What Are Masonry Drills Bits?
Masonry drill bits are a variation of the twist drill bit. The difference is that masonry drill bits are made up of a softer form of steel, and strong tungsten carbide is brazed into the steel section to create the cutting edges.
Masonry drill bits are typically used with a hammer drill, which forces the drill bit into the material as it rotates. The hammering action is what breaks down the masonry where the drill bit tip is located. The moving flutes (spirals) from the drill bit, remove the dust. Rotating the drill bit also allows the cutting edges to move toward a fresh section of the bottom of the hole with every hammer action.
Hammer drill bits often use a special shank shape such as the SDS style. This allows the bit to slide within the chuck when hammering instead of the whole heavy chuck performing the hammering action.
Masonry drill bits are usually available in diameters from 3mm to 40mm. For larger sized holes, core drill bits are usually use. Masonry drill bits that reach 1,000 mm (39 inches) long can be used with hand-portable power tools. These are great for installing plumbing and wiring in existing buildings.
Single Masonry Drill Bit or Set of Drill Bits?
Choosing whether to use a single masonry drill bit or a set of drill bits depends on how much drilling you plan on doing into the concrete. If you are just completing a couple of quick jobs, then you can simply use a couple of single size drill bits. The best drill bits will be a ¼” and 5/16” as these are the most common. These two sizes cater to various anchor-type fixings as well as wall plugs as they aren’t very long.
Drill Bit Sets
If you plan on doing a lot of work in and around the home, then you may want to purchase a complete set of masonry drill bits. Drill bit sets provide more flexibility in the size of the holes created, as well as the attachments you can use for drilling. There are many great masonry drill bit sets available for awesome prices so this is a great investment.
What masonry drill bit do I need?
You always make the hole size smaller than any concrete screw used. For example, a 3/16” screw requires a 5/32” hole to be drilled, and a ¼” screw requires a 3/16 hole to be drilled into the material. But if your are creating sleeve or wedge anchors, you need to drill the same size of the hole as the size of the anchor.
Alternative to Masonry Drill Bits
Similar to the masonry drill bit is a star drill bit. They are similar in function and appearance to a chisel or hole punch, and are used as a hand powered drill along with a hammer in order to drill into masonry and stone. The cutting edge of a start drill bit consists of multiple blades which are joined in the centre to create a star pattern.