DEWALT ATOMIC 20V MAX 3-Speed Brushless Cordless Impact Driver (Tool Only) DCF850B

DEWALT ATOMIC 20V MAX 3-Speed Brushless Cordless Impact Driver (Tool Only) DCF850B

By DEWALT · Impact Drivers · Power Tools

  • Up to 1,825 in-lbs of fastening torque
  • 3-speed control with precision wrench mode
  • About 4 in. head length for tight spaces
  • Three-LED ring lighting around the chuck
  • Brushless motor, 20V MAX battery platform (battery sold separately)

Price not listed

Prices are snapshots. Check the current price with the store.

Summary

A compact 20V MAX brushless impact driver sold as a bare tool, for DEWALT owners who already have batteries and need to drive screws in tight spaces. It trades some raw power for one of the smallest heads in its class, so decide whether compactness or maximum fastening power matters more before buying.

Strengths

  • Pro Tool Reviews measured a 3.97 in head and 2.1 lb bare, and called it the most compact 18/20V impact driver it had tested.
  • Three speeds and a variable-speed trigger give enough control for small fasteners.
  • Three LEDs ring the collet and stay on up to 20 seconds after the trigger.
  • It runs on the shared 20V MAX platform, which DEWALT says spans 300+ tools.
  • Owners pair it with a compact POWERSTACK battery and call it their favorite impact driver in that setup.
  • One owner rates DEWALT’s bit-removal and ejection system as the best of the impacts he has owned.

Weaknesses

  • In Pro Tool Reviews’ test it was slower than the larger DCF887, averaging 10.12 s versus 9.64 s on 8-inch structural screws.
  • It is not DEWALT’s highest-output driver; buyers chasing maximum power should look at XR models.
  • The bare tool ships with no battery or charger, so real cost depends on the packs you already own.
  • One owner disliked the spring-loaded bit ejection, saying it jumps out of screws, and reported recoil that requires two hands.
  • Some owners report lateral play in the chuck; a tool editor says some chuck play is normal across impact drivers.
  • Impacts in this class are loud, and one commenter switched to hydraulic/surge drivers for indoor work.

Verified specifications

ModelDCF850B bare tool; kit variants DCF850P1 and DCF850E1.
Platform20V MAX, which DEWALT footnotes as 18 V nominal.
Motorbrushless.
Drive1/4 in hex quick-release.
Max torque1,825 in-lbs (205 Nm; 152 ft-lbs), manufacturer’s maximum rating.
No-load speed0–1,000 / 0–2,800 / 0–3,250 RPM, three speeds.
Impacts per minute0–3,800 IPM on DEWALT-derived specs; one retailer lists 3,600 IPM.
Length3.97 in (DEWALT states under 4 in).
Height8 in.
Weight2.1 lb bare; about 3.5 lb with a 5.0Ah battery and about 2.9 lb with a POWERSTACK pack.
Work lightthree LEDs around the collet, lit by the trigger and staying on up to 20 seconds after release.
Includedtool and belt hook; battery and charger sold separately.
Warranty3-year limited, 1 year free service, 90-day satisfaction guarantee.
Dimensions3.97 in long and 8 in tall bare; shipping package 4.8 × 3.38 × 8.38 in (Northern Tool).
Full research notes and sources

Compactness, power and the trade-off

Size is the DCF850B’s point. Pro Tool Reviews measured the head at 3.97 in front-to-back and the bare tool at 2.1 lb, and named it the most compact 18/20V impact driver it had tested. DEWALT rates it at up to 1,825 in-lbs of maximum torque, 3,250 RPM and 3,800 IPM; that torque number is the manufacturer’s maximum rating, not an independently measured sustained value, and no instrumented sustained-torque test was found.

The trade-off showed up in testing. Driving 8-inch GRK RSS screws into stacked OSB on freshly charged 5.0Ah batteries, Pro Tool Reviews averaged 10.12 s with the DCF850 against 9.64 s with the larger DCF887, about half a second a screw. In a later head-to-head the same outlet said it got consistently higher performance from the DCF887 and chose that tool for the comparison. Owners who mostly want fastening power should look at DEWALT’s XR drivers; cabinet, framing and tight-space work is where the smaller body pays off.

Batteries, kit and daily upkeep

As a bare tool the DCF850B includes only the driver and a belt hook, so the cost depends on the 20V MAX batteries and charger you already own. Weight shifts with the pack: about 3.5 lb with a 5.0Ah battery and about 2.9 lb with a compact POWERSTACK. Owners consistently say the compact pack is the better pairing. A larger pack adds runtime but also weight and bulk that partly defeats the compact feel.

Kit variants bundle the battery and charger. One owner who bought the 2021 kit considered its 2-amp charger a weak point, and the same owner reported that his tool and batteries were made in Mexico, a single observation rather than a manufacturer statement. DEWALT publishes an instruction manual and exploded diagrams for DCF850 Type 1, which helps with parts identification.

Owners on handling and noise

Owner commentary centers on control and size. ToolGuyd’s editor, who bought one near launch, says it is perfectly paired with the compact PowerStack battery, and other commenters call it their favorite impact driver in that configuration. One owner who compared it against Milwaukee and Makita found the DEWALT slightly more controllable than the Milwaukee, though he also said the tool requires two hands and punched out the back end twice as much as the Milwaukee. Another owner disliked how the spring-loaded ejector can jump out of a screw.

Chuck play is a recurring nitpick rather than a confirmed fault: one commenter asked whether the DCF850 shares the lateral slop of earlier DEWALT models, and ToolGuyd’s editor replied he had not noticed it on this tool but that some chuck play is normal. On noise, a commenter noted conventional impacts like this are really loud and said he moved to hydraulic/surge drivers for indoor use. No exact-model defect pattern or failure rate was found.

What it costs and when to buy

Tool-only prices have varied widely by store. Snapshots show $169.00 at Northern Tool and $169.00 at The Power Tool Store, with Walmart listing text around $95.73-$97.17. Pro Tool Reviews quoted $149 bare tool and $199 as a kit with a 5.0Ah battery at its 2022 review. Promotions have bundled the tool with a charger and battery for about $149-$199: a 2021 Black Friday kit at $199 with a free bonus 5Ah battery, and a 2023 Labor Day Home Depot bundle with a POWERSTACK battery for $149. One owner reported paying $129 CAD for the bare tool in 2023.

Value depends on whether you already own 20V MAX packs and how much compactness matters. At the lower tool-only prices it is an easy recommendation for an existing DEWALT owner. Near $169 bare, it competes with DEWALT’s own XR models and with bundles, so compare kit pricing before paying full bare-tool price.

Which model this is

This page covers the DCF850B bare tool, UPC 885911758215. Kit versions are the DCF850P1 and the DCF850E1 with a POWERSTACK battery. Don’t confuse it with the larger 20V MAX XR DCF887 and DCF888, or the newer XR DCF845 and DCF860. DEWALT lists Type 1 manual revisions for this model and publishes exploded diagrams for repair.

Sources

Manufacturer:

Independent reviews:

Owner reports:

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