I was hesitant due to the price but these cobalt bits have exceeded my expectations. They cut through steel studs like butter. Great for my renovation projects.”
Customer Review: “For the amount of bits you get and the quality, this set is hard to beat. I’ve used them on several automotive repairs and they hold up surprisingly well.”
4. Premium Cobalt Drill Bit Set for Cutting Hardened Metals, Stainless Steel, Cast Iron
This Premium Cobalt Drill Bit Set offers a comprehensive selection of sizes for those who demand high performance when cutting through demanding materials. Featuring M35 Cobalt construction, these bits are specifically engineered to tackle hardened metals, stainless steel, and cast iron with precision and durability. The set provides a quick and efficient solution for various drilling needs.
Key Features That Stand Out
- ✓ M35 Cobalt Steel: Made with 5% cobalt for superior abrasion resistance and heat durability, crucial for hard metals.
- ✓ Wide Range of Sizes: Includes 29 common fractional sizes from 1/16″ to 1/2″ for diverse applications.
- ✓ 135° Point Tip: Designed for self-centering and reducing drill bit walking, ensuring accurate hole starts.
- ✓ Twist Design: Optimizes chip evacuation, minimizing friction and heat buildup during intensive drilling.
Why We Recommend It
We recommend this premium set for its robust M35 cobalt composition and thoughtful design features. The combination of heat resistance, a wide size range, and the 135° split point makes it an excellent choice for anyone working with tough metals regularly. It provides reliability and efficiency for challenging drilling projects.
Best For
Individuals who frequently encounter hardened metals, stainless steel, or cast iron and require a dependable, comprehensive set for precise and efficient hole drilling.
Pros and Cons
Pros:
- High-quality M35 cobalt material offers extended bit life.
- Excellent performance on hard and abrasive materials.
- Comprehensive set covers most common drilling diameters.
- Quick and efficient drilling due to optimized point tip and twist design.
Cons:
- Some reports of individual bits breaking under specific extreme conditions.
- May require proper cooling lubricant for maximum longevity with continuous heavy use.
Customer Reviews
Customer Review: “I had a use case where a machine screw had broken off in a location that wasn’t easy to access. I decided versus pulling the piece of equipment apart to improve access, I’d spend the money on a set of these with the hopes it would catch as I was drilling out the broken off screw. The screw broke down and these bits were invaluable.”
Customer Review: “I purchase this set just under a year ago. I have not use these drill bits but a couple of times and 4 have already broken.10/6/2025 Update. Macxcoip Cobalt Drill Bits set seller reached out address any issues or concerns in my satisfaction with the product I received. They offer a full refund or to ship a new set.”
5. Champion Brute Platinum 29-Piece HSS 1/16-1/2″ Metal Cutting Drill Bit Set, 135° Split Point
The Champion Brute Platinum 29-Piece HSS Metal Cutting Drill Bit Set is designed for superior performance and longevity, often outperforming cobalt bits in certain scenarios. Its unique XL28 treatment allows it to flex where cobalt might chip, offering exceptional durability. This set provides a comprehensive range of sizes for extensive metalworking applications.
Key Features That Stand Out
- ✓ Brute Platinum XL28 Treatment: Enhances toughness and allows flexing, reducing chipping and snapping common in cobalt bits.
- ✓ 135° Split Point Angle: Ensures precise starts, prevents walking, and enables faster penetration.
- ✓ Tapered Web Geometry: Provides added strength and rigidity to the drill bit, preventing breakage.
- ✓ Flatted Shanks: Designed for secure and fast chucking in keyless power tools, minimizing slippage.
Why We Recommend It
Champion Brute Platinum bits are renowned for their strength and longevity. This set is recommended for its innovative XL28 treatment, which gives it an edge in terms of durability and resistance to breakage compared to some cobalt alternatives. If you need a robust, long-lasting HSS set for heavy metal cutting, this is an excellent choice.
Best For
Professional tradespeople and serious fabricators who need a highly durable and fast-cutting HSS drill bit set for various metals, especially those looking for an alternative to cobalt with improved chip resistance.
Pros and Cons
Pros:
- Drills up to 3x longer and 2x faster than many competitors.
- Superior flexibility and resistance to chipping compared to cobalt bits.
- Highly accurate drilling with 135° split point.
- Flatted shanks ensure secure grip in drill chucks.
Cons:
- May not be ideal for extremely hardened steel or exotic alloys where carbide is necessary.
- Premium price point for an HSS set.
Customer Reviews
Customer Review: “I’ve drilled a bazillion holes in every kind of material you can think of over more than 65 years of being an automotive technician, and used up my share of drill bits. I’ve learned to recognize good ones from bad ones and I’d have to say that these appear to be among the best quality around. Beautifully made, perfectly ground, nice case.”
Customer Review: “These bits are truly amazing. I was struggling with a thick steel plate project and these Champion Brute bits just powered through it. The durability is outstanding, definitely worth the investment for serious work.”
Complete Buying Guide for Best Metal Cutting Drill Bits
Essential Factors We Consider
Choosing the best metal cutting drill bits involves more than just picking the shiny ones. Key considerations include the material composition, point angle, coating, and overall design. For drilling tough metals like stainless steel or hardened alloys, you’ll want bits made from cobalt (M35 or M42) or even solid tungsten carbide, as these materials offer superior heat resistance and hardness. The 135° split point angle is highly recommended for metal as it prevents “walking” and allows for immediate penetration without needing a pilot hole. Coatings like Titanium Nitride (TiN) or Aluminum Titanium Nitride (AlTiN) can further enhance hardness and reduce friction, extending bit life. Always match the drill bit’s properties to the specific type and thickness of metal you plan to drill.
Budget Planning
The cost of metal cutting drill bits can vary significantly. While a budget-friendly High-Speed Steel (HSS) set might suffice for softer metals or occasional use, they won’t stand up to harder materials. Investing in cobalt drill bits or, for extreme applications, tungsten carbide bits, will typically cost more upfront. However, their superior durability and cutting efficiency often result in significant long-term savings by reducing replacement frequency and project time. Consider your typical workload: frequent heavy-duty tasks warrant a premium investment, while lighter, less frequent work might be satisfied with a mid-range cobalt set.
Final Thoughts
Selecting the right metal drill bits is crucial for successful and efficient metalwork. Pay close attention to the material, point geometry, and coating to ensure your bits can handle the specific types of metal you’re working with. A well-chosen set will not only make your tasks easier but also improve the quality of your work and extend the lifespan of your tools. Don’t underestimate the impact of a high-quality drill bit on your productivity and project outcomes.
Frequently Asked Questions
Q: What are the best drill bit materials for cutting metal?
A: For cutting metal, the best materials are typically High-Speed Steel (HSS) for softer metals like aluminum, copper, and mild steel; Cobalt (M35 or M42) for harder metals such as stainless steel, cast iron, and titanium; and Solid Tungsten Carbide for extremely hard or abrasive materials like hardened steel, tool steel, or exotic alloys.
Q: Can I use regular drill bits for stainless steel?
A: While you might be able to make a shallow mark, regular HSS drill bits are not recommended for stainless steel. Stainless steel is a tough, work-hardening material, meaning it gets harder as you try to cut it. For effective and efficient drilling without dulling your bits, you should always use cobalt drill bits (M35 or M42) as they can withstand the higher temperatures and abrasion.
Q: What does “135° split point” mean?
A: A 135° split point refers to the angle and design of the tip of the drill bit. This aggressive angle, combined with a “split” at the very center of the tip, creates two additional cutting edges. This design helps the drill bit to self-center, preventing “walking” on the workpiece, and allows for faster penetration with less feed pressure. It’s particularly beneficial when drilling metal, especially harder alloys, as it eliminates the need for a pilot hole or center punch.
Q: How do I prevent drill bits from breaking when drilling metal?
A: To prevent breakage, ensure you use the correct bit material for the metal, apply constant and firm pressure (avoiding “riding” the bit), use a slow drill speed for harder metals, and always use cutting fluid or lubricant. Overheating is a common cause of breakage and dulling, so keep the bit cool. Also, clear chips frequently to prevent clogging and excessive heat buildup.
Q: What’s the difference between HSS and Cobalt drill bits?
A: HSS (High-Speed Steel) drill bits are made from basic tool steel and are good for general-purpose drilling in softer metals, wood, and plastics. Cobalt drill bits are an alloy of HSS with 5-8% cobalt (M35 or M42). The added cobalt makes them significantly more resistant to heat and abrasion, allowing them to retain their hardness and sharpness at higher temperatures. This makes cobalt bits ideal for drilling harder metals like stainless steel, cast iron, and titanium, where HSS bits would quickly overheat and dull.
Choosing the right metal cutting drill bits is a critical step for any successful project involving tough materials. Our roundup has highlighted top-performing options, from the extreme durability of tungsten carbide to the versatile strength of cobalt sets. Remember to prioritize the bit material, point angle, and construction to match your specific drilling needs. Don’t let inferior tools hold you back – invest in quality bits that deliver precision and longevity. Explore our recommendations today to find the perfect set for your workshop and make your next metal project a seamless success!
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.
