Impact drivers are built around bit driving and usually use a 1/4-inch hex drive; impact wrenches commonly use a square drive and sockets for larger nuts and bolts. The exact model controls drive size, output and accessory fit, so choose around the fasteners you install and service.
Both tools use rotational impacts, but their usual fasteners and output connections differ. DEWALT describes impact drivers as commonly using a 1/4-inch hex drive for smaller screws, while impact wrenches commonly use 3/8-inch square drive or larger for nuts and bolts. Those are typical formats, not a substitute for the exact model specification.
Match the tool to the fastener
| Job | Better fit | Check before buying |
|---|---|---|
| Drive construction screws or repeated smaller fasteners | Impact driver | Bit shank, control modes and the tool’s stated fastening range |
| Tighten or loosen nuts and bolts with sockets | Impact wrench | Anvil size, compatible sockets and the tool’s control features |
| Drill holes or set small fasteners with clutch control | Drill/driver | Chuck range, clutch settings and the bit the task requires |
The output interface is a quick way to identify what accessories a tool accepts. A hex collet is made for compatible bits; a square-drive anvil is made for compatible sockets. Wrenches also come in different drive sizes, so a socket set that fits one model may not fit another.
Compare exact models, not tool names
Manufacturers publish different drive sizes, speed settings and fastening specifications. Check those details against the fastener and the work in front of you. Do not treat a torque figure from one tool line as a complete comparison with another model; fit, control and accessory compatibility also affect the choice.
If the work is mostly screws and holes, start with the impact driver versus drill comparison. For fastening volume and compressor or battery setup, see pneumatic versus cordless framing nailers and cordless tool platforms. Browse power tools.
Source: DEWALT’s explanation of impact drivers and impact wrenches.
Common questions
What is the main difference between an impact driver and an impact wrench?
An impact driver is commonly set up for bit-driven screws and small fasteners. An impact wrench is commonly set up for sockets and larger nuts or bolts; drive size and accessory fit vary by model.
Can an impact wrench drive screws?
Some tools and adapters accept different accessories, but a wrench's drive size and control are usually aimed at socket work. Check the tool and accessory instructions for compatibility.
Should I buy an impact wrench or an impact driver first?
Choose a driver for repeated screw and construction-fastener work. Choose a wrench when the task calls for sockets on larger nuts or bolts.
Is an impact driver the same as a hammer drill?
No. An impact driver applies rotational impacts to turn a fastener. A hammer drill adds forward percussion for masonry drilling.