The more cobalt a drill bit contains the harder the metal you will be able to drill however, the increase in cobalt has a downside in that it makes the drill bit more brittle. The two most commom percentages are 5% (also known as M35 ) and 8% (known as M42 ) Which option you choose is going to depend on how much money you have to spend upfront, how often you plan on using the bit, and what material you need to drill.Cobalt drill bits are drill bits which contain a percentage of cobalt. With harder materials, they will need more frequent sharpening, which can wear their coating down quickly.Īll in all, both of these bits dissipate heat well and can handle tougher materials. They cost you less up front and won’t wear down super quickly when put up against these softer materials. With that said, titanium bits are best for wood and softer metals. For Working with Wood and Soft Metal, Choose Titanium But they last longer, so you’ll save more in the long run. Cobalt bits are quite a bit more expensive than titanium ones. Of course, this is assuming that you have a bit of money to spend upfront. They are best for professionals, though DIYers, with lots of projects, will appreciate them as well. They are just going to last longer and can be used with even the toughest materials. If you work with a wide variety of materials, you probably want a set of cobalt bits. It depends on what material you’re working with and what you’re trying to accomplish. Once again, neither of these drill bits is better than the other. Once it gets thin enough, it won’t do its job correctly. However, this coating does wear down over time. This coating protects the metal core from the heat and dissipates it along the surface. For titanium drill bits, it’s the titanium coating. Most drill bits out there designed for tougher materials have some design feature that is made to dissipate heat. When you’re drilling metal with a metal bit, things are going to get hot. Because of this, you really can’t sharpen the titanium drill bits very much before they become unusable. When you sharpen titanium drill bits, this coating comes off as well. This is a problem when you’re drilling metal since metal-on-metal can get very hot, very fast. When the coating is completely gone, the bit would have lost much of its heat resistance. There are only a few situations where the material sets the bits apart. While the differences in material are a significant difference between cobalt and titanium drill bits, in practice, you probably aren’t going to notice a huge difference. However, these bits do not contain any cobalt. This titanium is essential for preventing overheating, as we discuss below. Instead, they have a metal core and a titanium coating. Titanium drill bits are not entirely made with titanium. However, there are a few slight differences that set them apart from their Cobalt cousins – though both do look very similar at first. They are also made to drill through tougher materials, like metal. Titanium drill bits are similar to cobalt drill bits. You don’t have to worry about one of these blades getting very hot. They can dissipate heat very quickly, even at top speeds. Cobalt is particularly good at dissipating heat over the contact surface. However, cobalt blades are made to dissipate heat. That is just the nature of rubbing two pieces of metal together very quickly. TemperatureĪll metal-on-metal bits are going to heat up. You can sharpen cobalt bits many times before they become unusable. This gives them a longer lifespan, which saves you money over the long-term. They do not have a coating, so there is no surface stripping when sharpening them. SharpeningĬobalt bits are pretty easy to sharpen. The cobalt also prevents the bit from getting too hot as it spins against other metals.Ĭobalt bits have no coating at all, which differs from titanium drill bits. This makes them extremely tough and able to go through the most rigid materials out there, like cast iron. They’re usually around 5% to 8% cobalt, with the rest being steel. They’re very tough bits, making them suitable when others just won’t do.Ĭobalt drill bits are made with a mixture of cobalt and steel alloy. However, they do contain a bit of cobalt, which is where they get their name from.ĭespite their primary use for metal, they can also be used for softer materials. They are not made of pure cobalt, which we will discuss in-depth shortly. Cobalt drill bits are designed for cutting through all sorts of metal, including stainless steel and cast iron.
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