What's inside
As an Amazon Associate I earn from qualifying purchases. This post may contain affiliate links at no extra cost to you.
What we cover
What “rebar-free” concrete means
If you know the concrete is free of rebar, you can focus on the drill and bit rather than choosing a tool for cutting steel. That does not make the job effortless: a cordless hammer drill is best for small holes in ordinary concrete, not repeated large-diameter drilling or deep holes in hard aggregate. For a shelf, bracket, or a handful of wall anchors, it can be a practical choice. For many holes, a rotary hammer is usually faster and easier on your hands.
Check the drilling location before you start. Concrete may contain electrical conduit, plumbing, or embedded metal even when you are not expecting rebar. Use an appropriate detector, avoid likely service routes, and stop if the bit meets unexpected resistance. “Rebar-free” is not a reason to drill blindly.
As an Amazon Associate we earn from qualifying purchases at no extra cost to you.
What to buy
For occasional holes around 1/4 to 3/8 inch in diameter, a good 18V or 20V cordless hammer drill with a side handle is generally enough. A cordless hammer drill with a side handle gives you control if the bit binds and can also handle ordinary drilling and screwdriving with hammer mode switched off.
Compare the manufacturer’s stated masonry capacity, not just voltage or advertised torque. Check whether the tool includes a side handle, whether its battery is included, and whether its chuck accepts the bits you need. A chuck’s maximum capacity does not tell you how quickly it can drill that diameter in concrete.
For regular concrete work, larger holes, or a long list of anchors, consider a cordless SDS-plus rotary hammer. It uses a different chuck system and SDS-plus bits, so it is not a direct replacement for a standard hammer drill. The added cost and bulk are hard to justify for three small holes, but worthwhile when a hammer drill stalls or makes the job drag.
Hammer drill or rotary hammer?
| Tool | Best fit | Trade-off |
|---|---|---|
| Compact cordless hammer drill | A few small anchor holes, roughly 1/4 inch | Light and versatile, but slow in hard concrete |
| Full-size cordless hammer drill | Occasional holes up to the maker’s stated masonry capacity | More control and capacity than a compact model; still tiring in sustained drilling |
| Cordless SDS-plus rotary hammer | Repeated holes, larger diameters, or deeper drilling | More effective in concrete, but heavier and needs SDS-plus bits |
These are practical categories, not guarantees. Concrete strength, aggregate, bit condition, battery charge, and hole depth all affect speed. A budget hammer drill may be perfectly adequate for a few 1/4-inch holes in a soft slab. Paying for a rotary hammer will not make sense if it will spend the rest of its life driving screws.
Bits, batteries, and useful accessories
Use a carbide-tipped masonry bit intended for the tool’s chuck. For a standard hammer drill, use a round-shank or hex-shank bit that fits securely. For an SDS-plus rotary hammer, use SDS-plus bits. A regular wood or metal drill bit is not a substitute, and an SDS-plus bit will not fit a standard three-jaw chuck without the correct adapter.
Match the hole diameter to the anchor manufacturer’s instructions. An undersized hole can prevent the anchor from seating; an oversized or ragged hole can reduce its holding power. Keep holes only as deep as required, allowing a little extra depth for dust. Check anchor packaging for any specified minimum spacing and edge distance, especially near slab edges.
Battery size is a trade-off: a larger pack can sustain drilling longer but adds weight at arm’s length. One charged battery may cover a small installation; for a row of holes, a spare avoids waiting. A carbide masonry bit set is useful if the project calls for several diameters, but a single quality bit in the correct size is often better than a large, cheap assortment.
How to drill without burning time or bits
Mark the hole and start with the drill square to the surface. Use hammer mode for concrete and a moderate speed with steady pressure. Let the hammering action do the work; forcing the tool can overheat the bit, wear the chuck, or cause a sudden bind. Keep both hands on the drill when practical, especially with a larger bit, and use the side handle if supplied.
Pull the bit out occasionally to clear dust, particularly in deeper holes. Dust packed around the flutes slows cutting and heats the bit. If progress stops, do not keep leaning harder. Withdraw the bit, clear the hole, check that hammer mode is on, and inspect the tip. A worn or overheated bit can make a capable drill seem weak. If the tool still barely advances, change to an SDS-plus rotary hammer rather than spending the afternoon forcing it.
Concrete dust is harmful to breathe. Wear eye protection and a properly fitted particulate respirator, and control dust with a suitable vacuum attachment or careful collection at the hole. Keep the battery and drill vents clear of dust. Before inserting an anchor, remove loose debris from the hole; follow the anchor maker’s cleaning instructions if it specifies them.
Common problems and when to step up
A hammer drill can stall, kick, or drain its battery quickly when the hole is too large, the concrete is unusually hard, or the bit is dull. Compact drills are especially prone to getting outpaced by long or repeated holes. If the bit binds, release the trigger and regain control; do not twist the tool free while it is powered. If you encounter suspected metal, stop and reassess rather than treating it as ordinary concrete.
For a few small, properly sized anchor holes, a cordless hammer drill is the lower-cost, more flexible buy. For many holes, bigger bits, or persistent slow progress, an SDS-plus rotary hammer is the more sensible tool. Choose by the actual diameter and number of holes you need to drill, not by a headline power figure.