How to Drill into Concrete
By: Date: January 16, 2021 Categories: Concrete,Drill,Uncategorized

Some of us might remember the pre-power tool days of drilling holes in masonry and concrete. And it wasn’t that long ago that any larger masonry job had a blacksmith on hand heating and re-sharpening chisels. (There were dedicated hand-saw sharpeners too, but that’s another story).

And in our age of microchipped tools, we’re lucky we don’t remember this because the last things pre-power tool concrete drilling was were fast or easy.

Back in the day, the best drill for concrete (and the only one) was a hardened steel bit, a sledgehammer, and a hand strength Thor would admire. Hit the bit like a nail, twist the bit a quarter turn, repeat. Some bit tips had a star pattern similar to what we’d call an SDS bit today. Others were more along the lines of what we’d call a “cold chisel.”

While the process remains unchanged—pulverize the concrete, remove the dust from the hole—the tools most certainly have changed.

Best Drills for Concrete

The best drill for concrete today is one of two tools: A hammer drill or a rotary hammer. They both do essentially the same thing but are vastly different tools.

Hammer Drill or Rotary Hammer?

Hammer drill

You’ve probably noticed that you can buy a cordless drill/driver or drill/driver kit where the included drill has a hammer drill function. If you’re going to purchase a cordless drill/driver, it’s advisable to get the hammer drill function. Even if you don’t need it right now, chances are you will.

The way a hammer drill works is to combine vibration with the twisting action of a typical drill. The actual part that does the vibrating is called a gubbins. Think about a gubbins like two poker chips rubbing together at high speed. This creates enough vibration (and noise; they’re loud and whiny tools) for the steel bit to pulverize the hard material in front of it and for the flutes to evacuate most of it.

A hammer drill is primarily for occasional drilling and smaller holes—think plastic anchors and screws (say for shutters or running coaxial cable) or #10 concrete screws.

Rotary Hammer

A rotary hammer is what a hammer drill wants to be when it grows up. And once you use one, you’ll probably want to leave your hammer drill in the rearview mirror.

A rotary hammer works like a jackhammer that twists: The bit reciprocates (i.e., travels forward and back in a linear fashion). It’s also smoother to operate, drills faster, drills larger holes, and is orders of magnitude quieter.

Of course, it’s more expensive (though not much for a corded model), as are the bits. There are some smaller cordless tools that are affordable and operate on a battery platform you may already have.

While it may seem silly, the main industry classification for rotary hammers tends to be by weight and chuck (or “bit holder”) size—5-pound, 10-pound, etc. The heavier the tool is the more it can do because the size of the components that do it get more massive as the tool capacity increases.

For 99% of around-the-house drilling, a tool in the 5-pound range with a ¾-inch bit holder will do just about anything you’ll need to do, from demo to drilling.

What is the Best Concrete Drill Bit?

While there’s a lot of parity among bits for general use, there are a lot of factors that go in to defining “best,” many of them subjective and situational. Perhaps the better answer to this question is that the “best” bit is the one you need to get the job done. (That said, it may sometimes be hard to tell the difference between bits.)

Generally speaking, hammer drill bits look like typical twist drill bits with an arrowhead of carbide at the tip and tighter fluting. With their smooth shank, these can only be used with a hammer drill and its 3-jaw chuck.

For a rotary hammer, the bit is called SDS Plus. This Slotted Drive System employs a thick bit end and grooves in which the bit travels. They’re more expensive and last longer than hammer drill bits.

Tool Tips

  • When fastening to brick or block, it is advisable to set the fastener or shield in the mortar joint between blocks.
  • To position something where you need it, say a shelf bracket, drill a pilot hole first and use a pencil or awl or to mark the concrete where the hole should line up. With a store-bought bracket or hose hanger, line up the holes with the mortar joint.
  • Start drilling slowly. The baseline function of these tools—unlike most others—is to cause vibration, so keeping the tip on a pencil dot requires a slow, methodical start until the bit hollows out the beginning of the hole. Just a few trigger pulls usually does the trick.
  • Let the tool do the work. You can’t press harder than concrete is dense. Keep a firm grasp and use two hands whenever possible. Bits can grab on aggregate in concrete and twist. The harder you press, the harder the tool has to work.
  • Blowing out the hole with compressed air is generally advisable and sometimes required. If you’re setting a lead lag shield (aka bung) or a small plastic shield, it’ll more easily slide into a hole that has no powdery dust left over.

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