![]() Likely a form of Titanium Nitride and Aluminum (TiAlN) coating, it helps retain sharp cutting edges and reduce heat build-up. Spyder uses a proprietary Mach-Blue plating on its drill bits. Mach-Blue or Titanium Nitride and Aluminum (TiAlN) Coated Bits Cobalt bits are our go-to for drilling through metal-particularly hardened steel and stainless steel. This helps save money when you buy these more expensive bit sets. That also means you can sharpen them with something like the Drill Doctor 750X drill bit sharpener before having to replace them. Since the cobalt is blended into the steel, it doesn’t wear away like a titanium or black oxide coating. You can also find these bits with a 5% cobalt blend (M35). Our best Cobalt drill bits for metal drilling are made from an alloy of 8% cobalt (M42). Don’t use these bits for drilling hardened steel or stainless-not if you want them to last. As the coating wears off the cutting edges, you pretty much have to replace them. With titanium nitride, you have to remember it only coats the bit. For metal drilling, we recommend these as the bare minimum. It beats black oxide because it increases surface hardness and does a better job reducing heat while drilling through metal. Titanium Coated Drill Bits (TiN or TiCN)ĭrill bits made with a Titanium nitride coating resist corrosion and friction. HSS dulls very quickly when used on more abrasive material. You can use these bits for just about anything-so they serve as a jack-of-all-trades for both wood and metal applications. Able to hold up better to excessive heat and wear, they make up a majority of drill bits sold on the mass market. High-Speed Steel (HSS) Drill Bits present an upgrade over older carbon steel bits. When it comes to the best drill bits for metal, however, only a few materials hold up well over time. You can find many types of drill bits made with an equally diverse amount of coatings and compositions. You can find the 15-piece kit for $38 or the 29-piece kit for $150.īuy on Amazon What are the Best Drill Bits for Metal Made of? The value of this kit makes these the best drill bits for steel. Thanks to the cobalt steel blend, plan on sharpening these when the tips grow dull from use. ![]() Lacking a 1/4″ hex, use these in your drill or drill press when you need them for thicker, harder metals. ![]() The combination of the unique cutting head and the flute design landed these as our best drill bits for steel-particularly carbon steel. We love how quickly these bits drill and also how well they remove steel in tight, efficient spirals. The 135° split point tip helps when starting your hole and larger sizes feature a Chip Breaker-a groove at the midpoint of the cutting edge that further reduces heat buildup. The result is a more compact bit with a similar drilling depth. However, they also extended the flutes lower towards the shaft. Milwaukee countered this by making them a bit shorter than some others we’ve seen. The trade-off is that these bits thin out more towards the tip. Their unique design not only helps them drill efficiently, but it also aids in cooling. How quickly? About 30% faster than most other 135° split-tip bits we tested against. Listed in our best drill bits article, Milwaukee Red Helix cobalt bits use a variable flute design that clears away debris quickly. Pick up the Jobber Length Drill America D/A29J-CO-PC kit for just $120. The round case makes it simple to remove the exact bit you need. It includes 29 bits in a shatterproof case. Use these bits when drilling tough, high-tensile strength materials like stainless steel-or even titanium. Drill America also doesn’t grind down the shafts on its larger bits-so you get more rigidity, but you also need a 1/2-inch chuck to drive them. Because of how hard they are, you can drill up to 30% faster than you can with conventional M2 high-speed steel bits. They come manufactured to the National Aerospace Standard 907. The jobber length bits work perfectly in cordless drills for onsite drilling. The bits feature the expected 135° split point, which gives you a nice, steady, and productive drilling speed. After testing with a multitude of materials, we selected their jobber bits as our best drill bits for hardened steel. Drill America makes M42 cobalt bits that held up really well in drilling through anything we threw at them.
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