Since these are general purpose bits, they are a good choice if you don’t have a specific project in mind. In general, twist drill bits do not need pilot holes because they are self-centering. However, they are not suitable for masonry. Twist drill bit: this is the most common type of drill bit, it is used to make holes in wood, metal, plastic and many other materials.There are several drill geometries available: PCD coating: for aluminum, non-ferrous and precious metals (silver and gold), carbide (before sintering), plastics and rubber, titanium alloys.It has a better resistance to high temperatures than diamond coatings. 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.Our pick: Irwin Cobalt Unibits – #4 bit is $60.99 and covers 3/16” to 7/8″ in 12 stepsįor more information about the PTR Best Drill Bits Buying Guide, head over to drill bits listed below are the most commonly used. They’re also great for widening existing holes and can eliminate the need for a knockout punch on holes up to 1-1/4″ or so. Multiple steps in these bits allow you to gradually cut wider holes in thin metal. Our pick: Bosch Daredevil High-Speed Auger Bits – 3-pc set is $34.97 Step Bits More expensive than spade bits, auger bits have a threaded tip which pulls the bit through the cut. Our pick: Bosch Daredevil Spade Bits w/threaded self-feed tip – 6-pc set is under $10 Auger BitsĪuger bits are basically a large twist bit with wide flutes for drilling large diameter, deep holes in tougher wood. These are not as smooth or clean cutting as an auger bit. Multiple shaft lengths give you the ability to drill deeper holes in both thick and thin materials. Spade bits make for an inexpensive way to drill holes up to 1-1/2″. Our pick: Bosch Daredevil Multi-purpose bits – 5-piece set is $18.97 Spade Bit/Paddle Bit You can take on holes up to 1/2″ before moving to a rotary hammer bit. They are more expensive than black oxide, titanium, or cobalt. These tungsten carbide tips chew through masonry and concrete like their SDS-plus/max brothers. Our pick: Milwaukee Red Helix Cobalt bits – $39.99 for a 15-pc set Concrete/Masonry Bits They can drill through tough metals like cast iron and stainless steel. Cobalt is blended with the steel to run through the entire bit. These bits have a higher price point and are typically reserved for metal cutting. Our pick: Milwaukee Shockwave Titanium Bits – $24.99 for a 15-pc set Cobalt Bits
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