DEWALT DCF840B 20V Max Brushless Impact Driver
- Torque: 1700 in-lb
- Maximum Torque: 1700 in-lb
- Power Source: Battery
- Maximum Rotational Speed: 3200 rpm
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
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ASIN: B09MLL4G3GModel: DCF850BCategory: Impact Drivers & Wrenches
Overview
DEWALT's DCF850B runs on the brand's 20 volt battery platform, reaching a stated 3200 RPM as an impact driver rated at 15 amps.
Voltage, amperage and speed are all listed, which is more than several other entries in this batch, but chuck size and torque output aren't specified. The listed weight figure is not usable, so no weight claim is made here.
- DEWALT 20 volt platform
- Battery powered impact driver
- 3200 RPM top speed
- 15 amp rating
Who it's for
A fit for anyone already on DEWALT's 20 volt platform who wants a fast-spinning driver for repetitive fastening. Not ideal if torque output or included accessories need confirming first.
Pros and cons
- Fits DEWALT's 20 volt battery platform
- 3200 RPM top speed
- No torque rating listed
- No chuck size listed
Performance notes
Running on DEWALT's 20 volt battery platform, the DCF850B reaches a stated 3200 RPM with a 15 amp rating, putting it in line with compact impact drivers built for repetitive fastening tasks rather than heavy-torque work.
Specifications
| Brand | DeWALT |
|---|---|
| Model | DCF850B |
| Dimensions & fit | |
| Item Weight | 0.01 Ounces |
| Capacity & performance | |
| Maximum Rotational Speed | 3200 rpmhigher than 61% of 71 impact drivers & wrenches |
| Speed | 3200 RPM |
| Drilling Capacity Wood | 0.2 inches |
| Drilling Capacity Metal | 0.2 inches |
| Power & efficiency | |
| Power Source | Battery |
| Voltage | 20 voltshigher than 54% of 171 impact drivers & wrenches |
| Amperage | 15 amps |
| Maximum Power | 300 watts |
| Construction & materials | |
| Material Type | Blend, Metal |
| Color | Yellow |
| Included components | |
| Included Components | Tool,Belt Hook |
| Warranty & support | |
| Manufacturer Warranty Description | Manufacturer Warranty |
| Other details | |
| Torque | 1700 in-lbhigher than 50% of 75 impact drivers & wrenches |
| Maximum Torque | 1700 in-lbhigher than 51% of 68 impact drivers & wrenches |
| Drill Type | Impact Driver |
| Is Electric | No |
| Item Type Name | Impact Driver |
| Additional Features | Variable Speed |
Closest rivals on specs
CRAFTSMAN CMCF801D1 1/4 in Impact Driver Kit- Maximum Rotational Speed 3200 vs 2900 rpm (+10%)
Frequently asked questions
What battery platform does the DEWALT DCF850B use?
DEWALT's 20 volt system, per the listed power source and voltage.
How fast does the DCF850B spin?
3200 RPM, per the listed spec.
How many DCF850B units sold recently?
200 in the past month.