Best Drill Bit For Hardened Steel Bolt (2025 Update)

The Lichamp Three Flute Drill Bit is revolutionizing the drilling experience with its unique 3x flute design. This patented design allows for faster chip and particle clearance, providing you with a more efficient drilling experience.

Crafted from industrial grade M35 high-speed steel with 5% cobalt, this drill bit boasts a 4x lifespan compared to traditional options. The material's hardness provides exceptional wear resistance and can withstand temperatures of up to 1100 degrees Fahrenheit.

With its multiple application capabilities, the Lichamp Three Flute Drill Bit is perfect for heavy-duty drilling in tough metals. Whether you're working with hard abrasive alloy metal, hardened stainless steel, or cast iron, this drill bit will get the job done.

Say goodbye to frustrating starts and walking drills. The 135-degree split point tip and twist design of this drill bit increases cutting speed while ensuring self-centering. This means no more skating starts or wandering drills, resulting in smooth and precise drilling every time.

The Lichamp Three Flute Drill Bit Set includes 21 drill bits, housed in a convenient metal index case with a size chart for easy access and identification. The set covers a range of sizes, from 1/16-inch to 3/8-inch, in 1/64-inch increments.

Invest in the Lichamp Three Flute Drill Bit and elevate your drilling game. With its unique design, durable material, and versatile application, this drill bit set is a must-have for any DIY enthusiast or professional. Experience the difference for yourself and achieve exceptional results with every drilling task.

The Lichamp three flute patent design drill bit is a unique and efficient tool for drilling in heavy-duty metals. Its 3x flute design clears chips and particles faster, making the drilling experience more efficient. Made from industrial grade M35 high-speed steel with 5% cobalt, this drill bit can withstand a maximum temperature of 1100 degreeF and has a 4x longer lifespan than other materials.

This drill bit is ideal for drilling in tough metal, including hard abrasive alloy metal, hardened stainless steel, or cast iron. Its 135-degree split point tip and twist design increase cutting speed with self-centering and prevent skating starts or walking, resulting in smoothly drilled holes.

The drill bit has a 3/8" diameter and is made with round straight shanks. The package includes 5 pieces of 3/8" diameter hss drill bits, neatly organized in a clear ps case for easy storage and organization.

Whether you're a professional tradesman or a DIY enthusiast, the Lichamp three flute patent design drill bit is a reliable and efficient tool for all your heavy-duty metal drilling needs. Its unique design and durable material ensure a longer lifespan and smoother drilling experience, making it a valuable addition to any toolbox.

Introducing the Lichamp 3X Flute Design Drill Bit, a game-changer in the world of drilling. With its unique patent design, this drill bit is specially crafted to clear chips and particles faster, providing you with a more efficient drilling experience.

Crafted from industrial-grade M35 high-speed steel with 5% cobalt, this drill bit boasts a 4X lifespan compared to regular drill bits. The use of this premium material ensures exceptional wear resistance and allows the drill bit to withstand temperatures of up to 1100 degrees Fahrenheit, making it perfect for drilling in heavy-duty tough metals.

Speaking of metals, the Lichamp 3X Flute Design Drill Bit is a versatile tool that can handle a wide range of materials. Whether you're working with hard abrasive alloy metals, hardened stainless steel, or cast iron, this drill bit will effortlessly power through, making your drilling tasks a breeze.

Thanks to its 135-degree split point tip and twist design, this drill bit offers smooth drilling like no other. The self-centering feature ensures precise drilling, while the split point tip prevents skating starts or walking, giving you ultimate control and accuracy in your drilling projects.

The Lichamp 3X Flute Design Drill Bit comes in a convenient 13-piece set, housed in a sturdy metal index case. The case includes a size chart for easy bit access and identification, saving you time and effort in finding the right drill bit for your task. The set includes drill bit sizes ranging from 1/16-inch to 1/4-inch in 1/64-inch increments, providing you with a comprehensive selection to tackle any drilling project.

This set of 29 jobber length drill bits is made from high-quality material, High Speed Steel M35 (Cobalt 5%), which provides an extended tool life compared to ordinary drill bits when drilling hard materials. The M35 Cobalt High Speed Steel is particularly suitable for tough, high tensile strength materials, making it successful in cutting harden metals such as stainless steel, cast iron, high-temperature alloy, titanium alloy, hard plastics, and woods, as well as softer materials.

The drill bits have a 135° split point with a round straight shank, which makes them self-centering and prevents walking, ensuring precise and faster drilling. The fully ground twist design helps clear particles faster, decreases friction, and heat, resulting in a cooler drilling performance.

This set includes 29 pieces of jobber length drill bits in various sizes, ranging from 1/16" to 1/2" by 1/64" increments. With such a wide range of sizes, these drill bits are suitable for a variety of drilling needs.

The manufacturer offers a 100% satisfaction guarantee. If customers are not fully satisfied with the product for any reason, they can contact the manufacturer for a resolution.

Introducing the Stubby Mechanics Length Drill Bit – your ultimate tool for enhanced strength and efficiency! Designed with precision and durability in mind, this drill bit is a must-have addition to your toolkit.

Crafted from top-quality cobalt steel, this drill bit is built to withstand the toughest of tasks. Its premium construction ensures exceptional strength, allowing you to tackle even the most challenging drilling projects with ease. Whether you're a professional mechanic or a DIY enthusiast, this drill bit is guaranteed to deliver outstanding performance every time.

One of the standout features of this drill bit is its unique stubby mechanics length. This design allows for additional strength, making it perfect for heavy-duty applications. Say goodbye to flimsy and weak drill bits – this one is specifically engineered to handle the toughest materials and provide superior results.

But that's not all – this drill bit also boasts a left-hand stub configuration. This means it is specifically designed to remove right-hand threaded broken bolts or studs without the risk of tightening them further. With this innovative feature, you can easily tackle those stubborn bolts and studs that have caused you so much frustration in the past.

When it comes to versatility, this drill bit truly shines. Its compatibility with a wide range of drilling tools and machines makes it a versatile option for any project. Whether you're working with a drill press, hand drill, or any other power tool, this drill bit will seamlessly integrate and deliver exceptional results.

Investing in the Stubby Mechanics Length Drill Bit is a decision you won't regret. Its premium cobalt steel construction, enhanced strength, and left-hand stub design set it apart from the competition. Get ready to experience the convenience, efficiency, and reliability that this drill bit has to offer.

Upgrade your drilling experience today and equip yourself with the Stubby Mechanics Length Drill Bit – the ultimate tool for professionals and DIY enthusiasts alike. Don't settle for less when it comes to quality and performance. Choose a drill bit that is built to last and designed to excel – choose the Stubby Mechanics Length Drill Bit.

Introducing the CaRoller M35 Drill Bit Set – the ultimate solution for all your drilling needs! This 15-piece set offers a convenient size variety, ensuring that you have the perfect drill bit for any project. With sizes ranging from 1/16" to 3/8", you'll be equipped with the right tool for the job.

Designed with professionals in mind, the CaRoller M35 Drill Bit Set is a must-have for woodworkers, handymen, construction workers, and anyone who enjoys tackling house projects. No matter the task at hand, this set guarantees perfect holes and plugs every time.

What sets this drill bit set apart is its heavy-duty construction. Made with HSS cobalt durable material, these bits are built to withstand the test of time. Say goodbye to worn-out bits and hello to superior wear resistance.

But convenience doesn't stop there. The CaRoller M35 Drill Bit Set comes with a practical and portable cup-type round carrying case. This ergonomic case features a built-in clip, allowing you to easily attach it to your tool belt. No more searching for misplaced drill bits – with this set, your bits will always be within immediate reach.

Versatility is key when it comes to drilling, and this set delivers. With a 135-degree split point and round straight shank, these drill bits boast an intelligent self-centering design that prevents walking. Additionally, the fully ground twist design ensures cooler drilling performance by reducing friction. These cobalt drill bits can effortlessly tackle a wide variety of materials, including stainless steel, cast iron, high-temperature alloy, titanium alloy, hard plastics, and wood.

Invest in the CaRoller M35 Drill Bit Set and experience the difference for yourself. Whether you're a professional or a DIY enthusiast, this set will exceed your expectations. With its convenient size variety, heavy-duty construction, practical carrying case, and versatile functions, it's the perfect addition to any toolbox.

Upgrade your drilling experience and achieve flawless results with the CaRoller M35 Drill Bit Set.

Introducing the M35 Cobalt High Speed Steel Drill Bit Set by Amoolo. This industry-grade set is made from M35 high-speed steel, which is significantly harder than the HSS commonly used in other drill bit sets. These drill bits are enhanced with 5% Cobalt, increasing their wear-resistance and overall durability.

This complete combo set includes the 13 most commonly-used sizes for metal drilling: 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 11/64", 3/16", 13/64", 7/32", 15/64", and 1/4". These sizes are compatible with the majority of power drills available on the market. To ensure easy storage and organization, the set comes with a portable plastic case.

The M35 Cobalt Drill Bits are designed to deliver precise and efficient drilling performance. The fully ground spiral groove design effectively clears particles, reducing friction and heat. This results in faster and cooler drilling, extending the lifespan of the drill bits. The 135° split point with a round straight shank prevents walking and ensures precise and faster drilling. With these drill bits, there is no need for a center punch.

This versatile drill bit set is suitable for a wide range of applications. It is perfect for cutting through hard metals such as stainless steel, steel, sheet metal, and cast iron. Additionally, it can be used on materials like plastic, aluminum alloy, wood, and other softer metals. When using the M35 Cobalt Drill Bits, it is important to pay attention to speed, pressure, and heat control for optimal results.

At Amoolo, customer satisfaction is our top priority. That's why we offer a 90-day Hassle-Free Warranty Policy. If there are any defects with the product, we guarantee a hassle-free exchange or refund. Invest in the M35 Cobalt High Speed Steel Drill Bit Set today and experience the difference in performance and durability.

Introducing the Premium 6% Cobalt Steel Drill Bits, designed with the highest quality materials to bring you the utmost durability and long-lasting performance. With a Rockwell Hardness Scale of 69 HRC, these drill bits boast excellent heat, wear, and chip resistance, providing you with a tool that can handle even the toughest materials.

The cutting edge of the drill bits has been ground three times and is made of cobalt steel, which has high hardness and heat resistance. This design allows for efficient drilling through a variety of materials such as stainless steel, hardened steel, iron, aluminum, pipes, wood, PVC, and plastics.

These heavy-duty cobalt drill bits are typically capable of running two to three times faster than standard drill bits. Despite the higher price, the cost per hole when using cobalt drill bits will be the lowest because they can produce so many more holes.

Thanks to the sufficiently sharp bit edge, this drill bit can cut metal material into long strips of iron chips rather than slowly grinding through the material with a blunt drill bit. This results in a cleaner and more efficient drilling experience.

Included in this 17-piece kit are drill bit sizes ranging from 1/16 to 1/2 inches with a 135-degree cobalt industrial HSS design. This kit has everything you need for your drilling projects, whether you're a DIY enthusiast or a professional contractor.

Invest in the Premium 6% Cobalt Steel Drill Bits for reliable, high-performance drilling. With their durability, long life, and efficiency, these drill bits are a must-have addition to any toolbox or workshop.

Introducing the Premium Bright Finish Solid Carbide Drill Bits, a must-have for any high-speed drilling application. These drill bits are made from solid carbide, providing exceptional rigidity and heat resistance that surpasses traditional high-speed steel bits. With their superior cutting ability, these tungsten carbide (WC) bits can effortlessly cut through various metals, making them suitable for a wide range of industries including aerospace, precision machining, and hobby supply.

Designed with precision and efficiency in mind, these drill bits feature a 118° four facet point angle. This optimal design minimizes drill wander and ensures accurately sized holes every time. The jobber length and spiral flutes with a higher flute angle further enhance the performance of these bits by facilitating high feed rates and efficient chip disposal. The smooth finish on the bits also promotes excellent chip flow, allowing for a seamless drilling experience.

When it comes to durability and longevity, these carbide drills are in a league of their own. They stay sharp for a significantly longer period compared to traditional steel bits, making them ideal for even the toughest drilling tasks. Whether you're working with aircraft metals, chrome, titanium, inconel, stainless steel, alloys, low-medium-high carbon steel, aluminum, copper, glass, plastics, composite materials, or cast iron, these drill bits will get the job done with ease.

Let's talk specifications. The flute length of these drill bits is 1-3/8 inch, with an overall length of 2-1/2 inch. They are designed to accommodate a drill size of 5/32 inch. The tungsten carbide grade (ISO) is K20, and the binder metal is 8% cobalt. With a hardness rating of 91.3 HRa, these bits are incredibly tough and durable. It's important to note that these drill bits are uncoated, giving you the freedom to use them "wet" or "dry" depending on your specific drilling needs.

It's worth mentioning that tungsten carbide is a composite material, combining tungsten carbide powder with cobalt as a binder metal. This unique composition gives the material a ceramic-like quality, making it exceptionally hard and resistant to wear. In fact, tungsten carbide ranks 9 on the Mohs scale, just below diamond. However, it's important to handle these drill bits with care as their hardness also makes them brittle with minimal plasticity. Avoid unstable drilling to prevent any risk of breakage.

Introducing the Drill Bit Set, a comprehensive collection of 29 drill bits that will meet all your drilling needs. This set includes a wide range of sizes, from 1/16" to 1/2", ensuring that you have the right bit for any job.

The drill bits in this set are made from M35 cobalt, a high-performance material known for its exceptional strength and durability. These bits are specially designed to drill through rigid and high-tensile strength materials, making them perfect for cutting through tough metals like stainless steel, cast iron, and titanium alloys. But that's not all – they can also be used on softer materials like wood and plastics.

With a 135-degree point and twist design, these cobalt drill bits offer several advantages. First, they improve cutting speed, allowing you to work more efficiently. Second, they ensure self-centering, which means you'll have precise control over your drilling. Third, they prevent walking, so you can start drilling exactly where you want without any deviations. Finally, the 135-degree point helps to quickly clear debris and particles, keeping your work area clean and safe.

The HSS cobalt drill bits in this set are specifically designed for hardened steel, providing excellent cutting performance. The blades of these bits have been hardened and polished to enhance their sharpness and ensure precise cutting without any shaking. With 29 sets of drill bits included, you can rely on this set for a long time to come.

The drill bit set comes with a portable rose case, which is crafted with German precision and quality. Unlike traditional iron boxes, this rose case offers superior durability and a more appealing appearance. It also provides convenient storage and organization for your drill bits, keeping them secure and easily accessible. Furthermore, this drill set is compatible with most brands on the market, so you can trust in its reliability and versatility.

When it comes to customer satisfaction, we are committed to providing excellent quality and attentive service. If you have any questions or concerns, please don't hesitate to contact us. We are here to serve you wholeheartedly, ensuring that you have a positive experience with our drill bit set.