DEWALT DCF850B Atomic 20V Max 3-Speed Impact Driver
- Torque: 1825 in-lb
- Maximum Torque: 18 in-lb
- Power Source: Battery
- Maximum Rotational Speed: 3250 rpm
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
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.
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ASIN: B09KVLY25QModel: DCF850BCategory: Impact Drivers & Wrenches
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.
Pros and cons
- 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 |
| Dimensions & fit | |
| Maximum Chuck Size | 4 Inches |
| Item Dimensions L X W X H | 3 × 3 × 8 inches |
| Capacity & performance | |
| Maximum Rotational Speed | 3250 rpmhigher than 66% of 71 impact drivers & wrenches |
| Speed | 3250 RPM |
| Drilling Capacity Wood | 0.2 inches |
| Drilling Capacity Metal | 0.2 inches |
| Battery Capacity | 5000 mAh |
| Number Of Speeds | 3 |
| Power & efficiency | |
| Power Source | Battery |
| Voltage | 20 voltshigher than 54% of 171 impact drivers & wrenches |
| Maximum Power | 300 watts |
| Battery Type | Lithium-Ion |
| Construction & materials | |
| Material Type | Blend |
| Color | Yellow |
| Included components | |
| Included Components | Tool,Belt Hook |
| Other details | |
| Torque | 1825 in-lbhigher than 64% of 75 impact drivers & wrenches |
| Maximum Torque | 18 in-lblower than 99% of 68 impact drivers & wrenches |
| Drill Type | Impact Driver |
| Is Electric | Yes |
| Item Type Name | ATOMIC 20V MAX* 1/4 In. Brushless Cordless 3-Speed Impact Driver (Tool Only) |
| Additional Features | Variable Speed |
Closest rivals on specs
CRAFTSMAN CMCK211C2 V20 RP Drill and Impact Driver Combo Kit- Maximum Rotational Speed 3250 vs 2800 rpm (+16%)
- Torque 1825 vs 1500 in-lb (+22%)
GALAX PRO GP95307 20V Cordless Impact Driver- Maximum Rotational Speed 3250 vs 2800 rpm (+16%)
- Maximum Torque 18 vs 885 in-lb (-98%)
- Torque 1825 vs 885 in-lb (+106%)
Makita XST01Z 18V LXT Oil-Impulse Impact Driver- Voltage 20 vs 18 volts (+11%)
- Maximum Torque 18 vs 355 in-lb (-95%)
- Torque 1825 vs 355 in-lb (+414%)
Frequently asked questions
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.