Ever tried drilling through stainless steel with a regular drill bit? You quickly realize you’re not just making a hole; you’re entering a battle of wills, ending with a dull bit and a lot of frustration. We’ve all been there! Whether you’re a seasoned pro tackling a demanding metalworking project or a DIY enthusiast upgrading your home, having the right tools makes all the difference. That’s why we’ve put together this comprehensive guide to help you find the best cobalt steel jobber drill bits for your needs.
Choosing the right drill bits can feel overwhelming with so many options on the market. This guide is here to simplify the process. We’ll delve into the features that set top-performing cobalt bits apart, helping you understand the importance of things like flute design, point geometry, and overall construction. We’ll provide detailed reviews of some of the best cobalt steel jobber drill bits available, along with a handy buying guide to help you make an informed decision.
We will review the best cobalt steel jobber drill bits later in this article. But before that, take a look at some relevant products on Amazon:
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Why Cobalt Steel Jobber Drill Bits Are Your Secret Weapon
Ever been there, wrestling with a stubborn piece of stainless steel, your regular drill bit screaming in protest and barely making a dent? We’ve all been there, staring down a project that feels like it’s fighting back every step of the way. That’s where the right tool can make all the difference, and for metalworking, especially with harder materials, the answer often lies in the world of cobalt steel jobber drill bits. These aren’t your run-of-the-mill drill bits; they’re built for the tough stuff.
The secret? Cobalt. Adding cobalt to the steel alloy gives these bits exceptional heat resistance. This is crucial because drilling generates friction, and friction equals heat, which can quickly ruin a standard high-speed steel (HSS) bit. Cobalt bits maintain their hardness at much higher temperatures, allowing you to drill faster, longer, and more effectively through materials like stainless steel, cast iron, and even some hardened alloys. In fact, some studies show that cobalt steel drill bits can last up to 10 times longer than standard HSS bits when used on hardened steel!
Now, the term “jobber” simply refers to the standard length of the drill bit, making them versatile for a wide range of applications. So when we talk about the best cobalt steel jobber drill bits, we’re talking about finding the sweet spot of durability, performance, and versatility for your everyday drilling needs. They’re the workhorses of the metal shop, ready to tackle everything from simple repairs to complex fabrication projects.
Choosing the right drill bits can feel overwhelming, but fear not! This guide is here to help you navigate the world of cobalt steel jobber drill bits and find the perfect set to add to your toolbox. We’ll break down the key features to look for, compare some of the top brands on the market, and give you the knowledge you need to conquer those tough drilling tasks with confidence. Get ready to unlock a new level of drilling performance!
The Best Cobalt Steel Jobber Drill Bits
Viking Drill and Tool Ultra Bor Super Premium
These bits are the real deal. If you’re tired of chewing through cheap drill bits like they’re candy, prepare to be amazed. The Viking Ultra Bor bits are crafted from M42 cobalt high-speed steel, which is like giving your drill bit a superhero suit. They laugh in the face of hardened steel, stainless, and even cast iron. You’ll get clean, precise holes with minimal walking, and the edge retention is just outstanding.
But quality comes at a price, and these bits are definitely an investment. However, if you’re a professional or a serious DIYer who demands the best performance and longevity, the Viking Ultra Bor bits are worth every penny. They’ll save you time, frustration, and money in the long run by not having to replace them constantly. Plus, the gold oxide finish looks pretty darn cool.
Irwin Cobalt M-42 Metal Drill Bit Set
Looking for a solid all-around set that won’t break the bank? The Irwin Cobalt M-42 set might be your sweet spot. These bits strike a nice balance between performance and affordability. Made from M42 cobalt steel, they offer significantly better heat resistance and durability compared to standard high-speed steel bits. This means they’ll last longer and can handle tougher materials with greater ease.
The set comes with a decent variety of sizes, making it suitable for a wide range of projects. While they might not be quite as aggressive as the top-tier Viking bits, they’re still a significant upgrade over cheaper options. If you need a reliable set of cobalt drill bits for general-purpose metal drilling without emptying your wallet, the Irwin Cobalt M-42 set is a solid choice.
Milwaukee Cobalt RED HELIX Drill Bit Set
These bits are a force to be reckoned with. Milwaukee’s RED HELIX design is more than just a fancy name; it actually works! The variable helix flute geometry aggressively removes chips, keeping the bit cooler and preventing binding. This means faster drilling and less wear and tear on both the bit and your drill. Plus, the innovative tip design starts on contact and helps prevent walking.
While the Milwaukee Cobalt RED HELIX bits may not be quite as heat-resistant as some of the M42 options out there, they more than make up for it with their speed and efficiency. They’re a great choice for professionals and DIYers who need to drill a lot of holes quickly and accurately. Just be prepared for them to cut through metal like a hot knife through butter!
Drill Hog USA Cobalt Drill Bit Set
Want something tough and American-made? The Drill Hog USA Cobalt Drill Bit Set might be just what you’re looking for. These bits are proudly made in the USA and built to withstand serious abuse. They’re made from M42 cobalt steel and feature a split point tip for easy starting and reduced walking.
Drill Hog is known for its no-nonsense, heavy-duty tools, and these drill bits are no exception. They’re designed for professionals who demand the best and aren’t afraid to put their tools to the test. While they might be a bit pricier than some of the other options on the list, you’re paying for quality craftsmanship and materials. If you want to support American manufacturing and get a set of drill bits that will last a lifetime, the Drill Hog USA Cobalt Drill Bit Set is a worthy investment.
Craftsman Cobalt Drill Bit Set
Don’t underestimate the Craftsman name when it comes to cobalt drill bits. This set is a great option for DIYers and homeowners who need a versatile and reliable set without breaking the bank. While they might not be the absolute top-of-the-line in terms of performance, they offer a solid balance of quality and affordability.
Craftsman’s Cobalt Drill Bit Set is made from a durable cobalt steel alloy that provides excellent heat resistance and wear resistance. This means they’ll last longer than standard high-speed steel bits and can handle tougher materials like stainless steel and cast iron with ease. The set comes with a variety of sizes, making it suitable for a wide range of projects around the house. If you’re looking for a dependable set of cobalt drill bits that won’t let you down, the Craftsman Cobalt Drill Bit Set is a great choice.
Why You Need Cobalt Steel Jobber Drill Bits
Ever tried drilling through stainless steel and ended up with a dull, smoking drill bit that’s barely made a scratch? Or perhaps you’re working on a DIY project involving hardened steel, and your standard high-speed steel bits are simply not cutting it (literally!). Frustration is an understatement, right? That’s where cobalt steel jobber drill bits come in, offering a solution for those materials that are tough to penetrate. They’re designed for applications where heat and abrasion are significant factors.
Imagine you’re building a custom roll cage for your off-road vehicle. You need to drill through thick-walled steel tubing, and regular bits would quickly become useless. Investing in a set of the best cobalt steel jobber drill bits will allow you to breeze through the project with precision and efficiency. These bits hold their edge longer, resisting the heat buildup that causes other drill bits to fail. You’ll save time, money (by not replacing broken bits), and your sanity!
Cobalt steel bits are not just for hardcore metalworkers, though. Think about fixing a stripped bolt on your lawnmower, requiring you to drill it out. A standard bit might struggle, risking damage to the engine block. A quality cobalt steel bit will grip and cut through the hardened steel bolt with minimal effort, giving you a clean, professional result. They’re also perfect for drilling through cast iron, which can be incredibly abrasive.
Ultimately, investing in cobalt steel jobber drill bits is an investment in the longevity of your tools and the success of your projects. They’re the go-to choice when you need a drill bit that can handle tough materials and high temperatures, ensuring clean, precise holes every time. Save yourself the headache of broken bits and frustrating projects by having a set on hand – you’ll thank yourself later.
Cobalt Steel vs. High-Speed Steel: Understanding the Difference
Think of your drill bits like tiny superheroes, each with their own special power. High-Speed Steel (HSS) is your everyday hero, good for general drilling in wood, plastic, and softer metals. It’s reliable and affordable, the kind of drill bit you keep in bulk for routine tasks. But when you need to drill through something tougher, like stainless steel or hardened alloys, HSS starts to falter. Imagine trying to cut through a metal pipe with a butter knife – that’s HSS against hard materials.
Cobalt steel drill bits, on the other hand, are the super-powered versions. They contain a higher percentage of cobalt, which makes them significantly harder and more heat-resistant. This extra hardness allows them to cut through tougher materials with ease, and the heat resistance means they won’t dull as quickly under pressure. Think of them as having adamantium claws, ready to slice through anything.
The difference really comes down to application. If you’re just drilling pilot holes in softwood, HSS is perfectly adequate. But if you’re working on a car repair project where you need to drill out a rusted bolt, or fabricating something with stainless steel, cobalt steel is the only way to go. Using HSS in these situations will just lead to frustration, broken bits, and wasted time.
Ultimately, choosing between cobalt steel and HSS depends on the types of materials you typically work with. Consider your project needs and the hardness of the material you’ll be drilling. Investing in a set of cobalt steel bits might seem like a bigger upfront cost, but their longevity and performance will save you money and hassle in the long run, especially if you regularly work with challenging materials.
Proper Usage and Maintenance for Longevity
Just like any tool, cobalt steel drill bits require a bit of TLC to keep them performing at their best. Using them correctly and maintaining them properly will significantly extend their lifespan and save you money in the long run. One of the most common mistakes is using too much speed. Cobalt steel bits are designed to cut slowly and deliberately. High speeds generate excessive heat, which can quickly dull the cutting edges.
Think of it like this: imagine trying to cut a thick steak with a dull knife. You’d likely saw at it aggressively, generating a lot of friction and making the job harder. The same principle applies to drilling. Start with a low speed and gradually increase it until you achieve a smooth, consistent cut. Let the bit do the work, and avoid forcing it.
Proper lubrication is also crucial. Applying cutting oil or fluid helps to reduce friction and dissipate heat, preventing the bit from overheating and dulling. Think of it as giving your drill bit a refreshing drink while it works hard. Lubrication also helps to flush away chips, preventing them from clogging the flutes and hindering the cutting action.
Finally, always store your cobalt steel drill bits in a protective case or organizer. This prevents them from being damaged or dulled by contact with other tools. Think of it as giving them a cozy home to rest in between missions. By following these simple tips, you can keep your cobalt steel drill bits in top condition and ensure they’re always ready to tackle your toughest drilling challenges.
Drill Bit Size Charts and Choosing the Right Bit
Ever found yourself staring blankly at a collection of drill bits, wondering which one is the right size for the job? It’s a common dilemma, especially when you’re dealing with fractional, number, and letter sizes. Understanding drill bit size charts is essential for accurate and efficient drilling, especially when you’re working with specific fasteners or creating precise holes.
A drill bit size chart is essentially a handy reference guide that translates these different sizing systems into decimal equivalents. Imagine you need to drill a hole for a #6 screw. Instead of guessing, you can consult a chart to find the corresponding drill bit size, which is typically around 0.140 inches. This ensures a perfect fit and prevents you from stripping the screw threads or creating a hole that’s too large.
The type of project you are working on also affects the drill bit size you choose. For example, if you’re drilling a pilot hole for a wood screw, you’ll want a bit that is slightly smaller than the screw’s shank (the smooth part of the screw). This allows the screw to grip the wood properly without splitting it. On the other hand, if you’re drilling a clearance hole for a bolt, you’ll need a bit that is slightly larger than the bolt’s diameter to allow it to pass through freely.
When in doubt, it’s always better to start with a slightly smaller drill bit and gradually increase the size until you achieve the desired result. This prevents you from accidentally drilling a hole that is too large, which can be difficult or impossible to fix. Keep a drill bit size chart handy in your workshop, and you’ll never have to guess again. This simple tool can save you time, frustration, and wasted materials.
Deburring and Hole Finishing Techniques
So you’ve successfully drilled your hole, but the job isn’t quite done yet. Often, drilling leaves behind burrs – those sharp, jagged edges around the hole’s perimeter. These burrs not only look unsightly, but they can also be a safety hazard, especially if you’re working with metal. That’s where deburring and hole finishing techniques come in.
Deburring is the process of removing these sharp edges to create a smooth, clean finish. There are several ways to deburr a hole, depending on the material and the desired level of precision. A simple deburring tool, which looks like a small hand-held reamer, is perfect for quick and easy deburring on most materials. For larger holes or more precise work, you can use a countersink bit in your drill or drill press.
Think of deburring as smoothing out the rough edges of a beautifully crafted piece. Just like a woodworker sands a piece of furniture to create a smooth, tactile surface, deburring creates a polished, professional look for your drilled holes. It ensures that the hole is safe to handle and that any fasteners or components that pass through the hole will fit properly.
Beyond deburring, you might also want to consider other hole finishing techniques, such as chamfering or countersinking. Chamfering creates a beveled edge on the hole, which can improve the appearance and prevent chipping or cracking. Countersinking creates a conical recess that allows a screw head to sit flush with the surface of the material. These finishing touches add a level of refinement to your work and demonstrate attention to detail.
Choosing the Best Cobalt Steel Jobber Drill Bits: A Buyer’s Guide
Hey there! So, you’re looking for some new drill bits, huh? Specifically, you’re after the best cobalt steel jobber drill bits. Well, you’ve come to the right place! Choosing drill bits can feel like navigating a minefield of options, but don’t worry, I’m here to help you sift through the noise and find the perfect set for your needs. This guide will walk you through the key considerations so you can make a confident purchase and tackle your drilling projects with ease. Let’s dive in!
1. Cobalt Content: How Much is Enough?
Think of cobalt as the secret sauce that elevates a regular drill bit into a high-performance workhorse. Cobalt is added to the steel alloy to increase its heat resistance and hardness. This is super important because when you’re drilling into hard materials like stainless steel or cast iron, friction generates a lot of heat. A bit without sufficient cobalt will quickly dull, leading to frustration and wasted effort.
So, how much cobalt do you really need? Generally, a cobalt content of 5% to 8% is considered ideal for jobber drill bits. This provides a good balance of hardness and toughness, making the bits capable of handling demanding tasks without being too brittle and prone to snapping. While some manufacturers may offer bits with even higher cobalt content, the marginal improvement in performance might not justify the increased cost for most DIYers and even some professionals.
2. Drill Bit Size and Set Variety: Finding Your Sweet Spot
Before you even think about the steel, consider the range of sizes you’ll need. Are you a generalist tackling a wide variety of projects, or do you tend to work with specific materials and hole sizes? If you’re a generalist, a comprehensive set with a wide range of sizes (perhaps from 1/16″ to 1/2″ in 1/64″ increments) might be the best option. This gives you the versatility to handle almost any drilling task that comes your way.
On the other hand, if you mostly drill the same few sizes, it might be more economical to buy individual bits in those specific sizes. This approach can save you money and prevent you from accumulating a bunch of bits you’ll never use. Also consider if you need metric sizes, or a set that combines both metric and standard. Think about your past projects, future plans, and where your “sweet spot” for drilling typically lies, so you can pick the most effective set.
3. Coating: Is It Just a Pretty Face?
While the underlying steel is the star of the show, the coating on a drill bit can play a supporting role. Common coatings include titanium nitride (TiN), titanium aluminum nitride (TiAlN), and black oxide. TiN coatings are known for their hardness and abrasion resistance, extending the life of the bit and allowing it to cut more smoothly. TiAlN coatings offer even better heat resistance, making them suitable for drilling at higher speeds and feeds.
Black oxide coatings, on the other hand, are more about corrosion resistance and reducing friction. They’re less expensive than TiN or TiAlN, but they don’t offer the same level of wear protection. So, if you’re primarily drilling softer materials or want to prioritize cost-effectiveness, black oxide might be a good choice. But for demanding applications, investing in a bit with a more advanced coating will definitely pay off in the long run.
4. Flute Design: How Does It Clear the Chips?
The flutes are the spiral grooves that run along the length of the drill bit. They’re responsible for channeling away the chips (the shavings of material created during drilling). An efficient flute design is crucial for preventing the bit from overheating and binding, leading to a smoother and more efficient drilling experience.
Look for bits with well-defined flutes that are deep and wide enough to effectively remove chips. Some bits feature a “parabolic” flute design, which is specifically engineered to improve chip evacuation and reduce the risk of clogging. The more efficiently the flutes clear the chips, the faster you can drill and the longer your bits will last. Think of the flutes as the exhaust system of your drill bit – you want them to be as clear and free-flowing as possible!
5. Point Angle: Matching the Bit to the Material
The point angle of a drill bit is the angle formed by the two cutting edges at the tip. Different point angles are optimized for different materials. A steeper angle, like 135 degrees, is ideal for drilling hard materials like steel and stainless steel. The steeper angle provides a more aggressive cutting action and reduces the tendency of the bit to “walk” or wander on the surface.
A shallower angle, like 118 degrees, is better suited for softer materials like wood and plastic. The shallower angle provides a smoother cut and reduces the risk of splintering or cracking the material. Most jobber drill bits come with a 135-degree split point, making them versatile enough for a wide range of applications. So, if you plan on drilling a variety of materials, a 135-degree split point is a great all-around choice when searching for the best cobalt steel jobber drill bits.
6. Brand Reputation and Warranty: Peace of Mind Matters
In the world of drill bits, brand reputation matters. Established brands often have a track record of producing high-quality, durable bits that perform consistently. Reading reviews and comparing brands can provide valuable insights into the reliability and performance of different options. Don’t be afraid to do your research and see what other users are saying about their experiences.
Also, check if the drill bits come with a warranty. A warranty can provide peace of mind, knowing that you’re protected against defects in materials or workmanship. Even the best cobalt steel jobber drill bits can have a manufacturing defect. A reputable brand is more likely to stand behind their products and offer a replacement or refund if you encounter any issues. It’s always better to be safe than sorry!
7. Storage and Organization: Keeping Your Bits in Tip-Top Shape
Finally, consider how the drill bits are stored and organized. A well-organized set makes it easy to find the size you need quickly and prevents the bits from getting damaged. Some sets come in sturdy cases with individual slots for each bit, while others are packaged in less durable containers.
A good storage solution will not only protect your investment but also improve your overall workflow. You’ll spend less time searching for the right bit and more time actually drilling. Think about how you plan to store and transport your drill bits, and choose a set that comes with a suitable case or container. It’s a small detail that can make a big difference in the long run, especially when you’re in the middle of a project and need to grab the right size quickly.
Frequently Asked Questions
What exactly *is* cobalt steel, and why should I care about it in a drill bit?
Cobalt steel is a special type of high-speed steel (HSS) that’s been alloyed with cobalt. This addition of cobalt, usually between 5% and 8%, makes the steel significantly harder, more heat resistant, and more wear-resistant compared to regular HSS drill bits. So, why should you care? Well, those properties translate to longer-lasting bits that can drill through tougher materials with less friction and less chance of burning out.
Think of it like this: standard HSS bits are great for softer materials like wood and plastic, but when you’re tackling stainless steel, hardened steel, or cast iron, a cobalt bit is your best friend. They’ll hold their edge longer, require less pressure, and ultimately save you time and frustration in the long run. You’ll get cleaner holes and avoid that annoying “squealing” sound of a dull bit struggling to cut.
Are cobalt drill bits only for metal? Can I use them on wood or plastic?
You absolutely can use cobalt drill bits on wood and plastic! They’ll definitely cut through those materials. However, it’s a little like using a Ferrari to go to the grocery store – it’s overkill! Cobalt bits are designed for tougher metals, so using them on softer materials might not be the most efficient or economical choice.
For wood and plastic, standard HSS or even brad-point drill bits are usually a better option. They’re less expensive, and their geometry is often better suited for creating clean holes in those materials. Cobalt bits can work, but you might find they’re more aggressive than needed, potentially leading to splintering or tearing, especially if you’re not careful with your speed and pressure.
How do I know if I’m drilling too fast or too slow with a cobalt drill bit?
Finding the right speed is key to getting the most out of your cobalt drill bits. If you’re drilling too fast, you’ll likely see excessive heat build-up, which can dull the bit quickly and even cause it to break. You might also notice the bit jumping around or chattering, and the shavings will be thin and discolored. Slow down!
Conversely, if you’re drilling too slow, you’re not allowing the bit to effectively cut into the material. This can lead to work hardening (especially in stainless steel), making it even harder to drill. You’ll also be putting unnecessary pressure on the bit, increasing the risk of breakage. Look for consistent, clean shavings – that’s your sweet spot. If you are getting very little or no shavings, increase your speed.
Do I *really* need cutting oil when using cobalt drill bits?
In most cases, yes, cutting oil is highly recommended, especially when drilling into harder metals like stainless steel or hardened steel. Cutting oil acts as a lubricant, reducing friction between the drill bit and the material being drilled. This helps to dissipate heat, prevent the bit from overheating, and ultimately prolongs the life of your drill bit. Think of it as giving your bit a refreshing drink of coolant during a strenuous workout!
Even when drilling softer metals like aluminum or brass, using a cutting oil can improve the finish of the hole and reduce the likelihood of the bit grabbing or chattering. While it might seem like an extra step, applying a little cutting oil can make a big difference in the quality of your work and the longevity of your drill bits. Plus, a squirt or two of oil now will save you the expense of a prematurely dulled bit later on!
Are all cobalt drill bits created equal? What should I look for?
Definitely not all cobalt drill bits are created equal! Just like anything else, there’s a range of quality out there. One key thing to look for is the percentage of cobalt in the steel. Higher percentages (closer to 8%) generally mean better heat resistance and longer lifespan. Also, pay attention to the manufacturing process – look for bits that are precision-ground for accuracy and sharpness.
The brand reputation also matters. Established brands with a history of producing quality tools are usually a safe bet. Read reviews and see what other users have to say about the performance and durability of specific bits. Don’t be afraid to spend a little more for a quality set – it will often pay off in the long run with better performance and a longer lifespan. After all, no one wants a drill bit breaking mid-project.
How can I properly sharpen cobalt drill bits? Is it something I can do at home?
Sharpening cobalt drill bits can be a bit tricky, but it’s definitely something you can learn to do at home with the right tools and techniques. However, keep in mind that maintaining the proper angles and relief grinds is crucial for optimal performance. If you’re not careful, you can actually make the bit worse!
A good bench grinder with a fine-grit wheel is a must-have for sharpening drill bits. There are also specialized drill bit sharpeners available that can make the process easier and more consistent. Start with light passes and avoid overheating the bit, as that can damage the temper of the steel. Practice on some inexpensive bits before tackling your good cobalt bits. If you’re unsure about your skills, it’s always a good idea to have them professionally sharpened.
How should I store my cobalt drill bits to keep them in good condition?
Proper storage is essential for keeping your cobalt drill bits sharp and ready for action. The best way to store them is in a dedicated drill bit case or organizer. This will protect them from damage and keep them separated, preventing the cutting edges from rubbing against each other and dulling prematurely.
If you don’t have a dedicated case, consider using a drill bit index or even a piece of foam to keep the bits organized and separated. Avoid just tossing them loosely into a drawer or toolbox, as this will almost certainly lead to damage and dulling. Also, keeping them dry is important, as rust can also dull your bits. A little care in storage will extend the life of your bits and ensure they’re always ready when you need them.
Final Words
Alright, you’ve taken a deep dive into the world of the best cobalt steel jobber drill bits, explored the features, and sized up the contenders. You’re now armed with the knowledge to conquer that next metalworking project, whether it’s a simple home repair or a more complex fabrication. Choosing the right drill bit isn’t just about making a hole; it’s about precision, efficiency, and the satisfaction of getting the job done right the first time. Remember to consider the specific demands of your materials and the longevity you’re seeking from your tools.
Now, go forth and drill! Don’t let that tough metal stand in your way. You’ve got the understanding to select the best cobalt steel jobber drill bits for your needs, and a little bit of confidence can go a long way. Embrace the challenge, trust your judgment, and enjoy the process of bringing your projects to life. The perfect cut is waiting!