The Best 49 Cobalt Drill Bits for Serious Drilling

If you're working with tough metals like stainless steel, alloy, or brass, you'll want the right tools for the job - and that starts with the right drill bits. Cobalt drill bits are engineered specifically for these challenging materials, offering exceptional durability and precision. Our roundup compares the top cobalt drill bits on the market, helping you find the perfect tool for your metalworking projects.

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Reviews

Drill America D/ACO 9/16" Cobalt Drill Bit

These gold-finished drill bits pack serious punch when it comes to tough materials like stainless steel and titanium, thanks to their Cobalt construction that handles heat and pressure better than regular drill bits. The 135-degree split point keeps them from wandering around in your material, making your job easier. While some users have noted a sticky coating that needs cleaning off before use, the overwhelming consensus is that these bits really do what they promise and last longer than cheaper alternatives.

MACXCOIP M35 Cobalt Drill Bit Set

These M35 cobalt drill bits deliver exceptional performance on a wide range of materials including stainless steel, cast iron, and hardwood, with their 135-degree point design and twist construction enhancing both cutting efficiency and precision. The 19-piece set spans from 1mm to 10mm, providing versatile coverage for most drilling needs, while its hardened steel construction ensures durability for long-term use.

Drill America 1/4 to 1/2 Inch Cobalt Drill Bit Set

These durable cobalt drill bits are built to handle serious metalwork, thanks to their heat-resistant construction and precise 135-degree split points. The right-hand helical design keeps them whisper-smooth as they munch through steel and stainless, while the snug round shanks play nicely with all your tool holders. Best of all, they're all wrapped up in a gold-plated 5-pack that's as patriotic as it is practical.

DRILLFORCE 1/16 Cobalt Drill Bits

These durable 1/16" cobalt twist drill bits combine high-speed steel with M35 cobalt steel for exceptional toughness and wear resistance. The 135-degree split-point design reduces initial drilling force and prevents the bit from walking on the work surface, making them ideal for tough metal applications like hardened steel and stainless steel. The 10-piece set comes neatly organized in a plastic bag with size labels for easy access and identification.

Topline USA No. 4 Cobalt Drill Bits

These durable cobalt drill bits combine high performance with lasting lifespan, featuring an 8% cobalt content and precision engineered 135-degree split points. Their solid blank construction ensures consistent precision, while the M42 grade delivers superior cutting capabilities in challenging materials like stainless steel and titanium. The included storage tube keeps the precision tools organized and protected for consistent access in demanding environments.

Intoo HSS Cobalt Drill Bit Set

These triangle-shank drill bits combine durable cobalt steel with a precise 135-degree golden ratio tip for exceptional performance on hard metals like stainless steel. The strong metal storage box protects the 21-piece set, while proper technique like using the lowest recommended RPM can triple the drill's lifespan.

Drill Hulk 5/16-Inch Cobalt Steel Twist Drill Bits

Made from high-speed steel with a 5% cobalt content, each 5/16-inch drill bit in this pack of six features a 3-3/16-inch flute length and 4-1/2-inch overall length, with a 135-degree split point for reliable start and easy penetration. The cobalt alloy construction provides superior durability when working with tough materials like stainless steel and other hard metals. The included cases help keep the sharp bits protected and organized.

Michigan Drill 210C Cobalt Taper Shank Drill

These premium cobalt drill bits offer superior durability for challenging materials like stainless steel and titanium, thanks to their 135° notched point design. The increased red hardness and abrasion resistance make them ideal for precision drilling in high-tensile strength metals where standard drill bits would quickly wear out.

Drill America D/ACO75 #75 Drill Bit

Made from cobalt steel in the USA, these durable jobber drill bits exceed aerospace standards for precision and strength. With their 135-degree split points and 1/4" flute length, they handle tough materials like stainless steel and titanium with ease while maintaining straight, accurate holes. The high-red hardness allows up to 30% faster drilling speeds than traditional M2 high-speed steel bits, making them a smart investment for serious drilling tasks.

Drill America 29 Piece Cobalt Drill Bit Set

This versatile drill bit set features precision cobalt bits with gold oxide coating, delivering exceptional performance for drilling through tough materials like steel and acrylic. The gold-stepped point design reduces heat and increases bit lifespan, while the 135-degree split tip ensures smooth, accurate drilling. The set includes 29 bits ranging from 1/16" to 1/2", complete with a storage case for convenient organization.

Drill America 12-Inch Cobalt Drill Bit

These 3/16-inch cobalt twist drill bits deliver exceptional performance on tough materials like stainless steel and titanium, thanks to their precision 135-degree split-point design that prevents wandering during drilling. The round shank construction allows compatibility with various tool holders, while the 12-inch length provides the reach needed for deeper applications. With 18 glowing five-star reviews, these highly-rated bits are a practical choice for both professional and DIY use.

Precision 37/64" Cobalt Drill Bit

Cobalt drill bit featuring a 37/64 inch diameter and 135-degree point angle, with bronze-finished high-speed steel construction. Right-hand cut design and 2.5-inch flute length deliver consistent performance in various materials.

Drill America D/astco25/64 Cobalt Drill Bit

These sturdy drill bits pack a lot of capability into their compact design, featuring a 135-degree split point that makes them exceptionally reliable for both portable and machine drilling tasks. Built to precise Aerospace standards, they've earned a solid reputation among professionals who need consistent performance when working with iron and steel materials. The cobalt construction and right-hand spiral flutes keep your drilling process smooth and efficient, even when tackling tough materials.

29pcs Cobalt Drill Bits Set

When precision matters most, these M35 cobalt twist drill bits deliver with their 135° external points and single-unit construction. The 29-piece set eliminates the need to switch between different sizes, while the silver-toned hex shank design ensures secure mounting in most drill models. The premium cobalt material withstands even the toughest metals, from stainless steel to titanium, making these durable bits essential for both DIY projects and professional workstations.

Kobalt 2-Piece Titanium Coated HSS Twist Drill Bits

These titanium-coated drill bits handle both metal and wood with precision, thanks to their 135-degree split point that keeps them from wandering. At just 1/8-inch in diameter, they're surprisingly capable, managing to drill through multiple layers of sheet metal and hardwood without dulling quickly. While some users have found them a bit fragile for heavy-duty applications like granite, the ones who've used them for ceramic tile work praise their ability to cut through glass and tile like butter, with none of the chipping or fishtailing you might expect from small bits.

Drill America 3/16" Cobalt Split Point Drill Bits

The Drill America 3/16" cobalt drill bits are built tough enough for serious metalworking, with a 135-degree split point that helps them start holes straight every time. Their short stub design makes them ideal for drilling through thick materials like titanium and PH stainless steel, where longer bits might struggle. With their right-hand spiral flutes, these bits pull chips out of the hole as they drill, keeping the cut fresh and preventing clogs – perfect for both portable and machine use.

Kobalt 14-Piece Titanium-Coated Drill Bit Set

The split-point design helps these durable cobalt drill bits start cutting immediately, especially for larger bits over 1/8 inch. The titanium coating significantly boosts both the speed and lifespan of these high-speed steel tools, making them a practical choice for everyday drilling in wood, metal, and plastic. While the cases can be finicky, the bits themselves have proven reliable for many users, though some might find their occasional tendency to break disappointing.

Grizzly Pro M35 Cobalt 45° Step Drill Bit

The Grizzly Pro M35 Cobalt Quick-Release Hex Shank drill bit combines precision and durability for efficient drilling and countersinking in one operation. With its specialized 45° step design and high-speed steel construction reinforced with 5% cobalt, this bit provides exceptional longevity while minimizing chip buildup and maintaining consistent depth. The quick-release hex shank design reduces vibration and heat buildup during extended use, making it especially useful for applications requiring flush screw heads and chamfered edges.

toolant Four Spiral Flute Cobalt Step Drill Bit

These premium cobalt drill bits pack a serious punch with their four-spiral flute design that slices through materials like a hot knife through butter. The aluminum titanium nitride coating bumps up the durability factor tenfold, making these bits incredibly resistant to wear and tear. Whether you're drilling into stainless steel, aluminum, wood, or plastic, these multi-size bit options will handle it all with ease.

Kobalt Titanium-Coated Drill Bit

The Kobalt 5/16-inch titanium-coated drill bit delivers exceptional performance across various materials, from metal to wood, while its right-handed split-point design ensures smooth penetration. The 1/4-inch hex shank provides secure connections with standard and impact drivers, including compatibility with the Kobalt 2-in-1 connector system. This heavy-duty bit combines durable construction with impressive drilling speeds to extend tool life and maintain precision throughout its 3-1/16-inch depth capacity.

Precision 7.1mm Cobalt Jobber Drill

These precision twist drills combine a 7.1mm diameter with a 135° point for accurate hole making. Made from high-speed steel with a durable bronze finish, they're designed for right-hand cutting in standard spiral formation. The 4xD flute design and 69mm length make them versatile for various drilling applications.

Drill America D/ammco 12.00mm Cobalt Drill Bit

Made in the USA, these 12mm cobalt drill bits combine a 135-degree split point with premium gold coating for superior performance on the toughest materials. The right-hand twist bit reaches impressive 30% faster speeds than conventional alternatives, making quick work of stainless steel, inconel, and titanium. At just over 149mm long with a 111mm flute, these precision-engineered bits deliver the durability you'd expect from National Aerospace standard 907.

POWERTEC Qdb2019 Cobalt Drill Bit Set

These long-lasting drill bits combine high-speed steel with cobalt for superior performance on tough metals like stainless steel and cast iron. The 135-degree split point design ensures precise, centered holes while reducing the effort needed to penetrate tough materials. The heat-resistant alloy helps maintain bit integrity during use, making these versatile tools a practical choice for serious metalworking projects.

DRILLFORCE 1/4in. x 4in. Cobalt Drill Bits

These durable 1/4-inch cobalt drill bits deliver premium performance for both professional and DIY projects. Made from high-speed steel with a titanium coating, they maintain their sharpness when drilling through metals, wood, and plastics, including stainless steel. The 135-degree angle point and spiral flute design enhance cutting efficiency while reducing chip buildup.

Drill America D/A13J-CO-SET Cobalt Drill Bit Set

These premium cobalt steel drill bits offer exceptional performance on challenging materials like stainless steel and titanium, thanks to their 135-degree split points and National Aerospace 907 standard construction. The right-hand spiral flutes efficiently remove chips during cutting, while the round shank design ensures compatibility with various toolholding systems. Each set includes 13 precision-ground bits with gold oxide finishes, carefully packed in a durable metal case for protection during storage and transport.

29-Piece Cobalt Drill Bit Set

This comprehensive drill bit set combines precision engineered cobalt drill bits with a practical round shank design that ensures compatibility with most tool systems. The 135-degree split point and dual-fluted construction optimize chip removal during counterclockwise rotation, while the compact metal case keeps 29 precision-sized bits organized for professional use in demanding applications.

POWERTEC QDB2014 1/8-Inch Cobalt Drill Bit Set

POWERTEC's 1/8-inch cobalt drill bits blend premium M35 steel with 5% cobalt for superior performance on hardened materials including stainless steel, iron castings, and nickel alloy. The 135-degree split point ensures precise hole placement with minimal wandering, while the heat-resistant construction extends bit longevity by reducing burnout. Measuring slightly over 2.75 inches in length, these bits provide 1.56 inches of effective drilling depth and maintain cutting edge integrity through multiple resharpening sessions, making them ideal for demanding metalworking applications.

YG1 NC Spotting Drill Set

These precision drills combine durable YG1 cobalt construction with ergonomic 120-degree angles for smooth centering during CNC operations. The set includes three sizes (1/8", 3/16", and 1/4") with progressively longer flutes that allow for both centering and chamfering in one pass, improving efficiency and accuracy on NC machines. Attractive pricing and robust construction have earned these drills consistently positive reviews from users who appreciate their performance in professional settings.

DRILLFORCE 21-Piece Cobalt Drill Bit Set

If you're drilling into metals like steel, copper, or aluminum, these strong cobalt drill bits get the job done with their durable high-speed steel core. The 135-degree split-point design makes them easier to start in tough materials, and their straight round shank fits most drill chucks. This set has earned high praise from users who find it works great on both soft and hardened metals.

Drill America 1/4" Cobalt Split Point Drill Bits

These 1/4-inch cobalt drill bits offer exceptional performance on challenging materials like stainless steel and titanium, thanks to their stubby design that excels in tight spaces. The self-centering 135-degree split point and efficient chip evacuation system make them incredibly practical for both portable and machine drilling applications. With thousands of satisfied customers praising their reliable performance and longevity, these durable bits represent a solid investment for serious drilling needs.

Drill America #30 Cobalt Drill Bits

These tough cobalt drill bits can handle serious metal like stainless steel and titanium thanks to their high hardness. With a 30% speed boost over regular high-speed steel bits, they'll make quick work of those thick materials you're dealing with. Reviewers love how reliably these bits perform, though one notes they're not quite up to snuff for drilling through sheetrock screws.

Drill America TSD8EL #8 Extra Long Cobalt Drill Bit

At just over 5mm long, this 1/4-28 threaded shank drill bit packs a punch with its 135-degree split point and black oxide finish. The M42 cobalt steel construction shines through when drilling tough materials, delivering longer tool life than standard high-speed steel alternatives. The extra length gives you plenty of leverage while reducing the risk of breaking through the material's surface.

JNBPro 5PC Countersink Drill Bit Set

These high-speed steel countersink bits combine durability and precision for professional metalworking. The 5-fluted design reduces vibration while the 82-degree angle ensures smooth drilling. Whether you're working with steel or aluminum, these bits provide clean chamfers that hand drills can't match.

Warrior 61886 115 PCB Drill Bit Set

These cobalt drill bits cut through tough materials like cast iron and stainless steel with ease, thanks to their 135-degree tips that slice through metal like butter. The professional-grade bits retain their sharpness at high temperatures, making them perfect for serious DIY projects and heavy industrial use. While the included storage case might not be premium quality, the bits' durability more than makes up for it, lasting three times longer than standard drill bits while maintaining exceptional precision.

amoolo 13-Piece Cobalt Drill Bit Set

These premium cobalt twist drill bits offer exceptional durability for heavy-duty drilling tasks. The 6542 high-speed steel construction, enhanced with 5% cobalt, provides superior wear resistance and extended longevity compared to standard drill bits. The fully ground spiral grooves reduce friction and heat, while the 135° split point design ensures precise, hassle-free drilling through even the hardest materials like stainless steel and cast iron.

13pcs COMOWARE Cobalt Drill Bit Set

This professional drill bit set combines precision engineering with durable construction, featuring 13 cobalt-high-speed steel bits ranging from 1/16" to 1/4". The precision 135° split point design ensures clean, efficient drilling in even the hardest materials, while the included indexed storage case keeps your tools organized and within reach.

Metric M42 Cobalt Drill Bits

This high-quality drill bit set combines premium M42 cobalt steel construction with 3-step point design for superior performance on stainless steel and hard metals. The premium cobalt alloy provides exceptional heat and wear resistance, ensuring longer tool life compared to standard high-speed steel alternatives. At just under 7 inches long, these 13mm precision drill bits offer the right balance of reach and control for challenging industrial applications, while their versatility allows them to tackle everything from aluminum and plastic to the toughest stainless steel alloys.

13-Piece Cobalt Drill Bit Set

This 13-piece cobalt drill bit set delivers exceptional performance on tough materials like metal, stainless steel, and cast iron thanks to its 135-degree split point design. The durable plastic storage case keeps your bits organized and protected, while the titanium finish enhances their longevity. Each bit is precisely engineered for consistent results when drilling through even the hardest materials.

STROTON 6% Cobalt Drill Bits

These premium cobalt drill bits deliver exceptional durability and efficiency, with a robust 6% cobalt composition that maintains its sharpness through extended use. The high 66-69 Rockwell hardness ensures trouble-free drilling through stainless steel, iron, aluminum, and other tough materials, while the 135-degree cutting angle and 3-flat shank design help maintain consistent performance. At just 3/8" in diameter, these reliable bits come in a two-pack that's perfect for both professional and serious DIY applications.

Drill America 16mm Cobalt Drill Bit

Made from cobalt steel for superior cutting performance on tough materials like stainless steel, this durable drill bit combines a 16mm gold-finished cobalt tip with a 120mm long spiral flute design that evacuates chips efficiently during right-hand cuts. The round shank design allows for versatile toolholding while the split-point construction maintains cutting accuracy and sharpness over time. Meeting National Aerospace standard 907, these bit meet professional quality expectations for precision drilling projects.

STROTON 13-Piece Cobalt Drill Bit Set

These premium cobalt drill bits offer exceptional durability when working with tough materials like stainless steel and cast iron, thanks to their high heat and wear resistance. The split point design makes them easier to start in materials while reducing the risk of the bit wandering across the work surface. With the right technique and cutting speeds, these versatile bits can handle everything from soft plastic to hard metal, making them a valuable addition to any tool collection.

Drill America D/A15J-CO-SET Cobalt Drill Bit Set

These carefully crafted drill bits combine exceptional hardness with remarkable durability, making them ideal for challenging tasks that conventional drills can't handle. The 15-piece set, featuring increments as precise as 1/32nd of an inch, can conquer materials like stainless steel and titanium with ease – thanks to their cobalt core that allows up to 30% faster cutting speeds than standard options. Each bit sports a self-centering 135-degree split point and a gold-finished surface, while their round shanks ensure compatibility with most drill systems on the market.

MACXCOIP Cobalt Drill Bit Set

This comprehensive collection of 115 cobalt drill bits features precise fractional, letter, and numbered sizes from 1/16" to 1/2" in 1/64th increments. The M35 high-speed steel construction combines durability with exceptional cutting performance on stainless steel, cast iron, copper, aluminum, and various plastics and woods. The included drill holders and indexed storage system keep the bits organized and easy to find, while the self-centering twist design enhances accuracy and efficiency during use.

Migiwata M35 Cobalt Steel Drill Bits

These 13-piece drill bits are designed specifically for cutting through tough materials like stainless steel and cast iron, with their unique M35 cobalt alloy formulation allowing them to drill through 5mm thick 304 stainless steel in just 5 seconds. The 135-degree split point design helps reduce heat buildup by minimizing chip thickness and increasing chip removal, while the straight shank design provides excellent stability during use. The bits require cooling liquid to prevent overheating and maximize their long-term performance, and while they're incredibly durable thanks to the cobalt alloy, users should note that they're not suitable for hardened steel or high-carbon steel applications.

HIDOTOL Cobalt Drill Bit Set

This detailed set of 29 precision drill bits tackles tough materials like stainless steel and cast iron with confidence, thanks to its M35 high-speed cobalt composition. The 135-degree split points and self-centering design ensure accurate, efficient drilling, while the fully ground twist shank clears chips quickly and reduces heat buildup. The included bit sizes range from 1/16" to 1/2", incrementing in 1/64" steps, providing the right tool for every job from delicate woodwork to aggressive metal cutting.

CO-Z 50-Size Cobalt Drill Bit Set

Made from durable cobalt high speed steel with titanium coating, these multi-sized step drill bits stay sharp and shiny for years. The three-shank design fits 1/4", 3/8", and 1/2" chucks, while the non-walking tip cuts through steel, aluminum, wood, and plastic efficiently. The organized aluminum case keeps your bit set protected and easy to transport.

Drill America D/a29j-co Set

This high-performance drill bit set combines aerospace-grade M42 cobalt steel with 135-degree split points for precise drilling in tough materials like stainless steel and titanium. The 29-piece collection, featuring 1/64 inch increments from 1/64 to 1/2 inch, is housed in a durable metal case and mounts easily in most drill systems thanks to its round shank design. The right-hand spiral flutes efficiently evacuate chips during cutting, while the patented split point reduces drilling pressure and improves centering accuracy.

STROTON Metric M42 8% Cobalt Drill Bits

Craftsmanship shows in every 8% Cobalt M42 drill bit, where you'll notice the premium 68-70 HRC hardness that cuts through stainless steel and hard metals like a sharp-edged Swiss Army knife through butter. These aren't just any drill bits—they run 3-5x faster while maintaining that razor-sharp edge that slices metal into neat strips instead of forcing dull bits to grind through material. With 19 pieces ranging from 1mm to 10mm, this set covers everything from fine work to heavy-duty projects, all while keeping your drilling time and costs way down compared to standard bits.

Milwaukee 48-89-2331 15-Piece Cobalt Drill Bit Set

When you need drill bits that can handle serious metal work, these Milwaukee cobalt bits pack quite a punch. With their unique three-flat design and aggressive helix shape, they tear through tough materials like hot butter. The set includes 15 bits ranging from 1/16" to 1/2", each wrapped in durable cobalt alloy for maximum longevity.

Buyer's Guide

Lithium-based cobalt drill bits combine exceptional durability with consistent performance for professional applications. These specialized bits feature a cobalt alloy core that enhances their resistance to heat and wear, making them ideal for drilling through dense materials like stainless steel and brass.

Core Technology

The cobalt alloy composition gives these drill bits a higher concentration of cobalt (typically between 8-12%) compared to standard high-speed steel (HSS) bits, which increases their strength and heat tolerance. This modification allows the bit to maintain its sharpness and cutting efficiency over longer periods and in tougher materials.

Construction and Coatings

Professional cobalt drill bits usually feature a multi-layered construction with a hardened outer shell of tungsten carbide titanium (WC TiN) or other advanced coatings. These coatings not only extend the bit's lifespan but also reduce friction, improve chip removal, and prevent corrosion. The core shaft is precisely engineered to maintain concentricity and minimize deflection during use.

Size and Taper Design

The standard diameter range for cobalt drill bits spans from 1/8" to 3/4", though larger sizes may be available for specialized applications. These bits typically feature a 118-degree or 135-degree chisel point angle, with the latter providing better guidance and increased cutting efficiency. The patented taper design helps prevent bit wander and ensures accurate hole placement.

Application and Maintenance

Cobalt drill bits require proper maintenance to optimize performance and extend their usable life. After use, allow the bit to cool completely to prevent thermal shock, then clean it thoroughly with mild soap and water. Store the bits in a dry environment and periodically inspect for signs of wear or damage. Regular sharpening with professional-grade tools can restore their cutting edge and improve overall performance.

FAQ

What are cobalt drill bits?

Cobalt drill bits are specialized tools made from a cobalt-chromium-molybdenum alloy. These high-alloyed steel bits are engineered to resist heat and maintain their sharpness during prolonged drilling operations.

Compared to standard drill bits, cobalt bits can withstand higher temperatures and maintain their integrity when drilling through hardened materials like stainless steel and bronze.

What are the key benefits of cobalt drill bits?

Cobalt drill bits offer superior heat resistance and durability, making them ideal for precision drilling in tough materials. Their ability to maintain cutting edges at elevated temperatures reduces bit wear and extends tool life.

The increased durability of cobalt bits results in fewer tool changes and reduced material waste, making them cost-effective for demanding drilling applications.

When should I use cobalt drill bits?

Use cobalt drill bits for drilling through stainless steel, bronze, brass, and other heat-sensitive materials. They are particularly useful in applications requiring consistent hole diameters and depths.

Avoid using cobalt bits for soft materials like wood or aluminum, where standard twist bits will suffice. These specialized bits are optimized for precision in harder materials where standard bits would quickly dull or break.

How do I maintain cobalt drill bits?

Regularly clean cobalt drill bits after use to remove debris and prevent galling. Store them in a dry environment to prevent rust, and use appropriate lubricants during use to reduce friction and heat buildup.

Inspect bits for signs of wear before each use. Replace any that show signs of thermal damage, cracks, or excessive wear to maintain consistent drilling performance.

What are the limitations of cobalt drill bits?

Cobalt drill bits are more expensive than standard twist bits and are not suitable for drilling soft materials. Their specialized design makes them less versatile for general-purpose drilling applications.

These bits have specific torque and speed requirements that may limit their use in older or less precise drill systems. Operating them outside their recommended parameters can reduce their lifespan and effectiveness.

How do cobalt drill bits compare to other specialty drill bits?

Cobalt drill bits offer superior performance in stainless steel and bronze compared to tungsten carbide-coated bits. While more expensive, they provide longer tool life and better hole quality in hardened materials.

For materials softer than 16 Rockwell hardness, standard twist bits or masonry bits are more practical. Cobalt bits are one of several specialized options for different drilling challenges, each with its own optimal application.