DEWALT DCF840B 20V Max Brushless Impact Driver
- 1700 inch pounds torque
- 3200 RPM, variable speed
- 20 volts, 15 amps listed
- 300 watts maximum power
- 0.25 inch wood and **0.24 inch** metal capacity
- Belt hook included
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A yellow cordless impact driver with variable speed and a belt hook, listed without a battery. The weight and electric entries look wrong.
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ASIN: B09MLL4G3GModel: DCF850BCategory: Impact Drivers & Wrenches
Overview
A trades user or serious DIYer gets a yellow impact driver here that spins variable speed rotational impacts into fasteners. The body is a blend of metal and plastic, and a belt hook comes with the tool.
The reason to look at it is the strong torque rating in a compact driver. The limitation is that the listing contains some obvious errors, including the weight entry.
Who it's for
A builder or mechanic driving deck screws and bolts who has a compatible battery. A first-time buyer should compare a kit that includes power.
Pros and cons
- High torque rating
- Belt hook included
- Compact driver form
- Battery not included
- Weight entry looks wrong
- Electric entry conflicts
Performance notes
The impact mechanism hammers the bit as resistance grows, so fasteners seat without stalling the motor. Variable speed allows gentler starts, and capacity limits apply to small drilling jobs.
Specifications
| Brand | DeWALT |
|---|---|
| Model | DCF850B |
| Dimensions & fit | |
| Item Weight | 0.01 Ounces |
| Capacity & performance | |
| Maximum Rotational Speed | 3200 RPMhigher than 54% of 36 impact drivers & wrenches |
| Drilling Capacity Wood | 0.25 inches |
| Drilling Capacity Metal | 0.24 inches |
| Power & efficiency | |
| Voltage | 20 voltshigher than 54% of 135 impact drivers & wrenches |
| Amperage | 15 amps |
| Maximum Power | 300 watts |
| Power Source | Battery Powered |
| Construction & materials | |
| Color | Yellow |
| Material Type | Blend, Metal |
| Included components | |
| Included Components | Tool, belt hook |
| Warranty & support | |
| Manufacturer Warranty Description | Manufacturer warranty |
| Other details | |
| Torque | 1700 inch pounds |
| Drill Type | Impact driver |
| Additional Features | Variable speed |
| Is Electric | No |
Closest rivals on specs
RYOBI PCL235B ONE+ 18V 1/4 in Impact Driver- Voltage 20 vs 18 volts (+11%)
RYOBI ONE+ HP PBLID02B 18V Brushless Impact Driver- Maximum Rotational Speed 3200 vs 2900 RPM (+10%)
- Voltage 20 vs 18 volts (+11%)
PORTER-CABLE PCC641LB 20V Max Impact Driver Kit- Maximum Rotational Speed 3200 vs 2800 RPM (+14%)
Frequently asked questions
How do I attach the DEWALT DCF850B belt hook?
The listing includes a belt hook but gives no attachment steps.
Does the DEWALT DCF850B come with a battery?
The included components list the tool and a belt hook only.
Is the weight of the DEWALT DCF850B listed?
The listing shows 0.01 ounces, which looks like an error.