Concrete Drill Bits: How to Choose the Right Bit and Rotary Hammer
The best concrete drill bit is a carbide-tipped bit that matches your tool’s chuck. For most anchor and conduit work, that means an SDS-Plus bit in a rotary hammer. Use a four-cutter head if you expect rebar. Use a two-cutter head if you want speed in plain concrete. A standard twist bit in a regular drill will not get you far.
This guide covers how concrete bits differ from masonry bits, how to pair a bit with a rotary hammer, how to drill cleanly and safely, and how to tell when a bit is done. If you want help matching bits to a specific job, our staff does that every day.
Key Takeaways
- Concrete bits have carbide heads shaped for hard material and work best with a hammer drill or rotary hammer. Masonry bits suit softer material like brick.
- SDS-Plus covers most anchor work from 3/16 in to 1-3/16 in. SDS-Max is built for larger, heavier holes. The two shank types do not interchange.
- Two-cutter bits are fast in plain concrete. Four-cutter and eight-cutter bits hold up better when rebar shows up.
- Concrete dust contains respirable silica. Use dust extraction, a respirator and a side handle every time.
- A bit is finished when the carbide edge is worn about two-thirds of its width or the wear mark is gone.
Table of Contents
- What Makes a Concrete Drill Bit Different
- SDS-Plus vs. SDS-Max Concrete Bits
- Carbide Head Styles: Two, Four and Eight Cutters
- Core Bits and Other Concrete Bit Types
- Match the Bit to the Rotary Hammer
- How to Drill Concrete With a Rotary Hammer
- Concrete Dust and Silica: Protect Your Lungs
- When to Replace a Concrete Drill Bit
- Choosing Concrete Bits by Job
- Get Concrete Bits and Rotary Hammers Delivered
- FAQ
- Sources
What Makes a Concrete Drill Bit Different
Concrete is hard, abrasive and full of aggregate. A steel twist bit dulls in seconds. A concrete bit solves this with a carbide head brazed onto a steel body, and a flute design that carries dust out of the hole.
The tip also does something clever. According to HowStuffWorks, the tip of a masonry bit is wider than the shaft behind it, so once the shaft reaches the hole it slides right in. The same source notes that drilling at a lower speed is more efficient and keeps the bit from overheating.
That is the basic principle. The details change with the tool you use and the material you drill.
Concrete bits vs. masonry bits
People use the two names loosely, and plenty of retail packaging does too. There is a real difference, though. Bosch Professional explains that concrete bits are made for hard materials such as concrete or granite and paired with a hammer drill. Masonry bits are for soft to medium-hard materials like solid brick and are paired with an impact drill. Both have carbide heads, but the head shape is adapted to the material.
In practice:
- Masonry bits with a round shank fit a standard drill chuck. They work for brick, block, mortar joints, tile and light concrete jobs where you only need a few small holes.
- Concrete bits with an SDS shank lock into a rotary hammer. They are the choice for anchors, rebar dowels, wedge anchors, sleeve anchors and any repeated drilling in slab, footing or foundation walls.
If you are drilling a couple of pilot holes for a shelf on a block wall, a good masonry bit and a hammer drill can do it. If you are setting a row of anchors for a sill plate, you want a rotary hammer and SDS bits.
SDS-Plus vs. SDS-Max Concrete Bits
SDS stands for the slotted shank system. The bit slides into the chuck and floats a little, so the hammer mechanism can strike the back of the bit while the chuck rotates it. No keyed chuck, no slipping, and bit changes take a second.
There are two common sizes, and they are not interchangeable. As Pro Tool Reviews puts it, you match an SDS-Plus or SDS-Max rotary hammer with the same bit connection.
When SDS-Plus is the right call
SDS-Plus handles the vast majority of concrete work. Industrial Monitor Direct lists a typical SDS-Plus range of 5 mm to 30 mm, which is 3/16 in to 1-3/16 in. That covers:
- Wedge and sleeve anchors from 1/4 in to 3/4 in
- Concrete screw pilot holes
- Threaded rod and adhesive anchor holes
- Electrical and plumbing penetrations in slab and block
- Light rebar-crossing work
SDS-Plus rotary hammers are also lighter, which matters when you are drilling overhead or working off a ladder. Cordless options make that easier still. We carry the Makita 18V LXT 7/8 in cordless rotary hammer for light-to-medium anchor work and the M18 FUEL 1 in SDS Plus rotary hammer when you want more capacity.
When to step up to SDS-Max
The same source lists SDS-Max bits at 12 mm to 52 mm (1/2 in to 2 in) as standard. For a 1 in hole, an SDS-Plus hammer is at the top of its efficient range, and some operators step up to SDS-Max once the count goes above a dozen or two holes at that diameter.
The reason is physical. The SDS-Max shank is 18 mm instead of 10 mm, and the source calculates that this raises the section modulus roughly 5.8 times. In plain terms, the bit takes more hammer energy without flexing or cracking at the groove root.
If you drill big holes all day, look at our 1-9/16 in rotary hammer that accepts SDS-Max bits.
Quick comparison
| Feature | SDS-Plus | SDS-Max |
|---|---|---|
| Shank diameter | 10 mm | 18 mm |
| Typical bit range | 3/16 in to 1-3/16 in | 1/2 in to 2 in |
| Tool weight | Lighter, easier overhead | Heavier, more impact energy |
| Best for | Anchors, conduit, light rebar | Large holes, high hole counts, heavy demolition |
| Cordless options | Common | Less common |
Shank and size ranges come from the Industrial Monitor Direct comparison above.
Carbide Head Styles: Two, Four and Eight Cutters
The carbide head is where most of the performance difference lives. Shop around and you will see bits with two, four or even eight cutting edges.
Two-cutter bits. According to Pro Tool Reviews, these are excellent for fast drilling in unreinforced concrete. They are not designed to cut rebar and tend to bind when they hit it. If your slab is plain and you have a lot of holes, a two-cutter bit gets you through quickly.
Four-cutter bits. The same review says four-cutter bits last longer and can cut through rebar where a two-cutter head binds. It adds that kickback control helps prevent injury, and that you can still damage either style on rebar. A four-cutter head is the safer default when you do not know what is inside the concrete.
Eight-cutter bits. Some newer SDS-Plus designs go further. Build-Construct reports that an eight-cutter design can deliver up to four times the life of a standard bit in rebar-heavy concrete. The logic is simple: more edges share the impact load, and when one chips the rest keep cutting.
Which head should you buy?
- Plain slab, many holes, speed matters: two-cutter.
- Existing structure, unknown reinforcement: four-cutter.
- Heavy rebar, production anchoring, bit cost per hole matters: multi-cutter heads rated for rebar.
A bit that hits rebar is still under stress. If you are setting structural anchors, check the anchor manufacturer’s instructions and the engineer’s plans before cutting reinforcing steel.
Core Bits and Other Concrete Bit Types
Not every hole is a hammer-drilled hole. Here is how the other main types fit.
- Hammer drill masonry bits (round shank). Fit a standard keyed or keyless chuck. Good for light work and DIY.
- SDS-Plus and SDS-Max bits. For rotary hammers. The right choice for anchors and heavy drilling.
- Core bits. Cut round, cylindrical holes for pipes and large penetrations. They are used with rotary hammers, core drills or diamond core rigs, depending on size.
- Hollow dust-extraction bits. Pull dust through the bit body into a vacuum. We cover these below.
For a full shelf of options, browse our drill bits and bit sets.
Match the Bit to the Rotary Hammer
Two checks decide the pairing.
Shank type. SDS-Plus bits go in SDS-Plus tools and SDS-Max bits go in SDS-Max tools. Check the tool’s label or product page before you buy bits.
Hole size and workload. A 1 in or 1-1/8 in SDS-Plus hammer covers nearly all anchor work. Milwaukee’s M18 FUEL 1-1/8 in SDS Plus rotary hammer with ONE-KEY is a good example of a tool that reaches the top of that range. If you want a kit with dust control, the Makita 18V LXT brushless 1 in rotary hammer kit comes with a HEPA dust extractor attachment.
Cordless or corded is mostly about access. Cordless tools save time when you are moving between rooms, floors or outdoor spots with no power. Our posts on cordless rotary hammers for mobility and the top two cordless rotary hammers go deeper on runtime and power. If you are still deciding between drill types, read how to choose the right drill.
Browse the full rotary hammers and SDS drills range, or call and tell us the job. We will point you to the right bit and tool.
How to Drill Concrete With a Rotary Hammer
Good technique makes bits last and keeps the tool under control. Pulling from Power Tools Today, here is the sequence that works.
- Scan first. Check for utilities, conduit and reinforcing steel before every drill point.
- Install the side handle and keep a two-hand grip. If a large SDS-Max bit binds, the tool can twist with enough force to break a wrist or throw you off a ladder.
- Use hammer mode with a carbide-tipped SDS bit. Never use hammer mode on tile, glass or non-masonry materials.
- Start slow. Run at low speed until the bit establishes its path, then go to full speed.
- Let the tool work. Apply steady forward pressure without forcing it.
- Back the bit out every 2 to 3 inches to clear dust from the flutes.
- Clean the hole. For anchors, clear dust before setting, since dust left in the hole can reduce how well an anchor holds. Follow the anchor maker’s cleaning steps.
That last step is where many installers lose time. A hole that is brushed and blown or vacuumed clean sets anchors properly the first time.
Depth, speed and heat
Heat kills carbide braze joints. If the bit is smoking or the tip is discolored, you are pushing too hard, running too fast in a stuck hole, or letting dust pack the flutes. Back out, clear the hole and ease off. Letting a bit cool in the air is better than quenching it in water.
Concrete Dust and Silica: Protect Your Lungs
Drilling concrete throws off fine dust, and some of it is respirable crystalline silica. OSHA’s standards (29 CFR 1926.1153 for construction) set a permissible exposure limit of 50 µg/m³ as an 8-hour average and an action level of 25 µg/m³, as summarized by OSHA Safety Training.
For everyday drilling, three habits matter:
- Capture dust at the source. Pro Tool Reviews recommends hollow core bits, universal shrouds or onboard dust extractors to collect silica dust while you drill.
- Wear a respirator. Power Tools Today advises a P100 or at least an N95, plus a vacuum dust extraction attachment.
- Keep bystanders out of the work zone and clean up with a HEPA vacuum, not a broom.
If you manage crews, you also need a written exposure plan and training that fit your job. These road construction safety guidelines are a useful companion on silica exposure and controls for concrete drilling. We stock safety equipment and jobsite PPE and safety kits and PPE bundles so respirators, eye protection and hearing protection ship with your bits.
When to Replace a Concrete Drill Bit
A dull bit drills slowly, runs hot and puts more strain on your hammer and your wrists. Learn to spot the signs early.
- Worn carbide edge. One bit-damage guide from Alma Bolt says a bit is at the end of its life when the cutting edge of the carbide tip is worn more than two-thirds of its width.
- Wear mark. DEWALT’s Elite Series SDS Plus bits have an anchor wear mark on the carbide tip. Once it is no longer visible, change the bit so anchors install properly. Build-Construct makes the same point: when the mark on the flute near the tip disappears, the carbide is nearly gone, and continuing risks a seized bit.
- Slower progress and more heat. If the same pressure gives half the speed, check the tip.
- Undersized holes. A worn bit cuts a smaller hole. Anchors that no longer fit are a late warning.
Keep a spare bit in the same size on the truck. Swapping in a fresh one is cheaper than losing an hour on a hot, dull bit.
Choosing Concrete Bits by Job
| Job | Typical bit and tool | Notes |
|---|---|---|
| A few holes in block or brick | Masonry bit, hammer drill | Round shank, low speed |
| 1/4 in to 1/2 in anchors in slab | SDS-Plus two- or four-cutter, rotary hammer | Four-cutter if you may hit rebar |
| Threaded rod or adhesive anchors | SDS-Plus, often with dust extraction | Clean the hole thoroughly |
| Holes near 1 in, many of them | SDS-Max bit and tool | Less strain on the bit |
| Large pipe penetrations | Core bit | Match the core bit to the rig |
Get Concrete Bits and Rotary Hammers Delivered
We are a family-owned supplier that has served contractors, builders and homeowners since 2007. Our staff can help you match a bit to your rotary hammer and the material you are drilling, and we carry Milwaukee, DeWalt, Makita, Metabo HPT and Stabila.
Local businesses get free jobsite delivery within 50 miles of our locations, so bits, batteries, anchors and PPE arrive where the crew is working. Start at Polar Tool & Supply, shop online or stop in, and tell us what you are drilling.
FAQ
What drill bits will go through concrete?
Carbide-tipped bits made for masonry or concrete. Use a hammer drill with a round-shank masonry bit for light work, or a rotary hammer with an SDS-Plus or SDS-Max bit for anchors and heavier drilling. Standard steel twist bits will not last.
Is there a difference between a masonry and concrete drill bit?
Yes. Both have carbide heads, but the head shape differs. Concrete bits are shaped for hard materials and used with a hammer drill, while masonry bits are meant for softer material like brick, according to Bosch Professional. Many bits are sold for both, so check the rated material on the package.
Can I drill concrete with a regular drill?
You can make small, shallow holes with a masonry bit and patience, but it is slow and hard on the tool. A hammer drill is better, and a rotary hammer is the right tool for anchors or repeated holes. Run at low speed and back out often to clear dust.
What is the best bit for drilling through rebar?
A four-cutter or multi-cutter carbide bit handles rebar better than a two-cutter, which tends to bind. Pro Tool Reviews notes you can still damage either style, so use kickback control and keep a firm two-hand grip. For structural reinforcement, follow the engineer’s plans.
Do I need SDS-Plus or SDS-Max?
SDS-Plus covers most anchor work up to about 1-3/16 in. Choose SDS-Max if you drill large holes in volume. Bits must match your tool’s shank, since the two systems do not interchange.
Sources
- HowStuffWorks: What kind of drill bits do I need for brick or concrete?
- Bosch Professional: Drilling into concrete
- Pro Tool Reviews: How to choose the right rotary hammer bit for concrete drilling
- Industrial Monitor Direct: SDS Plus vs SDS Max chuck comparison
- Build-Construct: Drilling into concrete with rebar
- Power Tools Today: Rotary hammer safety tips
- OSHA Safety Training: Respirable crystalline silica training
- Alma Bolt: Masonry drill bit damage
- DEWALT: Elite Series SDS Plus drill bit
