To determine which between cobalt and black oxide is better, you need to weight the benefits and drawbacks of both. Ultimately, it boils down to what you’re cutting through and how deep you want to go. Now, most manufacturers claim that cobalt is better than black oxide, but that’s not essentially true. Black oxide drill bits are more popular because they are more pocket-friendly and widely available.Ĭobalt drill bits are quite pricey but they do come with durability. There is an assortment of drill bits in the market and as you can imagine, they are not the same. Cobalt bits will still be able to withstand high temperatures, but they won’t wear down as fast as the black oxide ones will over time. That also means that these drill bits can be used in high temperatures without overheating.Ĭobalt is also resistant to heat, but it has a different composition to black oxide. This is the reason why many brake calipers are made of black oxide. Both are superior materials that can help make your project a success, but you need to keep in mind that each has its own application.īlack oxide is designed resist heat. If you’re building a new deck or outdoor structure, it’s not uncommon to come across black oxide and cobalt drill bits. On the other hand, cobalt drill bits can be used to drill holes in hard materials like masonry, glass and tile without getting dull.Ĭobalt drill bits can also be used to cut through glass, tile and masonry without breaking or chipping as easily as black oxide drills. They will also break when overheated or overused.īlack oxide drill bits can be used to drill holes in most types of metal and wood, but they will become dull after a certain period of time. With black oxide drill bits, you can expect chipping especially when too much pressure is applied. This is because they are made with cobalt steel rather than low carbon steel. On the other hand, cobalt drill bits are stronger and more expensive than black oxide drill bits. The black color is applied during the heat-treating process. ![]() This is because they are cheap yet durable. Perhaps you don’t know this but black oxide drill bits are now the most common type of drill bits used. Nonetheless, if your project is a small scale one, or if you don’t plan on drilling anything harder than plastic or softwood, then you might want to consider saving your coins by purchasing Black Oxide drill bits instead. They are also crafted with high precision and sharpened to within 0.0005 inches, making them more efficient and suitable for complex projects.Ĭobalt bits tend to cost more than those made from Black Oxide simply because they are more superior in quality. That said, cobalt drill bits are more resistant to wear and tear because they have a higher carbon content than Black Oxide bits. Of course, that makes them extremely hard but that doesn’t mean that they won’t break or chip when used incorrectly. Durabilityīoth Black Oxide and Cobalt bits are made of high-speed steel (HSS). However, they are more resistant to breaking and can usually handle more types of material without damage. On the other hand, black oxide drill bits will not cut through as many different types of material as cobalt ones and that is because they’re not as hard. The irony is that they can break when used on softer materials like wood or plastic. You see, cobalt drill bits tend to be harder than black oxide drill bits, and that makes them perform better when cutting through tougher materials like steel. The thing is that ultimately, it depends on what you prefer. You are probably wondering what material between the two will cut better. Black Oxide vs Cobalt Drill Bits: Make your Decision Hardness This makes them perfect for drilling in hard materials such as stainless steel and high carbon steel. These drill bits are harder than black oxidation bits, but not as hard as high-speed steel or titanium nitride coated bits. What Is Cobalt Drill Bit?Ĭobalt drill bits are cobalt-based alloys that have been heat-treated to increase hardness and strength. ![]() They can also be used for drilling in moderately hard materials like cast iron and mild steel. These properties make cobalt-tipped drill bits ideal for drilling in softer materials like wood and plastics. Black Oxide vs Cobalt Drill Bits: Make your DecisionĪ black oxide drill bit is a high carbon steel accessory that has undergone a heat treatment process to harden the surface.īlack oxide drill bits are moderately hard and easy to sharpen and they cost less than cobalt drill bits.
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