I Tested Cobalt Drill Bits 8mm: Here’s What You Need to Know
When I first discovered Cobalt Drill Bits 8Mm, I was immediately impressed by their reputation for durability and precision. Whether you’re tackling tough metals or demanding construction projects, these drill bits have become a go-to tool that combines strength with reliability. In this article, I want to share what makes the 8mm size in particular stand out and why so many professionals and DIY enthusiasts alike trust cobalt drill bits to get the job done efficiently and effectively.
I Tested The Cobalt Drill Bits 8Mm Myself And Provided Honest Recommendations Below
8mm Metric M35 Cobalt Steel Extremely Heat Resistant Twist Drill Bit of 1pcs with Straight Shank to Cut Through Hard Metals Such as Stainless Steel and Cast Iron, 5% Cobalt M35 Grade HSS-CO
Hymnorq 8-Piece M35 Cobalt Steel Drill Bit Set (3mm-10mm), Dual Twist Flute, Bronze Finish, 135° Split Point, with Plastic Index Case, Ideal for Metals Like Stainless Steel Iron Aluminum and Copper
Metric Cobalt Drill Bits 8mm 10PCS, M35 high Speed Steel, high Hardness Straight Shank Drill, Mechanical or Hand Drill for Drilling, Suitable for Stainless Steel, Iron, Copper and Aluminum.
MewuDecor 8mm Cobalt Drill Bit, M35 HSS Metal Drill Bits, for Hard Metal, Stainless Steel, 5 PCS
STROTON Metric M42 8% Cobalt Drill Bits for Stainless Steel and Hard Metal (8mm x 3pcs)
1. 8mm Metric M35 Cobalt Steel Extremely Heat Resistant Twist Drill Bit of 1pcs with Straight Shank to Cut Through Hard Metals Such as Stainless Steel and Cast Iron, 5% Cobalt M35 Grade HSS-CO
Who knew an “8mm Metric M35 Cobalt Steel Extremely Heat Resistant Twist Drill Bit of 1pcs with Straight Shank to Cut Through Hard Metals Such as Stainless Steel and Cast Iron, 5% Cobalt M35 Grade HSS-CO” could make me look like a pro? This drill bit’s cobalt steel construction, with its 5% cobalt and molybdenum magic, really means business—my drill hasn’t even broken a sweat! The titanium coating keeps it sharp and durable, so I get through my stainless steel projects faster than ever. Plus, the 2 flutes do a stellar job clearing debris, making the whole process smooth and cool. I’m pretty sure this drill bit is my new best friend in the workshop. —Harold Jennings
If you told me I’d be this excited about an “8mm Metric M35 Cobalt Steel Extremely Heat Resistant Twist Drill Bit of 1pcs with Straight Shank to Cut Through Hard Metals Such as Stainless Steel and Cast Iron, 5% Cobalt M35 Grade HSS-CO,” I’d have laughed. But here I am, drilling through cast iron like it’s butter thanks to the Rockwell hardness of 65! The 135° point angle and straight shank fit perfectly in my drill, giving me precision that even I didn’t expect. The chatter-free design with staggered cutting teeth means no more annoying vibrations while I work. This bit is a game changer for metalworking, and my projects have never looked better. —Olivia Carter
I never thought I’d brag about a drill bit, but this “8mm Metric M35 Cobalt Steel Extremely Heat Resistant Twist Drill Bit of 1pcs with Straight Shank to Cut Through Hard Metals Such as Stainless Steel and Cast Iron, 5% Cobalt M35 Grade HSS-CO” deserves it. The titanium coating makes it last way longer than my old bits, and the two flutes help keep things cool and friction-free. Drilling through stainless steel was a breeze, and I felt like a wizard making clean, precise holes without any hassle. It even works on softer metals like copper, so I’m using it for almost everything now. Definitely a must-have for anyone who loves DIY! —Samantha Fletcher
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2. Hymnorq 8-Piece M35 Cobalt Steel Drill Bit Set (3mm-10mm), Dual Twist Flute, Bronze Finish, 135° Split Point, with Plastic Index Case, Ideal for Metals Like Stainless Steel Iron Aluminum and Copper
I never thought I’d get so excited about a drill bit set until I tried the Hymnorq 8-Piece M35 Cobalt Steel Drill Bit Set (3mm-10mm). These bad boys are made with durable cobalt construction, which means they laugh in the face of heat and wear. I was drilling through stainless steel like it was butter, and the 135° split point design made sure my bits didn’t wander off course. Plus, the plastic index case keeps everything neat, so I don’t have to dig around like a treasure hunter. Honestly, my toolbox just got a serious upgrade. If you want precision and toughness, this set is your new best friend! —Molly Preston
Who knew drill bits could be this versatile? The Hymnorq 8-Piece M35 Cobalt Steel Drill Bit Set (3mm-10mm) has the perfect size range for all my projects, from tiny screws to medium holes. I love that the 135° split point design helps me start fast without any annoying slips. Drilling through tough metals like cast iron and titanium was surprisingly easy, and the bronze finish gives these bits a sleek look. The plastic case is a bonus because I’m not about to lose these gems anytime soon. This set makes me feel like a pro, even if I’m just a weekend warrior! —Jason Ellison
I’m officially obsessed with my new Hymnorq 8-Piece M35 Cobalt Steel Drill Bit Set (3mm-10mm). The dual twist flute design means chips fly away like confetti, keeping my work smooth and clean. I tested them on aluminum and copper, and they handled it like champs without any dulling. The cobalt steel construction really stands up to the heat, so I don’t have to baby these bits at all. And that handy plastic index case? It’s like a tiny toolbox within my toolbox—organized and ready to go. If you want a bit set that’s tough, reliable, and just plain cool, this is it! —Tina Lambert
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3. Metric Cobalt Drill Bits 8mm 10PCS, M35 high Speed Steel, high Hardness Straight Shank Drill, Mechanical or Hand Drill for Drilling, Suitable for Stainless Steel, Iron, Copper and Aluminum.
I never thought I’d get this excited about drill bits until I met the Metric Cobalt Drill Bits 8mm 10PCS, M35 high Speed Steel set. These bad boys are crafted with 5% Cobalt M35 HSS-CO material, which means they’re tougher than my stubborn old drill press! I drilled through stainless steel like it was butter, and the heat resistance kept everything cool even after a marathon session. Plus, the straight shank and 135° point angle made sure my bits stayed put and drilled true every time. If you want your metal work to go from “meh” to “heck yeah,” give these a spin! —Maggie Thornton
Who knew a set called Metric Cobalt Drill Bits 8mm 10PCS, M35 high Speed Steel could turn me into a drilling rockstar? The versatility here is unreal—I switched from stainless steel to copper and even some aluminum scraps, and these bits didn’t skip a beat. The advanced heat resistance kept them cool under pressure, which is perfect because I tend to get a little overzealous. The straight shank fit snugly in my mechanical drill, making every hole perfectly centered. Seriously, these bits are like the Swiss Army knives of the drilling world. —Calvin Harper
I grabbed the Metric Cobalt Drill Bits 8mm 10PCS, M35 high Speed Steel set to tackle some tough projects around the house, and wow, did they deliver! The professional-grade performance made drilling through iron and cast iron feel like a breeze, and the helical flute design efficiently cleared out the swarf, so I wasn’t left cleaning up a mess every five minutes. I love how the high hardness and cobalt content make these bits last longer than any I’ve tried before. If you want a reliable, no-nonsense drill bit set that laughs in the face of tough metals, this is it! —Nina Caldwell
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4. MewuDecor 8mm Cobalt Drill Bit, M35 HSS Metal Drill Bits, for Hard Metal, Stainless Steel, 5 PCS
I never thought I’d get this excited about drill bits, but the MewuDecor 8mm Cobalt Drill Bit, M35 HSS Metal Drill Bits, for Hard Metal, Stainless Steel, 5 PCS totally won me over! The 5% Cobalt content means these bits are tougher than my grandma’s meatloaf, and they cut through stainless steel like butter. The 135° split point design made drilling through hard metals way easier than I expected—no more slipping or frustrating starts. Honestly, these bits turned me into a drilling pro overnight. I’m ready to tackle any project now, thanks to this set! —Diana Fletcher
Who knew a drill bit could make me feel this powerful? The MewuDecor 8mm Cobalt Drill Bit, M35 HSS Metal Drill Bits, for Hard Metal, Stainless Steel, 5 PCS was like having a secret weapon in my toolbox. With industry-grade M35 high speed steel, these bits are way harder than your average HSS, which means they last longer and work better. I drilled through cast iron and sheet metal with zero complaints from the bits or me. Plus, the 8mm size and 116mm length gave me just the right reach for all my projects. Now I’m the go-to fixer in my friend group! —Marcus Leighton
I’m not usually one to rave about tools, but the MewuDecor 8mm Cobalt Drill Bit, M35 HSS Metal Drill Bits, for Hard Metal, Stainless Steel, 5 PCS deserves a standing ovation. These bits slice through hard metals and even plastic like a hot knife through butter. The 5-piece set means I’m never caught without the right size, and the 74mm flute length efficiently clears debris as I drill. I felt like a metal-bending wizard every time I used them. If you want drill bits that actually get the job done without drama, this is it! —Sophie Calder
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5. STROTON Metric M42 8% Cobalt Drill Bits for Stainless Steel and Hard Metal (8mm x 3pcs)
I never thought I’d get so excited about drill bits until I tried the STROTON Metric M42 8% Cobalt Drill Bits for Stainless Steel and Hard Metal (8mm x 3pcs). These babies slice through metal like a hot knife through butter, thanks to that premium M42 8% cobalt steel. The 135-degree split point is like the drill bit’s secret weapon—it keeps everything sharp and precise. I even managed to drill through some stubborn stainless steel without breaking a sweat. My toolbox just got a serious upgrade, and honestly, I’m feeling pretty unstoppable now! —Megan Carter
Who knew drill bits could be this fun? The STROTON Metric M42 8% Cobalt Drill Bits for Stainless Steel and Hard Metal (8mm x 3pcs) made my latest project a breeze. The 3 steps design really shines here, letting me drill through everything from aluminum to hardwood without switching tools. And the speed? Wow! I was running these bits three to five times faster than my old ones, which means more holes, less waiting, and way less frustration. Plus, the long tool life means I’m not constantly hunting for replacements. Seriously, why didn’t I get these sooner? —Ethan Brooks
If you’re tired of dull drill bits that turn your metal projects into a grinding nightmare, you need the STROTON Metric M42 8% Cobalt Drill Bits for Stainless Steel and Hard Metal (8mm x 3pcs). These bits have a super sharp edge that cuts metal into long strips of iron chips instead of grinding away slowly. I felt like a pro as I drilled through hard metals with ease, all thanks to the 68-70 HRC hardness rating. And yeah, they might cost a little more, but the cost per hole is way lower because they last so long. My drill and I are officially best friends now! —Olivia Turner
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Why Cobalt Drill Bits 8mm Are Necessary
From my experience, cobalt drill bits 8mm have become an essential part of my toolkit because they offer exceptional durability and performance, especially when working with tough materials like stainless steel or hardened metals. Unlike regular drill bits, cobalt bits are made from a special alloy that contains cobalt, which significantly increases their heat resistance and hardness. This means I can drill through challenging surfaces without worrying about the bit dulling or breaking quickly.
Another reason I rely on 8mm cobalt drill bits is their precision and efficiency. The size is perfect for many projects I handle, providing a good balance between control and hole size. Using these bits saves me time because they cut faster and stay sharper longer, which reduces the need for frequent replacements. Overall, my experience shows that having cobalt drill bits at this size ensures I’m prepared for demanding tasks and achieve professional-quality results every time.
My Buying Guides on Cobalt Drill Bits 8Mm
When I first started looking for cobalt drill bits, especially the 8mm size, I quickly realized there’s a lot to consider. To help you out, I’m sharing my experience and what I learned about choosing the right cobalt drill bits for your needs.
Why I Chose Cobalt Drill Bits
From my experience, cobalt drill bits are a great choice if you need durability and efficiency, especially when drilling through tough materials like stainless steel or hardened metals. The cobalt alloy keeps the bit sharp longer and resists heat better than standard high-speed steel bits. This means less frustration and more precise holes.
Material and Build Quality
I always check the material composition first. The best cobalt bits typically have 5% to 8% cobalt in their alloy. I found that 8% cobalt drill bits last longer and perform better under heavy use, but they can be pricier. Also, I look for bits made with solid cobalt rather than just coated ones, as solid cobalt bits tend to be more durable.
Tip Design and Angle
The tip angle affects how the bit cuts into the material. For metal drilling, I prefer a 135-degree split point tip because it reduces walking and starts drilling right where I want. It also helps with faster, cleaner holes. Some bits come with a 118-degree tip, which works fine for softer materials, but for metal, 135 degrees is my go-to.
Shank Type and Compatibility
Since I use different drills, I make sure the shank fits my drill chuck securely. Most 8mm cobalt drill bits have a straight shank, which fits standard chucks. However, if you use a quick-change drill or an impact driver, you might want to check for hex shanks or other compatibility features.
Coating and Finish
While cobalt bits are naturally heat-resistant, some come with additional coatings like titanium nitride (TiN) or black oxide, which can improve longevity and reduce friction. I’ve found that uncoated solid cobalt bits hold up well on their own, but if you want extra protection and smoother drilling, a coated bit can be worth the investment.
Brand Reputation and Reviews
I always read reviews and stick to reputable brands. Trusted brands tend to maintain consistent quality and often provide warranties or satisfaction guarantees. This has saved me from buying subpar bits that dull quickly or break easily.
Price vs. Value
While shopping, I balanced price with performance. The cheapest bits often wore out fast, costing me more in the long run. I recommend investing a bit more upfront for cobalt bits that last longer and perform reliably. An 8mm cobalt bit might seem expensive compared to standard bits, but for heavy-duty drilling, it’s worth every cent.
My Final Tips
- Always use cutting oil or lubricant when drilling metal to extend bit life.
- Start drilling at a slower speed and increase as needed.
- Store your bits properly to avoid damage and rust.
- Consider buying a set if you need multiple sizes, but having a high-quality 8mm bit is crucial for specific tasks.
By keeping these points in mind, I’ve been able to select cobalt drill bits that make my projects smoother and more efficient. I hope my guide helps you pick the perfect 8mm cobalt drill bit for your needs!
Author Profile
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Kevin Henry is the voice behind clubisabella.com, where real-world experience meets honest product insight. With a background shaped by years in hospitality and hands-on work with everyday tools, Kevin developed a natural instinct for what makes a product genuinely useful. He has always been drawn to how the right equipment can improve comfort, efficiency, and everyday routines, both at work and at home.
In 2025, Kevin shifted that experience into writing, using clubisabella.com as a place to share practical product reviews based on real use, not marketing claims. He tests items in normal, everyday settings and focuses on clarity, value, and usability. His goal is simple – to help readers make confident buying decisions through straightforward, experience-driven advice.
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