DEWALT Atomic DCF809B 20V Max Impact Driver
- 20 volt MAX brushless compact impact driver, quarter inch
- 1700 inch pounds of torque, a second field says 1825
- 3 speeds with variable speed
- DEWALT 20V MAX batteries listed as compatible
- 6.35 millimeters maximum chuck size
- 2.16 pounds
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A brushless compact impact driver for DEWALT 20V MAX batteries, with three speeds and high torque. The listing contains conflicting torque figures and a speed unit that makes no sense.
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ASIN: B07QJ96V1SModel: DCF809BCategory: Impact Drivers & Wrenches
Overview
Driving long fasteners with rotational impacts is what this DEWALT driver does, running from a lithium-ion battery on a brushless motor. A variable speed trigger and three speed settings control how it starts and finishes.
Brushless power and three speeds make it a flexible driver for framing, decking and cabinet work, and it shares packs with the 20V MAX line. The limitation is a messy listing: torque is given twice with different numbers, and the maximum speed unit is garbled.
Who it's for
A deck, framing or cabinet job with many long screws suits a compact impact driver. Buyers without 20V MAX batteries would need to add one, and anyone drilling large holes should consider a drill.
Pros and cons
- Three speed settings
- Works with DEWALT 20V MAX batteries
- Drilling capacity listed
- Torque figures conflict
- Maximum speed unit unclear
- Battery not named as included
Performance notes
An impact driver adds rapid hammering turns when resistance rises, so long fasteners seat without wrist strain. The three speed settings and variable trigger let the user drive slowly to avoid stripping. Runtime follows the battery pack in use.
Specifications
| Brand | DeWALT |
|---|---|
| Model | DCF809B |
| Dimensions & fit | |
| Maximum Chuck Size | 6.35 millimeters |
| Item Dimensions L X W X H | 8 inches long x 6 inches wide x 2.5 inches high |
| Item weight | 2.16 pounds |
| Capacity & performance | |
| Drilling Capacity Wood | 5.35 millimeters |
| Drilling Capacity Metal | 0.24 inches |
| Battery Capacity | 1.3 amp hours |
| Number Of Speeds | 3 |
| Maximum Rotational Speed | 9200 rpw |
| Power & efficiency | |
| Voltage | 20 voltshigher than 54% of 135 impact drivers & wrenches |
| Maximum Power | 300 watts |
| Battery Type | Lithium Ion |
| Amperage | 16 Amps |
| Power Source | Battery Powered |
| Construction & materials | |
| Color | Multi |
| Material Type | Blend |
| Compatibility & installation | |
| Compatible Devices | DEWALT 20V MAX batteries |
| Warranty & support | |
| Manufacturer Warranty Description | no |
| Other details | |
| Torque | 1825 inch pounds |
| Maximum Torque | 1700 inch pounds |
| Drill Type | Impact Driver |
| Additional Features | Variable Speed |
| Is Electric | Yes |
Closest rivals on specs
Frequently asked questions
Which batteries fit the DEWALT DCF809B?
The listing names DEWALT 20V MAX batteries as compatible.
How much torque does the DEWALT DCF809B have?
The listing gives 1700 inch pounds as maximum torque, and a second field says 1825 inch pounds. Treat the figure as approximate.
What is included with the DEWALT DCF809B?
The included component is the DCF809 20V MAX brushless compact quarter inch impact driver.
How fast does the DEWALT DCF809B spin?
The listing gives a maximum speed in an unclear unit, so the figure cannot be relied on.