An air impact gun (impact wrench) is for heavy-duty nut and bolt work, while an impact driver is for driving screws and smaller fasteners.
Choosing between an air impact gun and an impact driver comes down to one thing: what you’re fastening. An impact driver is the compact tool for driving screws all day, while an air impact gun — what most people call an impact wrench — delivers the brute torque needed to break loose stubborn lug nuts and bolts. Here’s how to tell which one belongs on your workbench.
What Is An Air Impact Gun?
An air impact gun, more formally known as an impact wrench, is a high-torque tool designed for nuts and bolts. It typically uses a square drive — 3/8-inch or 1/2-inch — that accepts sockets for work on automotive and industrial fasteners.
As DEWALT explains, impact wrenches are larger and deliver more power than drivers, using a square drive and larger socket attachments. That added power is what makes them the right choice for:
- Removing lug nuts and rusted bolts
- Tightening heavy-duty fasteners
- Automotive suspension and engine work
What Is An Impact Driver?
An impact driver is a compact fastening tool built for driving screws. It uses a 1/4-inch hex collet that accepts hex-shank bits, and its design delivers rapid rotational impacts rather than sheer torque.
Impact drivers are usually smaller than impact wrenches and focus on speed, with models ranging from 3,900 to 4,000 RPM in Pro Tool Reviews testing. That speed makes them ideal for long screws, decking, drywall, and fasteners in dense wood. Some models can use hex-shank drill bits with an impact rating, but standard cylindrical drill bits won’t fit the 1/4-inch hex collet.
Air Impact Gun vs Impact Driver: Key Differences
The core differences come down to torque, speed, drive type, and intended job:
| Feature | Air Impact Gun / Wrench | Impact Driver |
|---|---|---|
| Typical torque | 100 to 1,000+ ft-lbs | 50 to 200 ft-lbs (up to 2,500 in-lbs) |
| Speed range | Often higher, some over 8,000 RPM | 2,500 to 4,000 RPM |
| Drive type | 3/8″ or 1/2″ square drive | 1/4″ hex collet |
| Primary fasteners | Nuts, bolts, lug nuts | Screws, hex-shank bits |
| Best for | Automotive, heavy bolting | Screw-driving, woodworking |
If you’re working on a vehicle and need to break loose rusted suspension bolts, an air impact gun is the tool for the job. For driving dozens of deck screws, the lighter, faster impact driver will save your arms.
Choosing Between The Two
Start with the fastener. Screws belong to the impact driver; nuts and bolts belong to the impact gun. If you’re doing automotive work, an air impact gun with 1/2-inch drive sockets is essential. If you’re building furniture, installing trim, or driving screws, an impact driver is the everyday tool.
Match battery voltage to the job if you go cordless: Air tools require a compressor and hose setup, which trades portability for consistent power.
One caution applies to both: these tools generate serious force. A high-torque impact driver can strip screw heads or shear bolts before you notice, so start slow on delicate work.
For the best air impact gun options tested and compared, see our roundup of top air impact guns with specs and real-world performance notes.
FAQs
Can I use an impact driver with sockets?
Yes, with a hex-to-square-drive adapter, but it’s not a standard use case. The adapter adds bulk and reduces torque transfer, so for serious nut-and-bolt work you’re better off with a proper impact wrench.
Will an impact gun damage my tools?
Not if you use impact-rated bits and sockets. The repetitive shock loads can shatter standard chrome sockets and twist off drill bits not rated for impact use.
Can one tool do both jobs?
Not really. Impact wrenches are too bulky for fine screw-driving, and impact drivers lack the torque for heavy bolting. Owning both covers the full range of fastening work.
References & Sources
- DEWALT. “What is the difference between an impact driver and impact wrench?” Official guidance on tool selection and drive types.