CBN coating: for treated steel products above 45-50 HRC, gray iron, hardened chrome alloyed cast iron, cobalt, nickel and iron based anti-wear alloys.It has a higher hardness than CBN layers for example. Diamond coating: for abrasive materials such as graphite.These are suitable for refractory materials but cannot be sharpened. Ceramic drill bits: for high temperatures and even higher cutting and feed speeds without chip formation on the tool.Carbide drill bits: have a cutting speed four times higher than HSS drill bits, but they are fragile.HSS (high speed steel) drill bits: higher speed machining, versatile and less expensive than carbide tools.Hard metal drill bits: for general use.Rolled steel (occasional use) or hardened steel (regular use)įerrous and non-ferrous metals, Stainless steel etc.ĭrill bits and cutting inserts come in a variety of materials, each with its own advantages and disadvantages. Ĭoncrete, Reinforced concrete, Concrete blocks, Stone They are characteristically used with a low drilling speed. For tile and glass: these drills bits look like small spears.Drill bits for masonry: these steel drill bits have a brazed tungsten carbide tip.When it comes to drill bits for metal, inserts are only used for machine tools. For metal: these drill bits are used to drill any kind of metal.For wood: these types of drill bits can be used on any wood, whether it is softwood, hardwood, veneer or plywood.Step drill bits are protected from damage such as this because they are made of stainless steel or carbon steel.The drill bits listed below are the most commonly used. Even when using them on wooden workpieces, they may break. There are cheap, low-quality drill bits available that are prone to breaking. Standard drill bits, on the other hand, may or may not be made of high-quality metal. They are often made of high-quality metal, such as stainless steel or carbon steel. Regardless, most step drill bits can create clean holes in sheet metal. Some step drill bits require a hole puncher for sheet metal, whereas others do not. Depending on the particular type of step drill bit, you may need to punch a hole in the sheet metal beforehand. You can drill holes into sheet metal using a step drill bit. Step drill bits are commonly used on sheet metal. As you move farther up the step drill bit, the hole will become larger. The first step will create the smallest hole. And each of these sections represents a different hole size. They feature a canonical design with multiple sections or steps.

You can, however, use a step drill bit.Īll step drill bits support holes in multiple sizes. You can’t use a standard drill bit to create two or more holes in different sizes.

Standard drill bits, of course, only offer a single hole size. With a step drill bit, you won’t have to manage a bunch of different drill bits. Developed by Unibit, this popular step drill bit is capable of drilling holes in nine different sizes. You can see an example of a step drill bit in the photo above. Step drill bits are long, canonical bits that have multiple steps. What Is a Step Drill Bit?Ī step drill bit is characterized by multiple steps, each of which represents a different hole size. Step drill bits, however, feature a canonical design that distinguishes them from other types of drill bits. You can place a step drill bit in the chuck of your power drill, and after tightening the chuck, you can proceed to drill holes with it. They work with nearly all types of power drills. If you’re tired of constantly swapping out drill bits for different sizes, you should consider investing in a step drill bit.

Different types of drill bits chart