DeWalt DCF870B Quiet Hydraulic Impact Driver
A brushless 20V hydraulic impact driver that runs dramatically quieter and smoother than a standard impact — the pick for finish work and occupied spaces.
Best for Trim carpenters, cabinet installers, and anyone driving fasteners indoors all day.
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Highlights
- Hydraulic FLUID-DRIVE mechanism runs up to 57% quieter than a standard impact
- Class-leading max torque among quiet hydraulic drivers
- Up to 40% faster driving than DeWalt's previous quiet driver
- Compact head gets into cabinets, boxes, and tight framing bays
- Low vibration means less hand fatigue over a full shift
Before you buy
- Sold as a bare tool — you supply the 20V MAX battery and charger
- Slightly slower flat-out than a hammering standard impact like the DCF850
- Hydraulic drivers cost more than a basic impact; you pay for the quiet
Quick take
If you drive fasteners inside finished homes, offices, or anywhere people are trying to work, the DCF870B is the impact driver to reach for. It swaps the machine-gun rattle of a conventional impact for a hydraulic drive that’s noticeably quieter and far smoother on your wrist — without giving up the torque you actually need.
Why hydraulic matters
A standard impact driver hammers a steel anvil to build torque. It’s loud, it’s harsh, and after a few hundred screws your hand knows it. DeWalt’s FLUID-DRIVE hydraulic system generates its rotational hammering in a sealed oil chamber instead. The result is a tool that measures up to 57% quieter and runs with a fraction of the vibration. On a job site with clients in the next room, that difference is the whole point.
On the bench
Torque is the pleasant surprise here — the DCF870B posts the highest max torque of any driver in the quiet-hydraulic class, so it isn’t a compromise tool you tolerate for the noise reduction. It sinks 3-inch structural screws without stalling, drives lags with authority, and its compact head clears the inside of a cabinet box where a full-size impact won’t fit. DeWalt also rates it up to 40% faster than the driver it replaces, and that shows up as fewer seconds per fastener across a day of repetitive work.
Before you buy
It’s a bare tool, so budget for a 20V MAX battery and charger if you’re not already on the platform. And if your work is all rough framing and lag bolts where noise doesn’t matter, a hammering standard impact will drive marginally faster for less money. For everyone doing finish and interior work, the trade is worth it.
Verdict
The best all-around quiet impact driver you can buy right now, and a genuine upgrade for anyone who works where noise and vibration count. It earns a top score.