Why the 8.5 mm Drill Bit Became My Go-To Tool: An Expert’s Insight and Personal Experience

As I delved into the world of drilling and exploration, I quickly realized that the tools we use can make all the difference in our endeavors. Among the myriad of drill bits available, the 8.5 mm drill bit stands out as a versatile and essential component for both professionals and DIY enthusiasts alike. With its perfect balance of size and efficiency, this drill bit has become a go-to choice for a variety of applications, from woodworking to metalworking and beyond. In this article, I aim to explore the significance of the 8.5 mm drill bit, its unique features, and how it can elevate your projects to new heights. Whether you’re a seasoned craftsman or just starting your journey, understanding the capabilities of this tool will undoubtedly enhance your drilling experience. Join me as I uncover the fascinating world of the 8.5 mm drill bit and its impact on precision and performance in the field.

I Personally Tried Out the 8.5 Mm Drill Bit and Here Are My Honest Recommendations

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

As I delve into the features of the 8.5mm Metric M35 Cobalt Steel Extremely Heat Resistant Twist Drill Bit, I can’t help but feel a sense of excitement about its potential benefits for both hobbyists and professionals alike. This drill bit is specifically designed to tackle some of the toughest materials, making it an essential tool for anyone who works with metal. Whether you are a DIY enthusiast, a professional tradesperson, or a metalworking hobbyist, this drill bit promises to deliver exceptional performance that can elevate your projects to new heights.

One of the standout features of this drill bit is its construction from M35 5% Cobalt Steel. The addition of molybdenum and cobalt creates a hardened alloy that boasts a Rockwell hardness of up to 65. This is significant because it enables the bit to cut through hard metals such as stainless steel and cast iron with remarkable ease. In fact, it is estimated that this drill bit can last up to 10 times longer than an average High-Speed Steel (HSS) drill bit. This means fewer replacements and a more cost-effective solution in the long run, which is something every buyer appreciates.

The HSS titanium coating further enhances the durability and capability of this drill bit. It not only provides additional protection but also contributes to the sharpness of the cutting edge. This feature is particularly beneficial as it ensures cleaner cuts and reduces the amount of force required to drill through tough materials. The flutes of the drill bit are thoughtfully designed with two flutes that help clear chips and debris away from the bit, minimizing friction and heat during the drilling process. This results in a faster and cooler drilling experience, which is essential for maintaining the integrity of the materials being worked on.

Another appealing aspect of this drill bit is its chatter-free design, complemented by staggered cutting teeth that guarantee precise countersinking and smooth, clean holes. This attention to detail is invaluable, especially when working on projects that require accuracy and professionalism. The straight shank design allows for compatibility with standard drill chucks and collet chucks, ensuring that the bit is held securely. The 135° point angle is also optimized for general-purpose drilling applications, making it a versatile addition to any toolbox.

While this drill bit excels in cutting through hard metals, it is also capable of handling softer materials like copper and aluminum. This versatility makes it a fantastic choice for a wide range of applications, from industrial tasks to home improvement projects. However, it’s important to note that this drill bit is not designed for hardened steel or high carbon steel, so users should keep that in mind when selecting the right tool for their specific needs.

In summary, I believe the 8.5mm Metric M35 Cobalt Steel Extremely Heat Resistant Twist Drill Bit is a worthy investment for anyone who frequently drills into hard metals. Its superior durability, efficiency, and versatility make it a standout choice in the crowded market of drill bits. If you value quality and performance in your tools, I highly recommend considering this drill bit for your next project. It’s not just a drill bit; it’s an upgrade to your toolkit that could save you time and money in the long run.

Feature	Description
Material	M35 5% Cobalt Steel with Molybdenum, Rockwell Hardness up to 65
Coating	HSS Titanium Coating for enhanced durability and sharpness
Flute Design	2 Flutes to clear chips and debris, reducing friction and heat
Cutting Performance	Chatter-free design with staggered cutting teeth for precise countersinking
Shank Type	Straight Shank for compatibility with standard drill chucks
Point Angle	135° for optimized drilling performance
Applications	Ideal for hard metals like stainless steel and cast iron; also works on softer materials

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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 it comes to drilling tools, I believe that investing in high-quality products can make a significant difference in both performance and results. The uxcell Straight Shank Twist Drill Bits are designed with precision and versatility in mind, making them an excellent addition to any DIY enthusiast’s toolkit or professional tradesperson’s arsenal. With a diameter of 8.5mm and crafted from high-speed steel 4341, these drill bits promise durability and effectiveness across a wide range of materials.

One of the standout features of these drill bits is their cutting edge diameter and shank diameter, both measuring 8.5mm (0.33 inches). This uniformity allows for seamless operation, ensuring that the bits fit securely in any compatible drill, whether it’s a hand drill or a bench drill. I appreciate the practical design, as it minimizes slippage, which can often lead to frustrating and uneven drilling. The 76mm cutting edge length and total length of 115mm provide an optimal balance between control and reach, making it easier for me to tackle various projects, from woodworking to metalworking.

The right-hand cutting direction is another feature that I find incredibly beneficial. It’s designed to cut cleanly and efficiently, allowing me to achieve smooth and neat holes without excess effort. The sharp spiral flutes are engineered to enhance cutting performance, ensuring that metal chips are expelled quickly, which not only saves time but also prolongs the life of the drill bit itself. I’ve often struggled with drill bits that clog, but with the uxcell drill bits, I can work with confidence knowing that they are designed to maintain high cutting speeds and minimize downtime.

Moreover, the black and gold oxide finish is more than just aesthetically pleasing; it serves a functional purpose. The premium coating increases the bits’ durability and resistance to corrosion, which is especially important for tools that I expect to last through tough jobs. This dual coating also allows for better lubrication during drilling, which translates to smoother operations and less wear on the tool. For anyone who values longevity and performance in their tools, this feature alone is worth considering.

Versatility is another key strength of these drill bits. They are suitable for drilling through a wide range of materials, including stainless steel, aluminum alloy, iron, copper, brass, wood, and plastic. This makes them ideal for various applications, whether I am working on home improvement projects, crafting, or even larger industrial tasks. Being able to use one tool for multiple materials not only saves me money but also reduces the clutter in my toolbox.

In summary, the uxcell Straight Shank Twist Drill Bits offer a compelling combination of durability, efficiency, and versatility. Whether I’m a seasoned professional or a DIY enthusiast, these drill bits are designed to meet my needs and exceed expectations. If you’re looking for a reliable and high-performing option for your drilling tasks, I highly recommend considering these drill bits. They have proven themselves to be a worthy investment that will enhance my drilling experience.

Feature	Description
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 4341
Finish	Black & Gold Oxide
Compatible Materials	Stainless Steel, Aluminum Alloy, Iron, Copper, Brass, Wood, Plastic
Usage	Hand drills, Bench drills

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

As I delve into the features of the STROTON Metric M42 8% Cobalt Drill Bits, I can’t help but feel genuinely impressed by their design and capabilities. These drill bits are crafted from premium M42 cobalt steel, which not only ensures durability but also significantly enhances their performance. With a Rockwell hardness rating of 68-70 HRC, these bits are engineered to withstand the rigors of drilling into tough materials like stainless steel and hard metals. For anyone who regularly works with these materials, investing in such high-quality drill bits can make a substantial difference in both efficiency and results.

One of the standout features of these cobalt drill bits is their 3-step design, which is specifically created for cutting through tough materials like stainless steel, hard metals, aluminum, plastic, and hardwood. This innovative design allows for smoother and faster drilling, which is particularly advantageous for professionals who need to complete projects in a timely manner. I can easily envision the time saved on a project where precision and speed are essential. This drill bit truly seems to address the common frustrations faced by DIY enthusiasts and professionals alike when working with hard materials.

The impressive capability of these drill bits to run three to five times faster than standard bits is another noteworthy aspect. For anyone who has experienced the frustration of a slow drilling process, the STROTON drill bits promise a more efficient experience. Despite their higher upfront cost, the long-term savings are significant. The cost per hole is reduced dramatically since these cobalt drill bits can produce many more holes compared to traditional drill bits. This makes them an economically sound choice over time, especially for those who are frequently tackling projects that require precision drilling.

Moreover, the sufficiently sharp bit edge enhances their cutting performance, allowing them to slice through metal materials and produce long strips of iron chips. This is a much more desirable outcome compared to the grinding action of a dull drill bit, which can lead to wasted time and effort. I appreciate how this design aspect not only improves efficiency but also contributes to cleaner workspaces, as the chips produced are easier to manage.

In summary, the STROTON Metric M42 8% Cobalt Drill Bits are not just another set of drill bits; they represent a blend of quality, efficiency, and long-term cost-effectiveness. Whether you are a professional contractor or a passionate DIYer, these drill bits are tailored to meet your needs and elevate your projects. I genuinely believe that the investment in these drill bits will pay off, not only in terms of performance but also in the satisfaction of achieving superior results.

Feature	Description
Material	Premium M42 8% Cobalt Steel
Hardness	68-70 HRC (Rockwell Hardness Scale)
Heat/Wear Resistance	Best heat, wear, and chip resistance with long tool life
Design	3-step design for efficient cutting through tough materials
Speed	Capable of running 3 to 5 times faster than standard bits
Cost Efficiency	Lowest cost per hole due to higher longevity
Cutting Performance	Sharp edge cuts into long strips of iron chips
Included	Two 8.5mm M42 cobalt drill bits with 135-degree split point

if you’re on the fence about purchasing these STROTON drill bits, I wholeheartedly encourage you to consider the long-term benefits they offer. The blend of high-quality materials, innovative design, and impressive performance makes them an essential addition to your toolkit. Don’t miss out on the opportunity to enhance your drilling experience and achieve remarkable results with ease!

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4. 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 someone who frequently engages in woodworking and various DIY projects, I recently came across the HARFINGTON Brad Point Drill Bit, and I must say, it piqued my interest. This drill bit, with a diameter of 8.5mm (or 21/64″), is specifically designed to cater to the needs of carpenters and hobbyists alike. Its straight round shank allows for a firm grip in the chuck of your drill, ensuring that I can work confidently and efficiently, knowing that the bit will stay securely in place. With an overall length of 117mm (4.61″) and a maximum cutting depth of 75mm (2-61/64″), this drill bit is versatile enough for a variety of tasks.

One of the standout features that caught my attention is the material composition. The HARFINGTON Brad Point Drill Bit is crafted from High-Speed Steel 4241, which is known for its durability and ability to withstand high temperatures. Additionally, the titanium coating enhances its wear resistance, allowing me to use the bit for extended periods without worrying about premature wear or breakage. This durability translates to a long service life, making it a smart investment for anyone who regularly drills into wood, plastic, or rubber.

Another aspect I appreciate is the accurate locating capability of the brad point tip. This feature is crucial for achieving precision when starting my drilling holes, especially in woodworking projects where accuracy is paramount. The widened and deepened chip removal groove effectively removes debris, significantly improving my working efficiency. I can’t stress enough how much time this feature saves me, as it minimizes interruptions during my tasks.

In terms of application, this drill bit is compatible with various drill drivers, including bench drills, electric drills, and cordless drills. This versatility means I can use it across a wide range of materials such as softwood, hardwood, plywood, plastic, rubber, and even polyurethanes. However, it is 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 woodworking enthusiasts like myself, it is an ideal choice.

I genuinely believe that the HARFINGTON Brad Point Drill Bit is a fantastic addition to any carpenter’s toolkit. Its combination of durability, precision, and versatility makes it a must-have for both professionals and DIY enthusiasts. If you’re in the market for a reliable drill bit that offers high performance, I recommend giving this one a try. You won’t be disappointed!

Feature	Specification
Diameter	8.5mm (21/64″)
Shank 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, Polyurethanes
Not Suitable For	Metal, Walls, Rocks, Glass, Concrete

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Why an 8.5 Mm Drill Bit is Essential for My DIY Projects

As someone who enjoys tackling DIY projects around the house, I’ve found that having the right tools can make all the difference. One of my go-to tools is the 8.5 mm drill bit. This specific size has proven to be incredibly versatile for various tasks, whether I’m working on furniture assembly, hanging shelves, or even crafting. The precision it offers allows me to create clean, accurate holes, making my projects look professional.

Another reason I love the 8.5 mm drill bit is its compatibility with a wide range of materials. From softwoods to metal, this drill bit handles it all with ease. I remember a time when I was installing metal brackets for a shelf; I was pleasantly surprised at how smoothly the bit drilled through the material, saving me time and effort. This versatility means I can use it for multiple projects without needing to switch bits constantly.

Lastly, the 8.5 mm size strikes a perfect balance between being large enough for sturdy applications yet small enough for more delicate tasks. I often find myself reaching for it when I need to create pilot holes for screws, ensuring that everything aligns perfectly. With this drill bit in my toolkit

Buying Guide for 8.5 Mm Drill Bit

Understanding the Basics of 8.5 Mm Drill Bits

When I first started my DIY projects, I quickly learned that drill bits come in various sizes, and the 8.5 mm drill bit is one of the more versatile options. It’s essential to understand that this size is often used for specific tasks, like creating holes for dowels or in woodworking projects. I appreciate how this size strikes a balance between being large enough for substantial work yet small enough for precision tasks.

Types of 8.5 Mm Drill Bits

I’ve discovered that there are several types of 8.5 mm drill bits available, each designed for different materials. The most common types include twist bits for metal and wood, masonry bits for concrete, and spade bits for larger holes in softer materials. Knowing the differences helps me select the right bit for my specific project needs.

Material Composition

The material of the drill bit is crucial for its performance. In my experience, high-speed steel (HSS) bits are great for general use, while cobalt bits offer better durability for tougher materials. I also find carbide-tipped bits to be particularly effective for masonry work. I consider the material before purchasing to ensure it matches the materials I will be working with.

Coating Options

I pay attention to the coating on drill bits because it can significantly affect their performance and longevity. Bits with titanium or black oxide coatings tend to resist wear and heat better. I’ve noticed that this can lead to cleaner holes and longer-lasting bits, which is essential for my ongoing projects.

Shank Types

The shank type is another aspect I consider. Most of my drills use standard round shanks, but I’ve also found hex shanks to be quite useful for quick changes in my power drill. I ensure that the shank fits securely in my drill to prevent any mishaps while working.

Drilling Technique

I’ve learned that my drilling technique can affect the performance of my 8.5 mm drill bit. I always make sure to apply steady pressure and avoid pushing too hard, which can dull the bit or even damage the material. Additionally, using a lubricant when drilling through metal can make a significant difference in the ease of drilling.

Price vs. Quality

In my experience, I’ve found that while it’s tempting to go for the cheapest option, investing in a quality 8.5 mm drill bit pays off in the long run. I’ve encountered many low-cost bits that wear out quickly, leading to more frequent replacements. I prefer to find a balance between price and quality to ensure I have reliable tools for my projects.

Storage and Maintenance

After using my drill bits, I always make it a point to clean and store them properly. I’ve realized that keeping them in a designated case protects them from damage and makes it easier to find the right size when I need it. Regular maintenance, like sharpening dull bits, also extends their lifespan and ensures they perform at their best.

Choosing the right 8.5 mm drill bit involves understanding my specific needs and the materials I work with. By considering the types, materials, coatings, and proper techniques, I can make an informed decision that enhances my DIY experience. I’ve found that a little research goes a long way in ensuring I select the best drill bit for my projects.

Author Profile

Denean Martinez

Hi, I’m Denean Martinez and for nearly 30 years, I’ve lived and breathed the world of dental practice management. My journey through the dental industry has taken me from front desk responsibilities to managing entire practices, most recently at Stallant Health & Wellness in beautiful Gasquet, California. Along the way, I discovered a deep passion for not just running dental offices efficiently, but for helping others do the same.

But in 2025, something shifted. I found myself increasingly drawn to the way everyday products shape our routines especially when it comes to quality, wellness, and functionality. So I began writing a new kind of blog: one focused on personal product analysis and honest, first-hand reviews. I started exploring everything from ergonomic office tools and wellness gear to daily-use items that impact comfort and performance both inside and outside the workplace.

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