An impact driver is mainly a screwdriving tool. An impact wrench is mainly a socket tool for nuts and bolts. They both deliver twisting impacts, but the way they hold accessories—and the work they are built around—makes them useful for different jobs.
What “impact” actually means
A conventional drill turns its chuck with continuous rotational force. An impact tool can add repeated rotational blows as resistance rises. That hammering helps it turn a fastener that takes more effort to move.
The blows act in the direction of rotation. That is different from a hammer drill’s action into the material. The similar names can be confusing: an impact driver is not simply a smaller hammer drill. DEWALT explains the shared rotational action of drivers and wrenches.
Why a driver suits screws
An impact driver typically holds a 1/4-inch hex-shank bit. Phillips, Torx, and square-drive bits let that same tool work with different screw heads without changing the tool itself.
That makes it useful for repeated screwdriving, such as assembling timber framing or driving suitable construction screws. Milwaukee’s M12 Subcompact impact driver (3450-20) is one compact example of this hex-bit format.
A driver is not automatically the best choice for every screw. For delicate assembly, a drill/driver’s clutch or a hand screwdriver may offer more appropriate control. More driving force is helpful only when the fastener and material can take it.
Why a wrench suits sockets
An impact wrench has a square anvil that accepts sockets. Instead of engaging a recess in a screw head, the socket fits around a nut or bolt head. This is the format commonly associated with mechanical fastening and removal work.
Milwaukee’s M12 FUEL Stubby 3/8-inch impact wrench (2562-20) illustrates the difference. Its square drive is designed around socket work, even though the compact body might resemble an impact driver.
The drive size describes the accessory connection. It does not tell you the socket’s fastener size or guarantee a particular torque output. Two wrenches with the same drive can have very different capabilities. Socket depth is a separate choice too: deep and shallow sockets solve different access problems.
Does a socket adapter make a driver a wrench?
A hex-to-square adapter allows a driver to accept compatible sockets. It changes the connection, not the driver’s motor or impact mechanism. That can be useful for suitable occasional socket work, but it does not make the driver equivalent to a dedicated wrench.
Impact-rated accessories belong with impact tools. Where a joint requires a specified final tightening torque, the impact tool’s setting is not a substitute for the appropriate torque-measuring tool and procedure.
Which one earns a place in your kit?
For regular screwdriving, the driver is the natural starting point. For regular nut-and-bolt work, the wrench is the more relevant tool type. Someone who does both has a reason to own both; they are serving different parts of the job.
A drill and driver also make a useful separate pair: one for drilling, the other for driving screws. Whether that pair belongs in a bag or a dedicated case depends on how you carry and access the tools. The pictured ToolFellas M12 Subcompact insert stores the specific 3401-20 drill and 3450-20 driver together in the 48-22-8435 organizer.
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