Twist bits are the most common type of drill bit out there. Therefore, they should not be used in most hand-drills and drill-presses. Titanium nitride-coated bits are suitable for most:Ĭarbide-tipped drill bits are very tough and only suitable for specialty jobs that require drilling into extremely hard materials. The tip must be recoated with titanium nitride (TiN) when it becomes dull, but it's usually cheaper to just replace the bit. They also dissipate heat even more quickly than cobalt bits and are the best choice for general production work. Titanium-coated bits are sharp and harder than cobalt bits. Since the friction from drilling into hard metals creates so much heat, these bits are the ideal choice for: Use these bits for:Ĭobalt drill bits are made of a hardened steel alloy that quickly dissipates heat. These highly versatile bits are great for:īlack oxide-coated HSS bits resist rust and corrosion better than HSS bits, and they're 50% more durable. High speed steel (HSS) drill bits consist of strong tool steel, which makes them inexpensive and very common. Here are some common drill bit materials and the types of jobs they're good for. The material that a drill bit is made out of determines its lifespan and degree of functionality, so make sure that the one you're using is suitable for the material that you're drilling into. It's also important to know that a drill bit's size refers to the diameter of its body, but most bit sets have the sizes commonly needed for most jobs. When deciding on a bit, remember that flatter points are better for harder materials and may require a pilot hole to get started. The shank is connected to the drill bit's shaft and ends at the point. They have high torque transmission and can be chucked with one hand, but they're not very accurate when centering. Slotted drive systems require an SDS chuck and are great for hammer drilling. These can be held in a 3-jaw chuck for quick removal and insertion, but they are not as accurate as straight shanks. These shanks have very accurate centering. Straight shanks are round and are held in a 3-jaw chuck by the friction from tightening it. Understanding Drill Bitsįor starters, the shank is the bit's end that stays secured in your drill's chuck. It's important to understand which drill bits you need for your project before making a purchase. Using the wrong bit can not only damage the substrate and tool itself, but it can also lead to injury. Drill bits are used to make different sized holes in various types of materials, so it's important to know which bit is best for your project.
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