DEWALT 20V MAX Brushless 1/4 in. Cordless Impact Driver (Tool Only) – DCF840B

Overview

Discover the DEWALT 20V MAX brushless impact driver, a compact and high-output cordless tool designed to handle screwdriving and fastening tasks with ease. This listing is tool-only, so you can pair it with your existing DEWALT 20V MAX battery and charger. The efficient brushless motor balances power and runtime, delivering strong performance without adding unnecessary weight for longer, more comfortable work sessions.

With a maximum torque of 1,700 in-lb and a top speed of 3,200 rpm, you can tackle large-diameter screws and stubborn fasteners more smoothly than standard drivers. The 1/4 in. hex chuck enables fast bit changes, while the compact form factor improves maneuverability in tight spaces, from cabinetry to framing. The integrated 3-LED work light brightens dim corners, helping you maintain accuracy when visibility is limited.

Key advantages

• Powerful brushless motor delivering up to 1,700 in-lb of torque and up to 3,200 rpm for fastening
• Compact, lightweight design for improved ergonomics and access in tight spots
• Variable speed trigger for smooth starts and precise control on each fastener
• Integrated 3-LED work light to illuminate dark work areas

Real-world use and scenarios

Ideal for cabinetry, framing, and other fastening tasks where space is limited. The quick bit changes and controllable torque help you keep projects progressing with fewer interruptions. The tool’s balanced weight reduces fatigue during longer sessions, making it suitable for both DIY projects and professional builds.

• Cabinetry and furniture assembly: steady torque for repeatable screw driving
• Framing and rough-in work: reliable power in a compact package
• Decking and fastener-heavy tasks: controlled starts and consistent performance

Build and compatibility

Built to integrate with DEWALT’s 20V MAX ecosystem, this model focuses on durability and reliable operation. Note that this is a tool-only product; batteries and chargers are sold separately to fit your existing setup.