First, we used a drill press to evaluate them for drilling ability in aluminum, cast iron, and stainless steel. We spent 12 hours testing these drill bit sets. Machinists, mechanics, DIYers, and crafters value cobalt bits for their ability to drill hard materials and because they can be resharpened. The smallest bits can safely drill at about 3,000 rotations per minute (rpm), but larger bits should turn no faster than about 1,000 rpm. Also, drill at a slower speed with moderate downward pressure to avoid damaging expensive bits. We used 3-In-One Multi-Purpose Oil for our tests. Use a quality drilling lubricant with a high flash point. In addition, be aware that drilling into hard metal requires a special technique to ensure that the bit cuts into the metal smoothly without overheating. Before making a purchase, shoppers will want to make sure they’re buying the right drill bits for the job. Because cobalt alloy bits are more expensive than conventional metal drill bits, they aren’t economical options for drilling materials like wood or masonry. While these bits can cut a variety of materials, they are specifically designed to cut through hard metals such as stainless steel, cast iron, hard steel, and even titanium. Photo: Debbie Wolfe Before You Buy Cobalt Drill Bitsīefore deciding to purchase a set of cobalt drill bits for metal, shoppers will want to make sure they know what they’re getting. BEST STEP BITS: Milwaukee 3-Piece Cobalt Step Drill Bit Set.BEST METRIC: Stroton Metric M42 8% Cobalt Twist Drill Bits Set.BEST FOR STAINLESS STEEL: Milwaukee 15-Piece Cobalt Red Helix Drill Bit Kit.BEST M42: Bosch 14-Piece Cobalt M42 Drill Bit Set.UPGRADE PICK: Drill America Cobalt Jobber Drill Bit Set.BEST BANG FOR THE BUCK: Amoolo 13-Piece Cobalt Drill Bit Set.RUNNER-UP: Irwin 29-Piece Cobalt Alloy Steel M35 Drill Bit Set.BEST OVERALL: DeWalt Industrial Cobalt Alloy Steel Set. This guide will help you find the best cobalt drill bits for turning metal into Swiss cheese. Read on to find out more about our shopping considerations and testing process. We researched dozens of cobalt drill bit sets before testing the following picks. These powerful cobalt drill bits for cast iron, aluminum, and even stainless steel are made of a steel alloy of 5 percent to 8 percent cobalt. For that kind of strength, the only answer is cobalt alloy drill bits. We believe that that the Europa range of drill bits offers excellent performance and value-for-money for our trusted customers.There aren’t many materials strong enough to put holes in hardened steel. The business has been producing high-performance machining equipment, including cobalt drill bits, since 2004. Our Osborn cobalt drill bits are produced by Europa, a leading UK supplier of precision cutting tools. Cobalt may be incredibly tough, but you need to treat the drill bits with care because if they are dropped or mishandled, they can become damaged and may need to be replaced. The strength of cobalt, when mixed with an alloy, means they can safely operate at high speeds for long periods, without the need for cooling or cutting fluids.Ĭobalt drill bits are corrosion resistant, which means if they are treated with care they can deliver long-term performance. Cobalt has a melting point of 1495☌ and a boiling point of 2927☌, which makes it the ideal material for high RPM drilling. One of the strengths of cobalt is its ability to withstand high temperatures. Cobalt drill bits aren’t made from solid cobalt, but are a combination of steel and a percentage of cobalt – typically between 5-7%. Cobalt Drill Bits Why choose a cobalt drill bitĬobalt drill bits are incredibly tough and can drill into some of the hardest materials, including bronze, iron, stainless steel and titanium.
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