Many manufacturers complement construction materials like drill bits with metal coatings. These bits offer precision to users who drill stainless steel and other hard materials. Also, unlike carbide tips or titanium coatings, cobalt drill bits can be resharpened when the tip becomes worn. The added cobalt content makes these drill bits harder and more resistant to heat buildup than a typical HSS bit, giving them much greater durability. They are made with a special steel alloy that includes 5 percent to 8 percent cobalt. Cobalt drill bits are an extension of HSS bits. High-speed steel, also known as HSS, is the most common drill bit for metal drilling. Infusing drill bits with cobalt is another way that manufacturers achieve ultrahard drill bits. These carbide-infused drill bits are one strong option when drilling straight into stainless steel. Titanium and tungsten carbide are nearly as hard as diamond, making them ideal for penetrating steel. One way that manufacturers achieve this hardness is by infusing materials that facilitate penetration and protect against overheating.Ĭarbide is one such material found in drill bits for stainless steel. Therefore, a drill bit for use with stainless steel must be harder than the steel itself. Low-carbon steel bits, like those used to drill into wood, do not perform when applied to stainless steel. Stainless steel is an extremely hard material. Read on to learn the factors to consider as you search for the best drill bits for your projects that involve stainless steel. To identify the best drill bits for stainless steel, learning about characteristics like material, coating, frequency of use, and drill bit number are critical. Not all drill bits achieve results in the same way. Photo: Debbie Wolfe What to Consider When Choosing the Best Drill Bits for Stainless Steel ALSO CONSIDER: Milwaukee 15-Piece Cobalt Red Helix Drill Bit Kit.MOST PRECISE: Milwaukee 3-Piece Cobalt Step Drill Bit Set.BEST FOR HOBBYISTS: Bosch CO14B 14-Piece Cobalt M42 Drill Bit Set.BEST METRIC: Stroton Metric M42 8% Cobalt Twist Drill Bits Set.
#BEST COBALT DRILL BITS FOR HARDENED STEEL UPGRADE#
UPGRADE PICK: Drill America 29-Piece Cobalt Jobber Drill Bit Set.BEST BANG FOR THE BUCK: Comoware Cobalt 15-Piece Twist Drill Bit Set.RUNNER-UP: DeWalt Industrial Cobalt Alloy Steel Set.BEST OVERALL: Irwin 29-Piece Cobalt Alloy Steel M-35 Drill Bit Set.Read on to find out what makes a durable and effective drill bit for stainless steel, our selection criteria, and how our selections performed in testing. We spent more than 40 hours researching the best materials and designs used to make these bits, selecting our top picks, and then testing our picks in the workshop.
With loads of available bits for hard metal applications, finding the right drill bits for stainless steel can be challenging. Luckily, manufacturers design special drill bits capable of puncturing even the hardest grade of stainless steel. Drill bits built to work on softer material, like wood, won’t do the trick against stainless steel. Whether you’re expanding the size of a junction box punch-out or boring out a broken bolt, having the right drill bit matters. DIYers and trade professionals often need to drill stainless steel to complete a variety of electrical, plumbing, and automotive projects. Available in several grades, each with at least 10.5 percent chromium, stainless steel is popular because of its low maintenance, high sheen, and resistance to stains and rust.
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