A hammer drill is the right tool whenever you need to make holes in concrete, brick, stone, or other masonry materials. A standard drill relies on rotation alone, which isn’t enough to penetrate these hard surfaces. The hammer drill adds rapid percussive blows, essentially punching the bit forward thousands of times per minute while it spins, so the material cracks and chips away instead of just resisting the bit.
If you’ve ever tried pushing a regular drill into a concrete wall and felt it spin uselessly or barely scratch the surface, that’s the problem a hammer drill solves. Knowing when you actually need one, and when you don’t, saves both time and money.
Materials That Require a Hammer Drill
Any time you’re drilling into masonry, a hammer drill is the standard tool. This includes poured concrete (like basement walls, foundations, sidewalks, and driveways), concrete block, brick, mortar joints, stone, and stucco over concrete. These materials are too hard and brittle for a regular drill bit to cut through by rotation alone. The percussive action breaks up the material at the tip while the rotation clears debris out through the bit’s spiral flutes.
Concrete block tends to be on the softer end, in the 1,900 to 3,000 PSI range, which hammer drills handle easily. But they’re also effective on harder poured concrete like driveways and sidewalks. For most homeowner and light commercial tasks, drilling holes up to 1/2 inch in diameter, a hammer drill is sufficient and more cost-effective than heavier alternatives.
Common Projects That Call for One
The most frequent reason people reach for a hammer drill is anchoring something to a masonry surface. Mounting a TV bracket on a concrete wall, securing a handrail to brick steps, fastening shelving into a basement wall, running cable clips along a concrete foundation, or installing a mailbox post into a concrete pad all require drilling into masonry first, then inserting an anchor.
Other typical uses include installing concrete screws (like Tapcon fasteners) for attaching framing to a slab, drilling through brick for venting or running pipes, and making holes in stucco-covered walls for exterior fixtures. If you’re hanging curtain rods in a brick loft or mounting a security camera on a concrete garage wall, a hammer drill is what gets the hole made.
When Not to Use Hammer Mode
Most hammer drills have a switch that lets you turn the hammering action off, converting the tool into a regular drill. You should do this for wood, metal, plastic, drywall, and tile. The percussive action doesn’t help with these materials and can actively cause problems.
Wood is flexible enough that a hammer drill can push through it, but the hammering is unnecessary and reduces your control over the hole. Metal is where things go wrong more noticeably. Thin metal will bend and deform under the repeated impacts, especially sheet metal or automotive body panels. The hammering also puts stress on the bit in ways that cause premature dulling. For tile and glass, the percussive blows will crack the material before you get a clean hole. Use a standard drill with the appropriate specialty bit for those surfaces.
Hammer Drill vs. Rotary Hammer
A hammer drill and a rotary hammer both combine rotation with percussion, but they work differently and suit different scales of work. A hammer drill uses two ridged discs inside the chuck that click against each other to create the hammering motion. It’s lighter, cheaper, and doubles as a regular drill when you switch off the hammer function. A rotary hammer uses a piston mechanism that delivers much harder, more efficient blows.
The practical dividing line comes down to hole size and volume. A hammer drill handles holes up to about 1/4 inch in poured concrete and up to 3/8 inch in block and softer masonry. For occasional drilling, like a few anchor holes on a weekend project, it’s the right choice. Once you need holes larger than 1/2 inch, or you’re drilling dozens of holes in a single session, a rotary hammer becomes significantly faster and easier on your body. Rotary hammers use SDS-plus bits for holes from 5/32 inch to 3/4 inch, and SDS-max bits for holes up to 2 inches.
For most homeowners, a hammer drill covers 90% of what they’ll encounter. If you’re a contractor drilling concrete anchors all day, the rotary hammer earns its higher price quickly.
You Need the Right Bits
A hammer drill is only as effective as the bit you put in it. Standard twist bits designed for wood or metal will dull almost instantly against concrete and can overheat or shatter. Masonry bits are built specifically for this work, with a steel body and a carbide or tungsten tip that’s hard enough to chip away at stone and concrete. The spiral flutes along the shaft pull dust and debris out of the hole as you drill.
When buying bits, make sure they’re compatible with your drill’s chuck. Standard masonry bits with a smooth round shank fit into the three-jaw chuck on a hammer drill. SDS bits, which have grooved shanks that lock into place, are designed for rotary hammers and won’t work in a standard hammer drill chuck. Percussion masonry bits are a subcategory designed for softer materials like brick and aerated concrete blocks, so if that’s what you’re drilling into, they’re a good match.
How to Get Clean Results
Hammer drills deliver tens of thousands of blows per minute. Consumer models typically operate in the range of 46,000 to 48,000 BPM, with rotation speeds around 1,300 RPM in hammer mode. That’s a lot of energy being transferred through the bit and into your hands, so technique matters.
Start by marking your hole location with a center punch or a small dimple to keep the bit from walking across the surface. Begin drilling at a low speed to establish the hole, then increase to full speed once the bit has seated. Apply steady, moderate forward pressure: enough to keep the bit progressing into the material, but not so much that the motor bogs down or the bit overheats. If you feel the drill struggling, ease off slightly and let the hammering action do its work rather than forcing it.
For deeper holes, periodically pull the bit partway out while it’s still spinning to clear dust from the hole. Packed dust reduces the bit’s effectiveness and generates excess heat. On holes deeper than a couple of inches, this becomes especially important.
Use the side handle if your drill came with one. Hammer drills can kick or bind when the bit catches on rebar or hits an aggregate pocket in concrete. The side handle gives you a second point of control to resist that torque and keep the drill steady. Some newer models include electronic kickback control that automatically stops the drill if it binds, but the side handle remains your primary safety tool. Keep a firm grip, brace your stance, and avoid wearing loose clothing that could catch on the spinning chuck.
Corded vs. Cordless
Corded hammer drills with 8 to 10 amp motors deliver consistent power for extended drilling sessions and tend to cost less upfront. They’re the better choice if you’re working near an outlet and need to drill multiple holes in hard concrete. Cordless hammer drills have improved dramatically and now handle most light to moderate masonry tasks on a single battery charge. An 18V or 20V cordless model with a brushless motor is perfectly capable of drilling a handful of anchor holes into brick or block.
Where cordless models fall short is sustained heavy use. Drilling into hard poured concrete repeatedly will drain a battery quickly and generate heat that slows the tool down. If your project involves more than a dozen holes in tough concrete, a corded model or a spare battery keeps you from stalling out halfway through.