Best Drill Bits For Drilling Hardened Steel (2024 Update)

This drill bit is a top-of-the-line tool for high-precision drilling applications. With a blade diameter of 3/16, a straight flute length of 1 inch, and a total length of 2 inches, this bit is perfect for a wide range of drilling tasks. The 118-degree point ensures accuracy and precision, while the T.I.R. of less than 10um (0.01mm) guarantees consistent and reliable performance.

Crafted from solid tungsten steel, this drill bit is built to last, with a TiAlN coating that helps to extend its lifespan even further. The coating also helps to increase cutting speeds, allowing for more efficient drilling and faster results. This bit is ideal for use in high-temperature drilling applications, thanks to its exceptional durability and heat resistance.

Whether you're working with carbon steel, chilled cast iron, ductile iron, gray cast iron, die steel, heat-resistant alloy steel, or tool steel, this drill bit is the perfect tool for the job. Its versatility and precision make it an essential tool for any professional or DIY enthusiast.

This drill bit is sold individually, and comes with a convenient package to keep it safe and secure during transport. With its exceptional performance and durability, this drill bit is an investment that you can count on for years to come. Whether you're a professional contractor or a DIY enthusiast, this drill bit is sure to exceed your expectations and help you achieve the best results possible.

This 2-pack of premium solid carbide drill bits is a must-have for any business that requires reliable, high-speed drilling. Unlike traditional high speed steel bits, these tungsten carbide (WC) bits offer better rigidity, greater heat resistance, and can cut metal both "wet" or "dry". They are perfect for a wide range of applications such as aerospace drilling jobs, precision machining, hobby supply, and more.

These carbide drills are recommended for use on a variety of metals including chrome, titanium, inconel, stainless steel, alloys, low-medium-high carbon steel, aluminum, copper, glass, plastics, composite materials, and cast iron. They stay sharp many times longer than traditional steel bits, making them ideal for the toughest of applications.

The optimal design of these carbide drills ensures accurate hole sizing and minimizes drill wander with their 118° four facet point angle. Their jobber length and precision ground construction are engineered for high feed rates with good chip disposal. Their smooth finish increases chip flow, while the higher flute angle of their spiral flutes removes chips more easily.

These carbide drills have a flute length of 1-3/8 inch, an overall length of 2-1/2 inch, and a drill size of 5/32 inch. They have a tungsten carbide grade (ISO) of K20, a binder of 8% cobalt, and a hardness of 91.3 HRa. They are uncoated for maximum versatility.

It is important to note that tungsten carbide is a composite material that may look like a metal, but it is actually a combination of tungsten carbide powder mixed with cobalt as a binder metal. This results in a material that is more like a ceramic than a metal, with a hardness of 9 on the Mohs scale (compared to diamond at 10 and hard steel around 5). The hardness of these carbide drills makes them brittle with virtually no plasticity, meaning that unstable drilling can result in a broken bit. Therefore, it is recommended to use these drills with a rigid drill press or milling machine for the best results.

Introducing the 10Pcs Cobalt Drill Bits Set, a must-have for all your drilling needs. This set includes 10 pieces of 3/16” (Dia 4.76mm) x 2-5/16” (Flute Length 58.74mm) metal drill bits, fitting the majority of power drills available on the market. The set also comes with a portable plastic case for convenient storage and organization.

Crafted from industry-grade M35 high-speed steel, these drill bits are much harder than HSS used in other similar sets. With a 5% cobalt content, these drill bits offer increased wear-resistance and durability, making them a reliable option for all your drilling needs.

The fully ground spiral groove design of these drill bits clears particles quickly, decreasing friction and heat for a faster and cooler drilling performance. The 135° split point with straight shank of these bits prevents walking and ensures precise and faster drilling. Plus, you won’t need a center punch for these bits.

These drill bits are perfectly suitable for cutting through hard metals such as stainless steel, steel, sheet metal, and cast iron, as well as plastic, aluminum alloy, wood, and other softer metals. However, it is important to pay attention to speed, pressure, and heat control during drilling to ensure the best results.

The 10Pcs Cobalt Drill Bits Set comes with a 90-day warranty. If you are not fully satisfied for any reason, please contact the seller for a 100% refund or replacement. Invest in this durable and reliable drill bit set for all your drilling needs.

The 3/32-Inch Cobalt Drill Bits set is a must-have for anyone in need of high-quality drill bits. These drill bits are made of 5% Cobalt High Speed Steel M35, which ensures that they are durable and have higher heat and abrasion resistance compared to ordinary drill bits. This feature ensures that the drill bits have an extended tool life, making them a wise investment for anyone who needs to drill through tough materials.

The precise 135° split point and twist design of these drill bits prevent them from walking, ensuring that they drill through the material effortlessly. Additionally, this feature enables the drill bits to clear chips and particles faster, resulting in a cleaner and more efficient drilling experience.

These professional-grade drill bits are widely used and are more suitable for hardened materials. They are particularly successful in cutting through hard metals such as stainless steel, cast iron, high-temperature alloy, titanium alloy, hard plastics, and woods. They can also be used for softer materials. However, users must pay attention to speed, pressure, and heat control during drilling.

This set includes ten pieces of 3/32-Inch cobalt drill bits, making it a perfect choice for anyone who needs a reliable set of drill bits for their job. Whether you're a DIY enthusiast or a professional, these drill bits are sure to meet your needs.

This 10-piece set of cobalt steel twist drill bits is a must-have for any metalworking enthusiast. These bits are manufactured from M35 grade cobalt steel, which includes molybdenum and cobalt to create a hardened alloy with a Rockwell hardness of up to 67. This means they are much faster cutting and have an extra-long lifespan when compared to an average HSS drill bit, up to twelve times longer.

The 135° quick-cut splint point is self-centering, ensuring that the bit penetrates quickly with less pressure. This feature also ensures that it will not "walk" or "wander" while in use. These bits are particularly successful in cutting through hard metals such as stainless steel and cast iron, although they can be used for softer materials as well. However, they should not be used for hardened steel or high carbon steel. If the bit fails to penetrate, try adjusting the RPM.

This set includes 10 pieces of 3/16" diameter M35 grade cobalt steel twist drill bits, all of which are packed in a plastic case for easy storage and carrying. They are manufactured to German DIN338 standard, ensuring the highest quality and precision.

To make the most of these drill bits, the manufacturer has also included a downloadable user guide. This guide includes some tips for drilling metals, including an RPM chart for several common metals. These tips are based on customer reviews and some articles on the internet. By following these tips, customers can expect to achieve a much better result when using these bits.

The Century Pro Grade Cobalt Drill Bit Set is a comprehensive collection of drill bits that includes 28 pieces ranging in size from 1/16" to 1/2". These drill bits are made from 5% industrial quality M35 cobalt alloy high speed steel, which is known for its exceptional heat resistance, making it an excellent choice for use in power units with RPM speeds of 1,500 or more.

Unlike consumer-grade high speed steel drills, Century Pro Grade drills last up to 12 times longer, making them an excellent investment for anyone who regularly works with metal. The 135-degree quick-cut point allows for faster penetration, and it won't walk or wander on the starting surface, eliminating the need for a center punch or pilot hole.

In addition to its longevity, the Century Pro Grade Cobalt Drill Bit Set is designed for durability. The heavy-duty web resists breakage, and the straight shank provides a secure grip, ensuring a straight and accurate hole every time.

Whether you are a professional or a DIY enthusiast, you can rely on the Century Pro Grade Cobalt Drill Bit Set to deliver superior performance. Proudly made in the USA, this set is an excellent investment that will provide you with long-lasting, reliable use for years to come.

Introducing the Jobber Length Cobalt Drill Bit Set, a must-have addition to any professional or DIY enthusiast's toolkit. This set includes 12 pieces of 3/16-inch cobalt drill bits, each with a cutting diameter of 3/16 inches, a flute length of 2-5/16 inches, and an overall length of 3-1/2 inches. With a 135-degree split point and a 3-flat shank, these drill bits are designed for optimal precision and stability during use.

Crafted from high-speed steel and 5% cobalt, these drill bits offer superior heat resistance compared to typical HSS drill bits. The cobalt steel's high red hardness provides strong, durable performance, making these drill bits ideal for drilling in hard metals, including stainless steel.

One of the standout features of these cobalt drill bits is their ability to be repeatedly sharpened without damaging the cutting edge. The cobalt drill bit's hardness is uniform throughout the entire material, allowing for easy sharpening as needed, resulting in a longer lifespan and more efficient drilling compared to HSS drill bits.

This set includes a handy case for easy storage and organization, ensuring that your drill bits are always within reach. With the Jobber Length Cobalt Drill Bit Set, you can tackle any hard metal drilling project with confidence and ease. Invest in this reliable and high-performing set today and experience the difference for yourself.

The Lichamp 1/2" Cobalt Drill Bit set is an excellent tool for those looking to enhance their drilling experience. It features a unique 3x flute design that enables the drill bit to clear chips and particles faster, providing a more efficient drilling experience. The design is also patented, making it unique and exclusive to the Lichamp brand.

Made from industrial-grade M35 high-speed steel with 5% cobalt, this drill bit set offers superior hardness and wear resistance. It can withstand a maximum temperature of 1100 degreeF, making it ideal for drilling in heavy-duty tough metal, including hard abrasive alloy metal, hardened stainless steel, or cast iron. This versatile drill bit set can be used for various applications, making it a valuable addition to your tool collection.

The 135-degree split point tip and twist design of the Lichamp drill bit set increases cutting speed while providing a self-centering feature that prevents skating starts or walking. This feature ensures that your drilling experience is smooth and efficient. The drill bit set includes five 1/2-inch diameter HSS drill bits with round straight shanks. The shanks are well-organized and come in a clear PS case for easy storage and accessibility.

This 2-piece 1/2-Inch Cobalt Jobber Drill Bit Set includes two drill bits with a diameter of 1/2" and an overall length of 6" with a 4 5/16" flute. These cobalt drill bits are specifically designed for use in metal, stainless steel, nickel alloy, cast iron, and softer materials.

Crafted with M35 cobalt high-speed steel, these drill bits are of premium quality. They boast high abrasion resistance and optimal heat treatment for long-lasting durability.

The 135 degree split point design of these drill bits ensures quicker penetration with minimal pressure needed. This design also minimizes bit walking, ensuring a crisp and centered drill hole that doesn't require a center punch.

These drill bits are highly versatile and excel in metalworking applications when drilling in high-tensile strength materials. The tip can be sharpened to ensure peak-performance readiness at all times. Additionally, these drill bits work in both keyed and key-less drill chucks.

Investing in this 2-piece 1/2-Inch Cobalt Jobber Drill Bit Set is a wise decision for those who need a reliable and durable tool for their metalworking projects.

This set of drill bits is made from M35 grade cobalt steel, which is a hardened alloy that includes molybdenum and cobalt. This combination of materials gives the bits a Rockwell hardness of up to 67, making them ideal for cutting through hard metals such as stainless steel and cast iron. These bits have a longer lifespan than average HSS drill bits, with up to twelve times the life span.

The 10-piece set includes 15/64” diameter bits with a total length of 3.86 inches and a working length of 2.64 inches. The bits are manufactured to German DIN338 standards and are packed in a plastic case for convenient storage and transport.

The 135° quick-cut pilot split points are self-centering, ensuring that the bits penetrate quickly and accurately with less pressure. This feature also eliminates the possibility of the bits "walking" or "wandering" during use. The straight shank design allows for a firm grip and precise centering and is compatible with standard drill chucks and regular round collet chucks.

While these bits are particularly effective for cutting through hard metals with a hardness of less than HRC38°, they can also be used for softer materials such as copper and aluminum. It's important to note that they're not suitable for cutting through hardened steel or high carbon steel, and the RPM should be adjusted if they fail to penetrate.

To ensure that customers get the best results from these drill bits, the manufacturer has provided a downloadable user guide with tips for drilling metals. This guide includes an RPM chart for several common metals and is based on reviews and articles found online. Customers are encouraged to download this guide to achieve optimal results. Overall, this set of cobalt steel drill bits is an excellent choice for those looking for tough, long-lasting bits that can handle a variety of materials.