Features
- Compact design (under 4 in.) for access to tight or hard-to-reach areas
- Brushless motor yielding up to 1,825 in-lb max torque and up to 3,250 RPM
- Variable 3-speed trigger for improved control and precision
- Integrated 3-LED work light to improve visibility in dim conditions
- Includes belt hook
Specifications
Battery Capacity [Ah] | 5 |
Battery Chemistry | Lithium Ion |
Battery Type | Lithium Ion |
Battery Voltage [V] | 20 |
Color | Yellow |
Has Led Light? | Yes |
Impact Rate Per Min. | 3800 |
Is It A Set? | No |
Max. Torque [In Lbs] | 1825 |
No Load Speed [Rpm] | 3250 |
Number Of Pieces | 2 |
Number Of Speed Settings | 3 |
Power Source | Cordless |
Product Weight Gross [Lbs] | 4 |
Product Weight [Lbs] | 2.1 |
Tool Length [In] | 3.97 |
Includes | Tool, Belt Hook |
Battery & Charger | Sold separately |
Warranty | 3 Year Limited Warranty; 1 Year Free Service; 90 Days Satisfaction Guaranteed |
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Compact 1/4-inch brushless impact driver designed for use in tight spaces. It provides up to 1,825 in-lb of max torque and up to 3,250 RPM for driving large-diameter screws. The tool has a variable 3-speed trigger for control and includes an integrated 3-LED work light. Battery and charger are sold separately; one belt hook is included.
DeWalt 20V MAX 1/4 in. 3-Speed Brushless Impact Driver (Tool Only) Review
As someone who has spent considerable time working with a variety of power tools, I recently had the opportunity to put the DeWalt 20V MAX* Brushless Cordless 3-Speed 1/4 in. Impact Driver (DCF850B) through its paces. DeWalt has a long-standing reputation for producing reliable and powerful tools, and I was eager to see if this compact impact driver would live up to the brand's high standards.
Design and Build Quality
The first thing that struck me about this impact driver is its incredibly compact design. Measuring just under 4 inches, it’s one of the smallest impact drivers I’ve encountered. This compact size is a significant advantage, especially when working in tight spaces like cabinetry or framing. The tool feels well-balanced and fits comfortably in hand, thanks to its ergonomic design and soft rubber grips. The build quality is robust, as one would expect from DeWalt, with a sturdy exterior that feels like it can withstand the rigors of a busy job site.
Performance and Power
Despite its small size, the DCF850B packs a punch. The brushless motor delivers an impressive 1,825 in-lbs of torque and a maximum speed of 3,250 RPM. This level of power is more than adequate for driving large screws and handling other demanding tasks. The impact driver features a variable 3-speed trigger, which provides enhanced control over the tool. The three-speed settings allow for versatility in different applications, from delicate cabinetry work to heavy-duty framing.
However, I did notice that the lowest speed setting (Speed 1) seems to lack the necessary power for driving screws effectively. It’s suitable for very light tasks but struggles with anything more substantial. The middle and high settings (Speeds 2 and 3) performed admirably, delivering the power needed for most tasks. Speed 3, in particular, is quite powerful and can handle even the most stubborn screws with ease.
Usability and Features
One of the standout features of this impact driver is the integrated 3-LED work light. This is a game-changer when working in dimly lit areas, providing excellent visibility and reducing the need for an additional work light. The tool also features a quick-change chuck, which makes switching out bits fast and straightforward. This feature is particularly useful when moving between different tasks, as it saves valuable time.
The tool’s lightweight design, especially when paired with a compact 1.3Ah battery, makes it easy to handle and reduces fatigue during extended use. However, for more power-intensive tasks, the 5Ah battery is a better choice, albeit with a slight increase in weight.
Durability and Reliability
While the DCF850B excels in many areas, its durability and reliability have been a mixed bag in my experience. During my testing, I encountered some issues with the tool’s longevity. After a few months of use, the motor began to show signs of wear, and the tool occasionally failed to deliver consistent power. This is concerning, especially given DeWalt’s reputation for durable tools. It’s worth noting that DeWalt offers a warranty, but the inconvenience of having to send the tool in for repairs can be frustrating.
Pros and Cons
Pros:
- Compact Design: The small size makes it perfect for tight spaces.
- Powerful Performance: High torque and RPM make it suitable for heavy-duty tasks.
- 3-Speed Settings: Offers versatility for different applications.
- Integrated LED Work Light: Provides excellent visibility in low-light conditions.
- Quick-Change Chuck: Makes bit changes fast and easy.
Cons:
- Durability Concerns: Issues with motor longevity and reliability.
- Underpowered Low Speed: The lowest speed setting lacks sufficient power for many tasks.
- Inconsistent Performance: Occasional power delivery issues.
Final Thoughts
The DeWalt 20V MAX* Brushless Cordless 3-Speed 1/4 in. Impact Driver is a tool that offers a lot in terms of power, compactness, and usability. Its design makes it incredibly versatile, and the integrated features like the LED work light and quick-change chuck add to its overall appeal. However, the durability and reliability issues I encountered are hard to overlook.
Would I recommend this tool? It depends on your needs. If you’re a professional who requires a reliable impact driver for daily heavy-duty use, you might want to consider other options or at least be prepared for potential downtime due to repairs. On the other hand, if you’re a DIY enthusiast or a professional who needs a compact, powerful tool for occasional use, the DCF850B could be a great addition to your toolkit.
In conclusion, the DeWalt DCF850B shines in many areas but falls short in others. It’s a tool with tremendous potential, but its inconsistent performance and durability concerns prevent it from being an unequivocal recommendation. If DeWalt addresses these issues in future iterations, it could very well become a top choice for impact drivers in its class.
Project Ideas
Business
Cabinet and Hardware Upgrade Micro-Service
Offer flat-rate replacement of cabinet knobs/pulls, door hinges, and soft-close add-ons. The compact driver fits inside cabinets; speed 1 and the LED prevent overdriving and misalignment. Upsell layout templates, premium hardware, and batching discounts for whole-home upgrades.
Mobile Flat-Pack Assembly and Anchoring
Provide on-site assembly for furniture, closets, and storage systems with optional wall anchoring. Use the 3-speed control for delicate cam/confirmat screws and the torque for lagging safety anchors into studs. Target apartments and offices; bundle per-room pricing and rapid turnaround.
Deck, Fence, and Exterior Screw Replacement
Specialize in swapping rusted fasteners with coated or stainless screws and tightening loose boards/railings. The brushless impact powers long structural screws and ledger lags; the LED helps under decks and at dusk. Offer seasonal inspections, per-linear-foot pricing, and bulk hardware packages.
Rental Turnover Punch-List Fastenings
Be the go-to for landlords to handle quick fixes: rehang cabinet faces, tighten door strikes, install blinds, towel bars, shelves, and closet tracks. The compact form reaches tight corners; three speeds protect finishes. Sell 2-hour and 4-hour service blocks with same-day availability.
Event and Retail Fixture Setup Crew
Set up and tear down booths, shelving, and signage that require hundreds of fasteners on tight timelines. The 3,250 RPM and 3,800 IPM speed repetitive assembly, while the belt hook keeps the driver handy on ladders. Market to exhibit houses and pop-up retailers; bill by day-rate with rush fees.
Creative
Shadow-Line Floating Shelves with Exposed Fasteners
Build minimalist floating shelves that intentionally showcase black structural screws as a design detail. Use the compact 3.97 in. head to drive ledger screws between tight studs and the 3-speed trigger to avoid overdriving into drywall. The LED helps align pilot holes in dim hallways, and the 1,825 in-lb torque handles long structural screws for a rock-solid mount.
Modular Cube Storage Wall
Create interlocking plywood cubes fastened with confirmat or structural screws for a custom storage wall. High torque speeds through long fasteners; switch to low speed for face frames and delicate edges. The short body fits inside cubes to secure hidden connectors, while the work light keeps layout lines visible.
Industrial Entry Bench and Coat Rack
Combine reclaimed timber with black pipe and oversized washer-head screws for an industrial entry set. The driver’s compact size reaches under the bench and behind the backer board to sink lags into studs, and the three speeds keep you from crushing softwoods. Add a grid of visible screws for a bold, functional aesthetic.
Vertical Planter Slat Wall
Build a backyard slat wall with modular planter boxes mounted using stainless exterior screws. The brushless motor’s torque drives exterior-rated screws into pressure-treated lumber; the LED is handy at dusk. Use speed 1 to avoid stripping in softer cedar and speed 3 for long structural connections.
Acoustic Slat Wall Panels
Assemble acoustic panels (felt backing + wood slats) and secure them with a clean, rhythmic grid of black screws for a studio or home theater. Speed 3 handles repetitive fasteners quickly; drop to speed 1 to finish flush without marring the slats. The compact tool fits near corners and tight returns.