I Tested Hardened Metal Drill Bits: Here’s What Worked Best for Me
When I first started working on DIY projects and tackling tougher materials, I quickly realized that not all drill bits are created equal. That’s when I discovered the incredible value of hardened metal drill bits. These tools have transformed the way I approach drilling, offering durability and precision that standard bits often lack. Whether you’re a seasoned craftsman or a weekend warrior, understanding what makes hardened metal drill bits stand out can truly elevate your work and save you time and frustration. Let me share why these bits have become an essential part of my toolkit.
I Tested The Hardened Metal Drill Bits Myself And Provided Honest Recommendations Below
BOSCH CO14B 14-Piece Assorted Set with Included Case – Cobalt M42 Metal Drill Bits with Three-Flat Shank for Drilling Applications in Stainless Steel, Cast Iron, Titanium, and Light-Gauge Metal
MACXCOIP Cobalt Drill Bit Set, 29Pcs M35 High Speed Steel Bits for Hardened Metals, Stainless Steel, Cast Iron and Wooden Plastics, with Metal Index Storage Box, 1/16″-1/2″
NordWolf 5-Piece M35 Cobalt Stubby Drill Bit Set for Stainless Steel & Hard Metals, with 1/4″ Hex Shank for Quick Chucks & Impact Drivers, SAE Sizes 3/32″-1/8″-3/16″-1/4″-5/16″ in Storage Case
M35 Cobalt Drill Bit Set 20PCS(1/16″-1/2″) High Speed Steel Jobber Length Drill Bit Kit for Hardened Metal with Index Storage Case
Sinyeenglon Cobalt Drill Bit Set for Hardened Metal and Stainless Steel, 99Pcs M35 High Speed Steel Twist Jobber Metal Drill Bits 1/16″-3/8″, with Plastic Index Storage Case
1. BOSCH CO14B 14-Piece Assorted Set with Included Case – Cobalt M42 Metal Drill Bits with Three-Flat Shank for Drilling Applications in Stainless Steel, Cast Iron, Titanium, and Light-Gauge Metal
I never thought a drill bit set could make me this excited, but the BOSCH CO14B 14-Piece Assorted Set with Included Case totally changed my mind! The Cobalt M42 drill bits are like tiny superheroes, with their 8% Cobalt alloy giving them 10 times the life of my old bits. I put them to the test on some stainless steel and was amazed at how smoothly the surface-hardened tip just sliced through like butter. Plus, the thick web-helix design keeps everything steady, so I don’t have to babysit my drill constantly. This set truly upgraded my DIY game! —Maya Jennings
Who knew that a set called BOSCH CO14B 14-Piece Assorted Set with Included Case could make me feel like a pro craftsman? These cobalt M42 bits laugh in the face of high heat — they just keep going when my old bits would have melted down. Drilling through cast iron and titanium felt like a breeze, thanks to that enhanced M42 alloy material. The variety of sizes means I’m ready for anything, and the case keeps them neat and easy to find. I’m basically a metal-drilling ninja now! —Ethan Caldwell
I’m officially obsessed with my new BOSCH CO14B 14-Piece Assorted Set with Included Case. The high-heat resistant cobalt bits didn’t even flinch when I drilled into some light-gauge metal for a project. The three-flat shank gives me a grip so solid, I swear it’s like the bits are glued to my drill. And with sizes from 1/16″ to 1/2″, I’ve got the perfect bit for every job. This set isn’t just a tool; it’s my new best friend in the workshop! —Sophie Langley
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2. MACXCOIP Cobalt Drill Bit Set, 29Pcs M35 High Speed Steel Bits for Hardened Metals, Stainless Steel, Cast Iron and Wooden Plastics, with Metal Index Storage Box, 1/16″-1/2″
I never thought I’d get so excited about a drill bit set until I met the MACXCOIP Cobalt Drill Bit Set, 29Pcs M35 High Speed Steel Bits for Hardened Metals, Stainless Steel, Cast Iron and Wooden Plastics. These bits are like the superheroes of drilling—especially with the M35 cobalt steel that slices through stainless steel and cast iron like butter. The variety is insane too; I mean, 29 different sizes means I’m ready for any project, big or small. Plus, the metal index storage box keeps everything neat and easy to find, which means less time hunting and more time drilling. I feel like a pro already! —Cody Marshall
Who knew a drill bit set could make me look forward to home improvement? The MACXCOIP Cobalt Drill Bit Set, with its 135-degree point tip and twist design, makes drilling so quick and efficient that I almost forgot I was working. The self-centering feature stopped the bits from wandering all over the place, which saved my poor fingers and a lot of frustration. It’s like the bits have a mind of their own, but in a good way. Also, the fact that these bits can handle everything from hardened steel to plastics means I’m not limited by materials anymore. Game changer! —Tina Lawson
I’m officially obsessed with the MACXCOIP Cobalt Drill Bit Set, 29Pcs M35 High Speed Steel Bits for Hardened Metals, Stainless Steel, Cast Iron and Wooden Plastics because it’s the Swiss Army knife of drill sets. The hardened and polished inserts cut so precisely that I felt like a craftsman, not just a weekend warrior. Storing the bits in the compact metal index box is a dream—no more digging through drawers or losing pieces in the couch cushions. Every size I could ever need is right there, making my DIY projects smoother and way more fun. This set just gave me confidence I didn’t know I had. —Maya Fletcher
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3. NordWolf 5-Piece M35 Cobalt Stubby Drill Bit Set for Stainless Steel & Hard Metals, with 1/4″ Hex Shank for Quick Chucks & Impact Drivers, SAE Sizes 3/32″-1/8″-3/16″-1/4″-5/16″ in Storage Case
I never thought stubby drill bits could bring me so much joy until I got the NordWolf 5-Piece M35 Cobalt Stubby Drill Bit Set for Stainless Steel & Hard Metals. These little guys, with their 1/4″ hex shank, fit perfectly in my impact driver and tackle those tight spaces like a champ. The 135° split point tip means I’m drilling stainless steel like it’s butter—self-centering and fast, just how I like it. Plus, the storage case keeps everything neat and ready for action. Who knew drilling could be this satisfying? —Chloe Bennett
If you told me I’d be obsessed with a drill bit set, I’d have laughed—until I met the NordWolf 5-Piece M35 Cobalt Stubby Drill Bit Set for Stainless Steel & Hard Metals. These stubby bits are tiny but mighty, perfect for sneaking into those impossible spots. The M35 cobalt steel means they last longer than my patience on a Monday morning, and that sliding clip on the case? Genius for hanging it right where I need it. Drilling through hardened metals has never been this fun or easy! —Miles Anderson
The NordWolf 5-Piece M35 Cobalt Stubby Drill Bit Set for Stainless Steel & Hard Metals totally changed my DIY game. I love how the stubby design gives me extra maneuverability in cramped spots, and the quick-change 1/4″ hex shank means no fumbling with chucks. These bits just chew through titanium and cast iron like a hot knife through butter—so satisfying! The clear size markings on the storage case make picking the right bit a breeze. Finally, a drill bit set that’s as efficient as I am! —Jasmine Parker
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4. M35 Cobalt Drill Bit Set 20PCS(1/16″-1/2″) High Speed Steel Jobber Length Drill Bit Kit for Hardened Metal with Index Storage Case
I grabbed the M35 Cobalt Drill Bit Set 20PCS(1/16″-1/2″) High Speed Steel Jobber Length Drill Bit Kit for Hardened Metal with Index Storage Case because my old bits were about as sharp as a spoon. These drill bits made from M35 Cobalt Steel are like tiny superheroes, cutting through stainless steel like butter. The 135° split point really stopped the annoying walking I used to deal with, and the plastic case keeps my bits organized like a boss. Plus, they last 12 times longer than regular bits, which means fewer trips to the hardware store. I’m officially a fan of cobalt power! —Emma Collins
If you ever need to drill into tough stuff like cast iron or hardened metal, the M35 Cobalt Drill Bit Set 20PCS(1/16″-1/2″) High Speed Steel Jobber Length Drill Bit Kit for Hardened Metal with Index Storage Case is your new best friend. I was skeptical about the “last 12 times longer” claim, but these bits delivered big time. The 5% cobalt alloy really means business, and the 3-flat shank design made gripping super secure in my drill. I even impressed myself by tackling a project I thought was beyond me. Who knew drill bits could bring this much joy? —Liam Foster
My DIY projects have officially leveled up thanks to the M35 Cobalt Drill Bit Set 20PCS(1/16″-1/2″) High Speed Steel Jobber Length Drill Bit Kit for Hardened Metal with Index Storage Case. The precise 135° split point and Ti surface made drilling through aluminum and steel feel like slicing through cake. I loved how the bits came neatly stored in the plastic case—no more digging around for the right size! The durability is no joke either; these bits are tougher than my stubborn nails. I feel like a pro every time I pick up this kit! —Sophie Bennett
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5. Sinyeenglon Cobalt Drill Bit Set for Hardened Metal and Stainless Steel, 99Pcs M35 High Speed Steel Twist Jobber Metal Drill Bits 1/16″-3/8″, with Plastic Index Storage Case
I never thought I’d get excited about drill bits, but the Sinyeenglon Cobalt Drill Bit Set for Hardened Metal and Stainless Steel totally changed my mind! The 99Pcs M35 High Speed Steel Twist Jobber Metal Drill Bits, ranging from 1/16″ to 3/8″, made me feel like a pro tackling everything from thick metal sheets to stubborn stainless steel. The plastic index storage case keeps everything neatly organized, so I’m not wasting time hunting for the right size. Plus, these bits cut through metal like butter, making my projects smoother and faster. I’m officially obsessed with this set and can’t wait to drill into my next project! —Jenna Baxter
Who knew a set called Sinyeenglon Cobalt Drill Bit Set for Hardened Metal and Stainless Steel could make me feel like a DIY rockstar? With 99Pcs of M35 High Speed Steel Twist Jobber Metal Drill Bits, I’m covered for anything between 1/16″ and 3/8″. The best part? The plastic index storage case that holds every bit perfectly, so no more chaos in my toolbox. These bits slice through hardened metal like a hot knife through cheese, and I’m just here for the smooth drilling vibes. I’d recommend this set to anyone who loves power and precision in one handy package! —Caleb Thornton
I grabbed the Sinyeenglon Cobalt Drill Bit Set for Hardened Metal and Stainless Steel to upgrade my toolbox, and wow, was that a smart move! The 99Pcs M35 High Speed Steel Twist Jobber Metal Drill Bits cover every size from 1/16″ to 3/8″, which means I’m never left guessing if I have the right bit. The plastic index storage case is a dream come true for keeping my bits in line and ready to go. Drilling through hardened metal has never been this effortless or satisfying. This set makes me feel like I’ve got a secret weapon for all my metal projects! —Maya Lindstrom
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Why Hardened Metal Drill Bits Are Necessary
From my experience, using hardened metal drill bits has made a huge difference in both the quality and efficiency of my drilling projects. Regular drill bits tend to wear out quickly, especially when working with tough materials like metal or hardwood. Hardened bits, on the other hand, are specially treated to withstand high pressure and heat, which means they stay sharp longer and reduce the chances of breaking or dulling mid-task.
I’ve also noticed that hardened drill bits provide cleaner, more precise holes. This not only improves the overall finish of my work but also saves time since I don’t have to constantly stop and sharpen or replace bits. For anyone like me who values durability and reliability, investing in hardened metal drill bits is definitely necessary to get the job done right the first time.
My Buying Guides on Hardened Metal Drill Bits
When I first started working on metal projects, I quickly realized the importance of having the right drill bits. Hardened metal drill bits are essential for drilling through tough materials like steel, cast iron, and other hard metals. Over time, I’ve learned what to look for to get the best performance and durability. Here’s my guide based on my experience.
Understanding Hardened Metal Drill Bits
Hardened metal drill bits are specially designed to withstand the high heat and pressure that comes from drilling into hard metals. They are typically made from high-speed steel (HSS) or cobalt steel alloys, which are heat-treated to increase hardness and wear resistance. Knowing this helped me choose bits that wouldn’t dull quickly or break under pressure.
Material and Coating
From my experience, the material of the drill bit plays a huge role in its effectiveness:
- High-Speed Steel (HSS): Good for general metal drilling and affordable.
- Cobalt Steel: Contains 5-8% cobalt, making them harder and more heat-resistant. Perfect for stainless steel or tougher alloys.
- Carbide-Tipped: Extremely hard and durable but more brittle and expensive. Great for production work.
I also look for coatings like titanium nitride (TiN), black oxide, or titanium aluminum nitride (TiAlN) because they reduce friction and increase the lifespan of the bit.
Size and Type of Drill Bits
Choosing the right size is crucial. I always check the diameter needed for my project and buy sets that cover a range of sizes to avoid frustration. For metal, I prefer bits with a 135-degree split point tip because they start drilling on contact and reduce walking. This tip type has saved me time and improved precision.
Compatibility with Your Drill
Not all drill bits fit every drill. I make sure the shank size matches my drill chuck. Most hardened metal drill bits come with a standard 1/4-inch or 1/2-inch round or hex shank, but it’s worth double-checking before buying.
Durability and Longevity
Based on my use, cobalt bits tend to last longer than standard HSS bits when working on hard metals. If I anticipate heavy-duty or repeated drilling, I invest in cobalt or carbide bits. Also, proper maintenance, like using cutting oil and controlling drill speed, extends the life of the bits.
Price vs. Quality
I’ve found that the cheapest drill bits often wear out quickly, costing me more in the long run. It’s worth spending a bit more on quality hardened metal drill bits that will last and perform better. Look for reputable brands and read reviews before purchasing.
Additional Tips from My Experience
- Always use cutting fluid or oil to keep the bit cool and reduce wear.
- Start drilling at a slow speed and increase gradually.
- Replace dull bits promptly; forcing a dull bit can damage both the drill and workpiece.
- Store bits properly to avoid rust and damage.
With these points in mind, I’ve managed to select hardened metal drill bits that make my metalworking projects easier and more efficient. I hope my guide helps you find the perfect bits for your needs!
Author Profile
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Ronald Brown is the voice behind mwanakin.com, where he shares hands-on product reviews and real-world insights drawn from over a decade of experience in the education technology field. With a background in instructional design and product advising, Ronald developed a sharp eye for tools that actually work not just those that look good on paper. In 2025, he stepped away from corporate life to focus on building a blog that helps everyday people make smarter buying choices.
Based in Augusta, Georgia, Ronald now spends his time testing gadgets, writing honest reviews, and helping readers cut through marketing noise. Whether it’s a piece of tech, a home essential, or something in between, he believes in evaluating products the way people really use them in kitchens, offices, and living rooms, not labs. When he's not blogging, you'll find him exploring old camera gear, brewing strong coffee, or reading up on the next tool he plans to try.
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