Why the two names get mixed up
A drill is built to make holes. A driver is built to turn fasteners, mainly screws. The confusion comes from the fact that most cordless tools sold for home use are labeled “drill/driver” and do both jobs, so the words blur together. On top of that, “driver” can mean three different things: a plain screwdriver, the driving mode of a drill/driver, or a separate tool called an impact driver. This article keeps those apart.
In short, a drill favors speed and a firm grip on round bits. A driver favors controlled rotational force (torque) and a grip that fits screw-driving bits. A good deal of what separates them comes down to four features: the chuck, the clutch, the torque and the speed.
The chuck: how the bit is held
A drill or drill/driver has a three-jaw chuck that tightens around a round or hex shank. That lets it hold twist bits of many sizes as well as screw-driving bits. Chucks come in a few designs, and the differences between drill chucks (keyed, keyless and SDS) are worth knowing if you are matching bits to a tool.
An impact driver usually has no chuck at all. Instead it has a hex socket, commonly sized for 1/4-inch hex shank bits, into which a bit snaps or is pushed. This is faster for swapping screw bits and keeps the bit from slipping under heavy load. The trade-off is that it only accepts hex-shank accessories, so standard round-shank twist bits generally need an adapter or a hex-shank design.
The clutch: stopping at the right moment
Most drill/drivers have a clutch, which is the numbered ring behind the chuck. When the resistance on the fastener reaches the number you set, the clutch slips with a ratcheting sound instead of continuing to turn. This protects screw heads, wood and drywall from being over-driven, and it protects your wrist from a sudden twist.
Using the clutch well is mostly about starting low and working upward. Clutch settings and torque limiting are covered separately; the point here is that a clutch is a major reason a drill/driver is gentler on delicate work than an impact driver, which typically has no adjustable clutch. In drilling mode, most drill/drivers have a separate setting (often marked with a drill-bit symbol) that bypasses the clutch so the tool delivers its full available force.
Torque and speed: two different kinds of strength
Torque is twisting force. Speed is how fast the bit spins, usually described in revolutions per minute. The two trade off against each other: a tool geared for more speed gives up some torque at that setting, and the reverse is also true. Many drill/drivers have a two-speed gearbox switch, with a low range for driving screws and a higher range for drilling. If you want the definitions in detail, tool RPM and torque are explained elsewhere on this site.
For drilling, higher speed generally suits small bits in wood, while larger bits and harder materials such as metal usually call for slower speeds. Following the bit manufacturer’s guidance and the tool manual is the safest approach. A trigger with variable speed control lets you start slowly so the bit does not wander, then speed up once it bites.
For driving, lower speed with strong torque gives you control. A drill/driver does this by turning steadily with the clutch as a limit.
How an impact driver is different
An impact driver adds a mechanism that delivers rapid rotational “hammering” blows when the fastener meets resistance. These are small, quick bursts of extra twisting force, not forward blows like a hammer drill. The result is that an impact driver can turn large screws and bolts that would stall a standard drill/driver, while putting less twisting strain on your wrist because the tool does the work in bursts.
This is why an impact driver is popular for driving long screws and for work like decking and framing, where hundreds of fasteners go in. The downsides are noise, which is considerably louder than a drill/driver under load, and less finesse: without a clutch it is easy to drive a screw too deep or snap a small one. It is generally a poor choice for delicate hardware or for making clean holes.
A note on hammer drills
A hammer drill is a different variation altogether. It adds a hammering action along the axis of the bit, which helps break up masonry as it drills. If you are planning to drill into brick or concrete, hammer drilling masonry is a separate topic, and rotary hammers (a heavier tool again) handle larger jobs. Do not confuse the forward hammering of these tools with the rotational impacts of an impact driver.
Which tool for which job
| Job | Usually suits |
|---|---|
| Drilling holes in wood, plastic or thin metal | Drill/driver |
| Driving small or delicate screws, cabinet hardware | Drill/driver with clutch |
| Driving long screws, lag screws, decking | Impact driver |
| Removing stubborn fasteners | Impact driver (with the right bit) |
| Drilling brick or concrete | Hammer drill or rotary hammer |
| Making large holes with a hole saw | Drill/driver, often at low speed |
Those are tendencies, not strict rules. A drill/driver can drive long screws if you drill a pilot hole first, and a skilled user can drill small holes with an impact driver using hex-shank bits. Still, matching the tool to the work makes the job easier and reduces damage.
Pilot holes deserve a mention because they connect the two tools: drilling a pilot hole with a drill, then driving the screw with a driver, helps prevent splitting wood and reduces strain on the screw. Choosing the right screw drive types, such as Phillips, Torx or square, also matters, since a bit that fits tightly will cam out less.
Practical safety points
- Wear safety glasses or goggles whenever you drill or drive; good eye protection habits matter because bits can shatter and debris flies.
- Clamp small workpieces rather than holding them by hand, since a bit that catches can spin the piece.
- Remove the battery or unplug the tool before you change a bit or accessory, or at least lock the trigger.
- Let the tool work instead of leaning hard on it, and back out the bit occasionally when drilling deep to clear debris.
- Follow the manufacturer’s manual for your specific tool, especially for speed ranges and approved accessories.
This is general information and not a substitute for the instructions that come with your tool.
Choosing if you can only have one
For most households that own a single tool, the drill/driver is the more versatile choice because it drills well, drives screws with control and works with ordinary round-shank bits. An impact driver is a strong second addition once you find yourself driving lots of long screws or working on projects like decks and fences. Neither fully replaces the other, and many people end up owning both.