DEWALT DCF850B Impact
- Impact
- Battery
- 20 volts
- 3 × 3 × 8 inches
- Better rated than 62%
A compact, fast-spinning 20V impact driver at 3250 RPM, sold as a bare tool. Makes sense as an add-on for existing DEWALT 20V MAX owners rather than a first purchase.
As an Amazon Associate, ProductDome may earn a commission from qualifying purchases made through links on this page.
How it ranks among the 284 impacts we track
4.7★ across 360 Amazon ratings, Bayesian-smoothed toward the category average.
360 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
Modest tracked demand last month.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 284 impacts we track - how the scorecard works · full impacts data report. Confidence: high - strong rating volume and complete data.Last refreshed Aug 4, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
The DEWALT DCF850B is a 20V battery powered impact driver spinning up to 3250 RPM, measuring about 3 by 3 by 8 inches. The B at the end of the model number follows DEWALT's usual pattern for a bare tool, sold without battery or charger.
At 3250 RPM this sits toward the faster end of compact impact drivers, useful for driving long screws or working through repetitive fastening quickly. Its compact 3 by 3 by 8 inch footprint is aimed at tight spaces like cabinets or framing bays where a full-size driver would not fit. Buying it as a bare tool only makes sense if you already own compatible 20V MAX batteries and a charger.
- 20V battery powered
- 3250 RPM top speed
- 3 in x 3 in x 8 in body
- Bare tool, model ends in B
Who it's for
DEWALT 20V MAX owners who need an extra impact driver and already have batteries and a charger. Not a fit for anyone starting from scratch, since no battery or charger is included.
Strengths and trade-offs
Drawn from this product's published specifications.
- 3250 RPM for fast driving
- Compact 3 x 3 x 8 inch body for tight spaces
- Compatible with existing DEWALT 20V MAX batteries
- Sold as a bare tool, no battery or charger
- Zero recent purchases shown in this data window
Performance notes
A 3250 RPM top speed on the 20V platform gives quick fastening for screws and lag bolts, with impact action stepping in on harder-set fasteners to reduce cam-out. The compact 3 by 3 by 8 inch body helps in tight framing or cabinet work where a longer driver would bind against neighboring surfaces.
Specifications
| Brand | DeWALT |
|---|---|
| Model | DCF850B |
| Power Source | Battery |
| Voltage | 20 volts |
| Dimensions | 3 × 3 × 8 inches |
| Speed | 3250 rpm |
Other DeWALT impacts
How it compares
This product against the closest alternatives we track in impacts.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| DEWALT DCF850B ImpactThis product | 4.7 / 5 | 360 | 3.8 / 5 |
| Milwaukee 2457-20 ImpactMILWAUKEE | 4.6 / 5 | 8,078 | 4.5 / 5 |
| GEARWRENCH 81270 ImpactGEARWRENCH | 4.7 / 5 | 4,983 | 4.4 / 5 |
| AOBEN AB7331T ImpactAOBEN | 4.4 / 5 | 10,707 | 4.4 / 5 |
| Ryobi P235A ImpactRyobi | 4.7 / 5 | 4,700 | 4.4 / 5 |
Similar impacts from other brands
Questions about the DeWALT DCF850B
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
Does the DEWALT DCF850B include a battery?
No, the B in the model number follows DEWALT's convention for a bare tool sold without battery or charger.
What is the top speed of the DCF850B impact driver?
3250 RPM.
What size is the DEWALT DCF850B?
About 3 inches long, 3 inches wide and 8 inches tall.