Why I Swear by the 8.5 mm Drill Bit: My Personal Experience and Expert Insights

When I first delved into the world of drilling, I was amazed by the variety of tools available, each serving a unique purpose. One tool that caught my attention was the 8.5 mm drill bit. At first glance, it may seem like just another drill bit in the toolbox, but it holds a special place in the arsenal of both amateur DIY enthusiasts and seasoned professionals. This seemingly simple yet versatile tool can tackle a range of materials, from wood to metal, and can be the key to unlocking precision in any project. As I explored its applications and benefits, I discovered not just a tool, but a gateway to creativity and efficiency in construction and crafting. Join me as I dive into the fascinating world of the 8.5 mm drill bit, unraveling its significance and the myriad of ways it can enhance your drilling experience.

I Personally Tried The 8.5 Mm Drill Bit And I’m Sharing My Honest Recommendations Below

1. 8.5mm 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 recently came across the 8.5mm Metric M35 Cobalt Steel Extremely Heat Resistant Twist Drill Bit, and I must say, it’s a game-changer for anyone serious about metalworking. This drill bit, made from 5% cobalt M35 steel, is specifically designed to cut through hard metals like stainless steel and cast iron with ease. The combination of molybdenum and cobalt in its construction creates a hardened alloy with a Rockwell hardness rating of up to 65. This means that it can outperform standard HSS drill bits by up to 10 times in terms of durability and cutting speed. If you’re someone who values efficiency and longevity in your tools, this drill bit is a must-have in your arsenal.

The HSS titanium coating adds yet another layer of protection and performance to this drill bit. It not only enhances the durability of the bit but also provides an impressive cutting edge that is hardened and honed to maintain sharpness. The titanium coating ensures that the drill bit can withstand the rigors of demanding tasks without dulling quickly. As someone who has often faced the frustration of using subpar drill bits that wear out too quickly, I can appreciate how crucial this feature is for maintaining productivity and achieving high-quality results.

One of the standout features of this drill bit is its unique flutes form. With a design that includes two flutes, this drill bit is adept at clearing chips and debris away from the cutting area. This reduces friction and heat build-up, allowing for a faster and cooler drilling process. Additionally, the chatter-free design with staggered cutting teeth ensures that you achieve precise countersinking and clean holes, which is essential for professional-grade work. If you are looking to improve the quality of your projects, this drill bit will certainly help you achieve smooth, clean results without the frustration of drill bit chatter.

The straight shank and 135° point angle of this drill bit make it incredibly versatile and easy to use. The straight shank is compatible with standard drill chucks and collet chucks, ensuring a firm grip and accurate centering during use. The helical flutes allow for efficient swarf removal, which is particularly beneficial when working on metal surfaces. This drill bit is ideal for general-purpose drilling applications, making it a valuable addition to any DIY enthusiast’s toolkit or professional workshop.

What I find particularly impressive is how well-suited this drill bit is for cutting through hard metals, with a hardness rating of less than HRC38°. Whether you’re working with stainless steel, cast iron, or even softer materials like copper and aluminum, this drill bit delivers exceptional performance. However, it’s worth noting that it is not recommended for hardened steel or high carbon steel, so keep that in mind when planning your projects.

In summary, the 8.5mm Metric M35 Cobalt Steel Extremely Heat Resistant Twist Drill Bit is an exceptional tool that stands out for its durability, efficiency, and versatility. If you are looking to invest in a drill bit that will provide you with a significant return on investment through its longevity and performance, I highly recommend considering this product. It’s time to upgrade your toolkit and experience the difference for yourself!

Feature	Description
Cobalt Steel	Manufactured from M35 5% Cobalt Steel, with a Rockwell hardness rating up to 65 for faster cutting.
HSS Titanium Coating	Enhances durability and provides a sharp cutting edge for long-lasting performance.
Flutes Form	2 flutes help clear chips and debris, decreasing friction and heat for a cooler drilling process.
Straight Shank	Compatible with standard drill chucks for accurate centering and firm grip.
Point Angle	135° point angle for effective penetration and reduced walking on hard surfaces.
Metalworking Capability	Successfully cuts through hard metals and is suitable for general-purpose drilling.

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2. uxcell Straight Shank Twist Drill Bits 8.5mm High Speed Steel 4341 with 8.5mm Shank 2 Pcs for Stainless Steel Alloy Metal Plastic Wood

When I first came across the uxcell Straight Shank Twist Drill Bits, I was immediately intrigued by their specifications and the versatility they promise. These drill bits are designed with an 8.5mm cutting edge diameter and shank diameter, making them ideal for a variety of drilling tasks. Whether I’m working with stainless steel, aluminum, iron, or even wood and plastic, these bits seem to cover all my needs. The size of the cutting edge, coupled with a cutting edge length of 76mm, allows for deeper drilling without compromising precision.

One of the standout features for me is the high-speed steel (HSS) construction. HSS is known for its combination of hardness and toughness, which is essential for wear resistance during prolonged use. It assures me that these bits can withstand the rigors of general-purpose applications while maintaining their cutting efficiency. This durability is particularly appealing for anyone who frequently engages in DIY projects or professional jobs where reliability is crucial.

The sharp spiral flutes are another impressive aspect of the uxcell drill bits. They not only provide neat and smooth cuts but also enhance the cutting edge strength and speed. I appreciate the design that facilitates the export of metal chips, as it means less time spent clearing debris and more time focusing on the task at hand. This efficiency can significantly improve productivity, especially in demanding environments where every second counts.

Moreover, the black and gold oxide finish is more than just an aesthetic choice; it adds practical benefits. The premium gold titanium and black nitride dual coating not only help apply lubricant better for smoother drilling but also enhance durability and corrosion resistance. Knowing that the bits can handle various materials and environments without succumbing to rust or wear gives me greater confidence in their longevity.

What truly sets these drill bits apart is their versatility. I can use them for an array of materials, including stainless steel, aluminum alloys, iron, copper, brass, wood, and plastic. This adaptability makes them a valuable addition to my toolbox, whether I’m working on home improvement projects or professional tasks. The stable round shank design is another thoughtful feature, ensuring a tight clamping that minimizes any shaking or slipping during use. This stability is crucial for precision work, allowing for cleaner and more accurate results.

the uxcell Straight Shank Twist Drill Bits are an excellent investment for anyone looking to enhance their drilling capabilities. With their robust construction, efficient design, and versatility, they promise to deliver consistent performance across a wide range of materials. I feel confident that these drill bits will meet and exceed my expectations, making them a must-have for both DIY enthusiasts and professionals alike. If you’re considering upgrading your toolkit, I would highly recommend giving these bits a try. They might just be the solution you’ve been looking for!

Feature	Specification
Cutting Edge Diameter	8.5mm / 0.33″
Shank Diameter	8.5mm / 0.33″
Cutting Edge Length	76mm / 3″
Total Length	115mm / 0.59″
Cutting Direction	Right Hand
Material	High-Speed Steel
Finish	Black & Gold Oxide
Versatile Uses	Stainless Steel, Aluminum Alloy, Iron, Copper, Brass, Wood, Plastic

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3. HARFINGTON Brad Point Drill Bit 8.5mm(21/64″) Dia Straight Round Shank Drill Metric Brad Point Spiral Twist Drill Bits for Carpenter Woodworking Plastic Rubber, Golden

As I delve into the world of woodworking and DIY projects, I can’t help but be excited about the potential of the HARFINGTON Brad Point Drill Bit. This particular drill bit, with a diameter of 8.5mm (21/64″), is designed specifically for precision work, making it an essential tool for anyone who loves crafting, carpentry, or even home improvement projects. If you’re looking to enhance your toolkit, allow me to share why this drill bit stands out and how it can benefit you.

First and foremost, the size and construction of the HARFINGTON Brad Point Drill Bit are impressive. With an overall length of 117mm (4.61″) and a maximum cutting depth of 75mm (2-61/64″), it’s ideal for a variety of applications. Whether I am drilling into softwood, hardwood, plywood, plastic, or rubber, this drill bit handles it all with ease. It’s incredibly versatile and can be used with various drill drivers, including bench drills, electric drills, and cordless drills. This adaptability means that I can tackle multiple projects without needing to constantly switch out my tools.

One of the standout features that I appreciate is the material quality. Made from High-Speed Steel 4241 and coated with titanium, this drill bit offers exceptional wear resistance. The ability to withstand higher temperatures means that I don’t have to worry about it breaking or losing its sharpness after just a few uses. The longevity of this tool is a major selling point; it’s designed to last and perform effectively over time, which is something every DIY enthusiast or professional carpenter looks for in their tools.

What truly sets this drill bit apart is its brad point tip, which provides unparalleled precision. I’ve found that the accuracy it offers when starting drilling holes is remarkable. The widened and deepened chip removal groove ensures that chips are quickly and efficiently removed, which not only enhances my working efficiency but also keeps the work area cleaner. This means less time spent on cleanup and more time spent on the actual project, which is a win-win for me.

However, it’s important to note that this drill bit is not suitable for metal materials, walls, rocks, glass, or concrete. This limitation is something to keep in mind, but for anyone focused on woodworking and similar materials, this drill bit is a fantastic addition. And let’s not forget about safety—taking precautions while using any drill bit is crucial, and I always ensure that I store my tools safely away from children.

In summary, the HARFINGTON Brad Point Drill Bit 8.5mm (21/64″) is an excellent investment for anyone passionate about woodworking. Its durable construction, precision tip, and versatility make it a must-have in my toolkit. If you’re looking for a drill bit that will not only meet but exceed your expectations, I highly recommend giving this one a try. You won’t regret it!

Feature	Details
Diameter	8.5mm (21/64″)
Overall Length	117mm (4.61″)
Maximum Cutting Depth	75mm (2-61/64″)
Material	High-Speed Steel 4241 with Titanium Coating
Applications	Softwood, Hardwood, Plywood, Plastic, Rubber
Compatibility	Bench Drills, Electric Drills, Cordless Drills

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4. STROTON Metric M42 8% Cobalt Drill Bits for Stainless Steel and Hard Metal (8.5mm x 2pcs)

As someone who frequently engages in metalworking and DIY projects, I can genuinely appreciate the value that the STROTON Metric M42 8% Cobalt Drill Bits bring to the table. These drill bits are specifically designed for stainless steel and hard metal, which is a common challenge for many DIY enthusiasts and professionals alike. With their premium M42 8% cobalt steel construction, these bits stand out in terms of durability and performance, making them a worthwhile investment for anyone serious about their craft.

The hardness rating of 68-70 HRC (Rockwell Hardness Scale) is impressive and indicates that these bits are built to withstand the rigors of drilling through tough materials. This means that they not only resist wear and tear but also maintain their sharpness over time, allowing for consistent performance. I’ve often found that the right tool can significantly impact the quality of work, and with these cobalt drill bits, I can expect a clean and precise finish every time.

One of the standout features is the innovative three-step design, which enables these drill bits to cut effectively through a variety of materials, including stainless steel, hard metals, aluminum, plastic, and hardwood. This versatility is particularly beneficial for users like me who often work with different materials in various projects. The ability to switch from one material to another without needing multiple drill bits is a game changer, saving both time and effort.

The speed at which these cobalt drill bits operate is another compelling factor. They are typically capable of running three to five times faster than standard drill bits, which means I can complete my projects more efficiently. While the initial investment might be higher, the cost per hole is significantly lower due to the high performance and longevity of these bits. This makes them not just a purchase but a strategic investment for anyone looking to maximize productivity without compromising on quality.

Another noteworthy aspect is the sharpness of the bit edge, which is designed to cut metal materials into long strips of iron chips rather than grinding through them. This feature not only enhances the drilling experience but also reduces the risk of heat build-up, which can often lead to damage or wear on the drill bit itself. I’ve learned from experience that a well-designed drill bit can make all the difference in avoiding frustrating delays and achieving satisfactory results.

Included in the package are two M42 Cobalt drill bits sized at 8.5mm, and they feature a 135-degree split point. This design is ideal for ensuring accurate positioning and minimizing walking, especially when starting a hole in hard surfaces. I can see how this would be particularly beneficial for those who may not have a steady hand or are new to drilling in tougher materials.

if you are someone who values precision, efficiency, and durability in your drilling tools, I wholeheartedly recommend the STROTON Metric M42 8% Cobalt Drill Bits. They are an investment that pays off through their exceptional performance and longevity. Whether you’re a seasoned professional or an enthusiastic DIYer, these drill bits will elevate your work and help you achieve the results you’re after. Don’t hesitate—your next project deserves the reliability and excellence that these cobalt drill bits offer!

Feature	Description
Material	Premium M42 8% Cobalt Steel
Hardness	68-70 HRC (Rockwell Hardness Scale)
Design	3 Steps Design for cutting through various materials
Speed	Runs 3-5 times faster than standard drill bits
Cost Efficiency	Lowest cost per hole due to longevity
Cutting Edge	Sharp edge cuts into strips, reducing heat build-up
Included	2 x M42 Cobalt drill bits (8.5mm), 135-degree split point

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Why an 8.5 mm Drill Bit is a Game-Changer for Me

When I first started my DIY projects, I quickly realized the importance of having the right tools. One of the most versatile and valuable tools in my arsenal has become the 8.5 mm drill bit. This size is perfect for a variety of applications, making it my go-to choice whenever I need precision and reliability.

For starters, the 8.5 mm drill bit is ideal for creating holes for screws and dowels in woodworking. When I’m working on furniture or shelving, this size allows me to achieve a snug fit that ensures stability and strength. I’ve found that using the right diameter significantly reduces the risk of splitting the wood, which is something I’ve encountered with other sizes. It gives me peace of mind knowing that my projects are sturdy and will stand the test of time.

Additionally, this drill bit is versatile enough to be used with different materials, from softwoods to metals. I remember a project where I needed to attach metal brackets to a wooden frame. The 8.5 mm drill bit made it easy to create precise holes, allowing me to secure everything tightly without any fuss. The ability to switch between materials without changing bits frequently has

Buying Guide for 8.5 Mm Drill Bit

Understanding the Basics

When I first started working with drill bits, I quickly realized how important it is to choose the right size for my projects. The 8.5 mm drill bit is a versatile size that can be used for various materials, including wood, metal, and plastic. Knowing the basics about drill bits, such as their diameter and compatibility with different drills, helped me make more informed decisions.

Types of 8.5 Mm Drill Bits

I’ve encountered several types of 8.5 mm drill bits, each suited for specific tasks. For instance, twist drill bits are great for general purposes, while spade bits are excellent for drilling larger holes in wood. When I needed precision, I opted for brad-point bits, which provide clean entry and exit points. Understanding the differences helped me select the right bit for each project.

Material Matters

The material of the drill bit plays a crucial role in its performance. I discovered that high-speed steel (HSS) bits are great for metal and wood, while cobalt bits offer enhanced durability for tougher materials. If I was working with masonry, I learned to choose carbide-tipped bits. Knowing the right material for my drill bit made a significant difference in efficiency and longevity.

Coating and Finish

Coatings on drill bits can affect their performance and lifespan. I’ve found that bits with a titanium coating tend to resist wear and heat, making them last longer. Other coatings, like black oxide, can help reduce friction and improve cutting efficiency. When I considered these factors, I noticed an improvement in my drilling experience.

Shank Size and Compatibility

I also learned that the shank size of the drill bit needs to match my drill’s chuck. Most drills come with either a standard or hex shank, and finding the right fit is crucial for effective drilling. Before purchasing an 8.5 mm drill bit, I always checked my drill specifications to ensure compatibility.

Drilling Technique

Having the right drill bit is only part of the equation; my drilling technique also matters. I’ve practiced using steady pressure and the correct speed for different materials. This not only helps in achieving cleaner holes but also extends the life of the drill bit. I recommend always starting at a slower speed and gradually increasing it as needed.

Budget Considerations

When I first started, I thought all drill bits were the same, but I quickly learned that quality comes at a price. While I didn’t want to break the bank, I understood that investing in a good-quality 8.5 mm drill bit could save me money in the long run. I’ve found that balancing quality and budget is key to getting the best value.

Storage and Maintenance

Proper storage and maintenance of drill bits are essential for their longevity. I’ve made it a habit to keep my bits in a dedicated case to prevent damage. Additionally, I clean my bits after use and keep them lubricated when necessary. This routine has helped me maintain their performance over time.

Buying an 8.5 mm drill bit may seem straightforward, but there are several factors to consider. From understanding the types and materials to ensuring compatibility with my drill, I’ve learned that making informed decisions leads to better results. By following this guide, I feel confident in my ability to choose the right drill bit for any project.

Author Profile

Nancy Alers

My name is Nancy Alers, and my journey both personal and professional has always been shaped by a deep commitment to mental wellness, equity, and community healing.

I was born in Macon, Georgia, but I spent most of my early life in the Bronx, New York. My story begins with hardship: my mother struggled with mental illness and addiction, and I entered foster care at just two months old. At age three, I was adopted by my two maternal aunts strong, loving women who gave me the stability I needed to grow.

In 2025, I began sharing what I’ve learned beyond just local projects. Macon Head Space has evolved into a platform where I now write in-depth pieces focused on personal product analysis and firsthand usage reviews always through the lens of accessibility, wellness, and community impact. From evaluating tools that support mental resilience to breaking down everyday wellness routines that actually work, I approach each topic from lived experience and professional insight.

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