DEWALT 20V MAX Cordless Impact Wrench, 1/2 Impact Gun, 4-Speed High Torque with Hog Ring Anvil and LED Light, Brushless Motor, Tool Only (DCF900B) Review (2026)

Who this impact wrench is for

The DCF900B is built for home mechanics, off-road hobbyists and anyone who does their own tire changes, suspension work or exhaust repairs. With up to 1030 ft-lbs of max torque and 1400 ft-lbs of breakaway torque, it has enough force to crack loose lug nuts that have been torqued on by an impact gun at a shop, plus corroded bolts that a hand ratchet cannot budge. Someone who only removes and reinstalls wheels a couple of times a year with a torque stick could get by with a smaller, cheaper impact driver, but anyone working on suspension, exhaust or drivetrain fasteners on a regular basis will notice the difference in raw torque and speed this tool provides.

Brushless motor and speed control

DEWALT built the DCF900B around a brushless motor that reaches up to 2300 RPM and 2200 impacts per minute, which translates to fast fastener removal once the tool is under load. The 4-speed control is the feature that keeps this from being a one-trick tool for only the toughest bolts, since dialing back the speed and torque protects smaller fasteners, plastic fender clips or anything else that could snap or strip if hit with full power. DEWALT also includes a precision wrench control mode aimed at reducing over-tightening and fastener run-off, which matters when you are reinstalling parts rather than just breaking things loose.

Hog ring anvil and LED light

Socket changes on this model use a hog ring anvil rather than a pin-detent design, which means you can push a socket on or pull it off without hunting for a small retaining pin, a real convenience when your hands are already covered in grease or you are working under a vehicle. An on-tool LED light is built into the housing to illuminate the fastener, useful in the dim corners of a garage bay or when reaching into a wheel well. DEWALT also uses a BatteryGuard shock-absorbing connection between the battery and tool body, intended to reduce the impact stress that connection takes during heavy use.

Bare tool considerations

This listing is for the tool only, without a battery or charger, so factor that into the total cost if you are not already invested in DEWALT's 20V MAX platform. For existing DEWALT 20V owners this is the cheaper way to add the impact wrench to a kit of batteries and chargers they already own. For someone starting from scratch, pricing out a battery and charger on top of the bare tool price is worth doing before comparing it against wrench kits that already bundle a battery, since the bare-tool price alone understates what you will actually spend to get it running.

Trade-offs to weigh

The main risk with any high-torque impact wrench, this one included, is that the same force that breaks loose stubborn fasteners can snap smaller bolts, strip soft lug nuts or over-torque parts if you are not careful with the speed settings. New users should get comfortable with the lower speed modes before running it at full power on anything delicate. Because it is sold bare, buyers also need to budget for at least one 20V MAX battery with enough capacity to keep up with the high-draw brushless motor, since an underpowered battery will limit the torque and runtime this tool is otherwise capable of.

Frequently asked questions