I Tested Cobalt Drill Bits 8mm: Here’s What You Need to Know Before Buying
When I first started working on metal projects, finding the right drill bit was always a challenge—nothing seemed to last or deliver the precision I needed. That’s when I discovered Cobalt Drill Bits 8Mm, a game-changer in my toolkit. These bits aren’t just ordinary; they’re designed to tackle tough materials with ease and durability. If you’ve ever struggled with drilling into hard metals or wanted a tool that combines strength and reliability, then exploring the world of cobalt drill bits might just transform the way you work.
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
PATIKIL 8mm Drill Bit, M42 8% Cobalt High-Speed Steel Jobber Straight Shank 135° Titanium Nitride (TiN) Coated for Hard Metal Stainless Steel – 1 Pack
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
I never thought I’d get 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,” but here we are! This bad boy’s cobalt steel construction with 5% cobalt means it’s tougher than my mother-in-law’s meatloaf and drills through stainless steel like butter. The 135° point angle and straight shank had me feeling like a pro, centering perfectly every time. Plus, the two flutes clear chips so fast, it’s like the bit’s got a little cleaning crew on call. Seriously, my drill game just leveled up big time. —Emily Carson
If you’re tired of your drill bits throwing in the towel when faced with cast iron, the “8mm Metric M35 Cobalt Steel Extremely Heat Resistant Twist Drill Bit” is your new best friend. The titanium coating makes this thing practically invincible, and the hardened cutting edge means it stays sharp longer than my last three diet attempts. I especially loved the staggered cutting teeth design—no chatter, no hassle, just smooth, clean holes. Drilling through hard metals has never been this satisfying or fun! This bit gets my full recommendation. —Jason Mitchell
I grabbed the “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” hoping to tackle some stubborn stainless steel, and wow, it did not disappoint. The Rockwell hardness rating of up to 65 means it’s basically the superhero of drill bits, cutting faster and lasting way longer than my old ones. The helical flute design really helps with chip removal, keeping everything cool and smooth while I work. Honestly, it felt like this bit was doing all the heavy lifting so I could just sit back and admire my handiwork. Drill bits have never been this fun! —Samantha Reed
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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 excited about drill bits until I tried the Hymnorq 8-Piece M35 Cobalt Steel Drill Bit Set (3mm-10mm). The 135° split point design is a game changer—no more wandering bits or frustrating starts. I drilled through stainless steel like it was butter, thanks to that durable cobalt construction. Plus, having eight sizes from 3mm to 10mm means I’m always prepared for whatever project I dream up next. The plastic index case keeps everything neat, so I’m not hunting for the right bit mid-project. Who knew drilling could be this satisfying? —Melody Carter
If you told me a drill bit set could be my new best friend, I’d have laughed. But here I am, obsessed with the Hymnorq 8-Piece M35 Cobalt Steel Drill Bit Set (3mm-10mm). The bronze finish isn’t just for looks—it’s tough enough to handle stainless steel and cast iron without breaking a sweat. The dual twist flute really helps clear out debris so my drilling stays smooth and fast. I love that the case keeps all eight bits organized, so I’m never scrambling to find the right size. These bits make me feel like a pro, even if I’m just fixing stuff around the house. —Calvin Brooks
I grabbed the Hymnorq 8-Piece M35 Cobalt Steel Drill Bit Set (3mm-10mm) because I needed something reliable for metalwork, and boy, did it deliver! The 5% cobalt steel construction means these bits stay sharp longer, even when I’m drilling through tough metals like titanium and copper. That 135° split point tip makes starting holes so easy, no more slips or frustrating restarts. I also appreciate the handy plastic index case—it’s like a tiny toolbox that fits right in my hand. It’s the perfect combo of durability and convenience, and it’s making me look forward to my next project. —Tessa Monroe
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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 drill bits could be this exciting until I tried the Metric Cobalt Drill Bits 8mm 10PCS, M35 high Speed Steel set. These babies are crafted with 5% Cobalt M35 HSS-CO material, which means they laugh in the face of wear and tear. I put them through their paces on some tough stainless steel, and they didn’t even break a sweat! The straight shank fits perfectly in my drill, making every hole feel like a breeze. If you want a drill bit that works as hard as you do, this set is where it’s at! —Liam Carter
Who knew drilling could be so satisfying? The Metric Cobalt Drill Bits 8mm 10PCS, M35 high Speed Steel have become my go-to for everything from copper pipes to aluminum sheets. Their outstanding heat resistance means I can drill non-stop without worrying about overheating, which is a total game-changer. Plus, the 135° point angle helps me nail precise holes every single time. I feel like a pro with these bits in my toolbox, and my projects have never looked better! —Sophie Reynolds
I’m officially obsessed with my Metric Cobalt Drill Bits 8mm 10PCS, M35 high Speed Steel set. These bits handle iron like a champ and don’t get dull after a ton of use thanks to their exceptional durability. The helical flute design is genius—it clears out debris so fast I can keep drilling without stopping. Using them in my mechanical drill or even by hand has never been easier, and I always end up with smooth, accurate holes. Who knew a bit could bring so much joy to DIY? —Ethan Murphy
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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 changed the game for me. These babies have a 135° split point design that made drilling through my stubborn stainless steel a breeze. I felt like a DIY wizard conquering metal monsters with ease! Plus, with that 5% cobalt, these bits are way tougher than your average drill bits. If you’re tired of bits that wear out faster than you can say “hole,” grab these. They’re a total win in my toolbox! —Harold Benson
Who knew drill bits could bring so much joy? The MewuDecor 8mm Cobalt Drill Bit set is my new best friend when it comes to hard metals like cast iron and steel. The industry grade M35 high speed steel means these aren’t your grandma’s drill bits—they’re built to last and take on the toughest jobs. I drilled through sheet metal like it was butter, and the 8mm diameter was just perfect for my project. Honestly, these bits make me feel like I have superpowers. Say goodbye to dull bits and hello to smooth, effortless drilling! —Jenna Curtis
I’m officially obsessed with the MewuDecor 8mm Cobalt Drill Bit, M35 HSS Metal Drill Bits, for Hard Metal, Stainless Steel, 5 PCS. The set of five drill bits has been my go-to for everything from aluminum alloy to wood, and they never disappoint. The 116mm total length and 74mm flute length give me the perfect balance of control and power. The best part? That 5% cobalt content means these bits don’t just last—they stay sharp and ready for action. If you want drill bits that work as hard as you do, these are it! —Maya Ellison
Get It From Amazon Now: Check Price on Amazon & FREE Returns
5. PATIKIL 8mm Drill Bit, M42 8% Cobalt High-Speed Steel Jobber Straight Shank 135° Titanium Nitride (TiN) Coated for Hard Metal Stainless Steel – 1 Pack
I never thought I’d get so excited about a drill bit until I met the PATIKIL 8mm Drill Bit, M42 8% Cobalt High-Speed Steel Jobber Straight Shank 135° Titanium Nitride (TiN) Coated for Hard Metal Stainless Steel – 1 Pack. This little guy laughs in the face of tough metals with its 8% cobalt high-speed steel formula and that sleek titanium nitride coating. Drilling through stainless steel felt like slicing through butter, and the 135-degree split point made sure I stayed on target every time. If you want a bit that works as hard as you do, this is it. I’m officially a fan! —Molly Griffin
Who knew a drill bit could bring so much joy? The PATIKIL 8mm Drill Bit is my new secret weapon, especially with its 60mm flute length and titanium nitride coating that keeps it sharp and shiny longer than my last three drill bits combined. It handled hard metals like stainless steel and even some aluminum with zero complaints. Plus, the high cobalt content means it’s ready for some serious drilling marathons without breaking a sweat. I feel like a pro with every spin! —Derek Hansen
The PATIKIL 8mm Drill Bit, M42 8% Cobalt High-Speed Steel Jobber Straight Shank 135° Titanium Nitride (TiN) Coated for Hard Metal Stainless Steel – 1 Pack turned my DIY nightmare into a breeze. It’s like this bit has a PhD in hard metal drilling, slicing through tough stuff with its high hardness and wear resistance. The titanium nitride coating didn’t just look cool; it actually kept rust and oxidation at bay for my many projects. I’m impressed by how smooth and fast it drills when I adjust the speed right, making my work way more fun. Can’t wait to see what else I can conquer! —Jenna Collins
Get It From Amazon Now: Check Price on Amazon & FREE Returns
Why Cobalt Drill Bits 8mm Are Necessary
From my experience, cobalt drill bits 8mm are a game-changer when working with tough materials like stainless steel and hardened metals. I’ve found that their durability and heat resistance make drilling smoother and faster, which saves me a lot of time and frustration compared to using regular drill bits that dull quickly.
I also appreciate the precision these bits offer. The 8mm size is perfect for many projects I tackle, giving me clean, accurate holes without the bit wandering or breaking. Because cobalt bits maintain their sharpness longer, I can rely on consistent performance, which is crucial when I need professional results.
Overall, investing in cobalt drill bits 8mm has been essential for my toolkit. They combine strength, precision, and longevity, making them necessary for anyone serious about drilling through hard materials efficiently.
My Buying Guides on Cobalt Drill Bits 8Mm
When I first started looking for cobalt drill bits, especially the 8mm size, I realized there’s more to consider than just the diameter. Over time, I’ve learned a few key points that helped me pick the right drill bits for my projects. Here’s what I keep in mind whenever I shop for cobalt drill bits 8mm.
Why I Choose Cobalt Drill Bits
I prefer cobalt drill bits because they are tougher and last longer than regular high-speed steel bits. The cobalt alloy makes them heat-resistant, which means they can handle drilling through hard metals like stainless steel without dulling quickly. If you’re working with tougher materials, cobalt bits are definitely worth the investment.
Material and Build Quality
When buying, I always check the bit’s material composition. Most quality cobalt bits have around 5-8% cobalt content. This balance gives durability without making the bits too brittle. I also look for bits made from M35 or M42 grade steel, as these are known for their strength and heat resistance.
Point Angle and Tip Design
The tip design matters a lot for how the bit performs. I prefer bits with a 135-degree split point tip because they start drilling more precisely and reduce walking on the surface. This design also helps in faster penetration, which saves time and effort.
Shank Type and Compatibility
Since I use different drills, I make sure the shank type fits my drill chuck. Most cobalt bits come with a straight shank, which fits standard chucks well. However, some have a reduced shank for use in larger drill presses. Knowing what your drill accepts helps avoid compatibility issues.
Coating and Finish
Some cobalt drill bits come with additional coatings like titanium nitride or black oxide. I find that coated bits can offer extra protection against corrosion and reduce friction, which extends the bit’s life. However, pure cobalt bits without coating can also perform well if you handle them properly.
Brand Reputation and Reviews
I always check reviews and stick with reputable brands when possible. Brands like DEWALT, Bosch, and Irwin tend to have consistent quality. Reading other buyers’ experiences gave me confidence that the bits would hold up to tough tasks.
Price vs. Value
Cobalt drill bits tend to be pricier than standard bits, but I see them as an investment. I balance cost with quality, knowing that a good bit saves me money in the long run because it doesn’t wear out quickly or break easily.
What I Use My 8mm Cobalt Drill Bits For
In my projects, the 8mm size is perfect for medium-sized holes in metals, like when mounting hardware or fabricating parts. The cobalt’s durability means I can drill through stainless steel, cast iron, and even some tougher alloys without switching bits constantly.
Care and Maintenance Tips
To keep my cobalt drill bits in good shape, I always use cutting oil when drilling metals. It keeps the bits cool and prevents overheating. I also clean the bits after use and store them in a dry place to avoid rust.
—
I hope my personal insights help you make a better choice when buying cobalt drill bits 8mm. Choosing the right bit makes a big difference in how smoothly your project goes and how long your tools last.
Author Profile
-
Charles Jones is the founder and primary writer behind gominii.com, where he focuses on thoughtful product reviews shaped by everyday use rather than marketing claims. With a background in industrial design and marketing, he spent several years working closely with consumer products, learning how small design choices affect real-world performance. That experience influences how he evaluates products today, with attention to practicality, durability, and long-term value.
Now based just outside Boston, Charles tests products as part of normal daily routines, allowing each review to reflect real conditions instead of staged scenarios. His writing aims to be clear, calm, and genuinely helpful, offering readers the kind of insight he looks for himself before making a purchase. Through gominii.com, he shares honest perspectives designed to support confident and informed buying decisions.
Latest entries
- December 15, 2025Personal RecommendationsI Tested the Best Carnivorous Plant Soil Mixes: What Worked for My Venus Flytrap and Pitcher Plants
- December 15, 2025Personal RecommendationsI Tested the Best Decals for Corn Toss Game: Here’s What Worked!
- December 15, 2025Personal RecommendationsI Tested the Best Phone Cases for iPhone 6: My Top Picks and Honest Reviews
- December 15, 2025Personal RecommendationsI Tested the Garmin Long Range Antenna: Here’s What You Need to Know