DeWALT DCS391B Review 2025: A Proven Workhorse or Outdated Classic?
The DeWALT DCS391B is a 20V MAX cordless 6-1/2-inch circular saw that has earned a long-standing reputation for reliability and value. Built with a magnesium shoe and a solid 5,200+ RPM motor, it remains a strong choice for both pros and hobbyists in 2025.
However, it’s still based on brushed motor technology, meaning you’ll give up some runtime and braking performance compared to newer brushless models like the DCS565 or DCS570.
Related: Makita XS002Z Review 2025
Table of Contents
What’s Changed for 2025
While the saw’s hardware hasn’t evolved, the market around it has. DEWALT has shifted attention toward brushless XR and Power Detect tools, leaving the DCS391B as a solid, affordable performer for those who just want something reliable that gets the job done.
In 2025, that makes it a budget-friendly pro tool for builders, remodelers, and DIY users who don’t need cutting-edge electronics.
Key Specifications for Dewalt DCS391B
DeWALT DCS391B 20V MAX cordless circular saw — lightweight, powerful, and accurate for woodworking and home construction.
Buy Now On Amazon
| Feature | DeWALT DCS391B |
|---|---|
| Power Source | 20V MAX Battery (Tool-Only) |
| Blade Diameter | 6-1/2″ |
| Arbor Size | 5/8″ |
| No-Load Speed | 5,150–5,250 RPM |
| Bevel Range | 0° to 50° |
| Depth of Cut at 90° | 2-1/4″ |
| Depth of Cut at 45° | 1-5/8″ |
| Shoe Material | Magnesium |
| Weight (Bare Tool) | 7.2 lbs |
| Motor Type | Brushed |
| Electric Brake | Yes |
Build Quality and Design
Magnesium Shoe – Light Yet Durable
The magnesium base is a real highlight of this model. It’s lighter than steel but stronger than standard aluminum, keeping the saw rigid and stable over years of use. This rigidity directly affects cut accuracy, and the DCS391B holds calibration impressively well.
Related: Download Woodworking book + 40 Free Woodworking Plans
Compact and Balanced
At just over 7 pounds, the tool feels balanced in the hand—even with a 5.0Ah battery attached. The grip ergonomics and rubber overmold make long cutting sessions surprisingly comfortable.
Sight Lines and Guard Movement
The left-blade design gives a clear line of sight to the cut. The lower guard moves smoothly without catching, and the bevel lock has a firm, confident feel—important for repeatable angle cuts.
Performance: Power and Precision
The DCS391B spins at roughly 5,200 RPM, giving it solid speed for ripping sheet goods, framing lumber, or trimming boards.
It doesn’t match the raw torque of newer brushless saws, but with the right blade, it cuts cleanly through 2x material, plywood, and OSB without bogging down.
Real Use Feel
Users often describe this saw as “predictable and consistent”. There’s enough power to handle standard construction lumber, and it rarely binds unless you force the cut.
Feed the saw steadily, keep the blade sharp, and it performs nearly as well as many newer (and more expensive) models.
Bevel and Depth Adjustments
- Bevel capacity: up to 50°, with solid locking.
- Max cut depth @ 90°: 2-1/4″ (clean one-pass cuts through 2x lumber).
- Max cut depth @ 45°: 1-5/8″, suitable for most bevel trim and fascia cuts.
The scale is clear and easy to read, and the adjustments stay tight—no wobble or drift, even after a few months of job-site bumps.
Power System and Battery Compatibility
The DCS391B runs on the DEWALT 20V MAX platform, meaning it works with all existing 20V batteries from 2.0Ah up to 9.0Ah FlexVolt packs.
- For best balance and runtime, pair it with a 5.0Ah pack.
- For maximum endurance, use FlexVolt 6.0Ah or 12.0Ah batteries.
While the saw’s brushed motor isn’t as efficient as newer models, it still offers strong torque and predictable runtime with high-capacity packs.
Brushed vs. Brushless: Does It Matter?
Brushless tools like the DCS565 are quieter, more efficient, and deliver longer runtime. However, the DCS391B’s brushed design keeps it simpler, lighter, and cheaper to maintain.
If you only use a circular saw occasionally or as a secondary tool, the difference won’t affect your workflow much. If you’re cutting daily on job sites, consider upgrading to a brushless model for better longevity and braking response.
Blade Selection: Unlocking Its Full Potential
The right blade makes or breaks this saw’s performance. Consider these combinations:
- Framing: 24T–28T thin-kerf carbide blade
- Sheet goods: 40T–48T plywood/finish blade
- Laminate & MDF: 60T+ ultra-fine blade
- General use: DEWALT 6-1/2″ 24T construction blade
Upgrading from the stock blade can instantly improve cut quality and battery life by reducing drag.
Real-World Applications
1. DIYers and Home Projects
Perfect for building decks, cutting plywood, shelving, and general repair work. Lightweight, affordable, and easy to control.
Related: Build a bookshelf from plywood
2. Professional Carpenters and Remodelers
Ideal as a backup or travel saw. Its light frame and quick setup make it a handy option for trim and small framing work.
3. Workshop Builders
Pair it with a straightedge guide or rip fence for accurate plywood breakdowns without a table saw.
Pros and Cons
Pros
- Lightweight and well-balanced for all-day use
- Strong magnesium shoe for long-term accuracy
- 50° bevel adds cutting flexibility
- Excellent value for the money
- Reliable DEWALT 20V ecosystem compatibility
Cons
- Brushed motor = slightly less runtime and efficiency
- 6-1/2″ blade limits cut capacity compared to 7-1/4″ models
- No integrated LED light or dust collection port
- Sold as tool-only (no battery or charger included)
Comparisons (2025 Lineup)
DCS391B vs DCS565 (Brushless 6-1/2”)
| Feature | DCS391B | DCS565 |
|---|---|---|
| Motor | Brushed | Brushless |
| Speed | 5,250 RPM | 4,950 RPM |
| Weight | Lighter | Slightly heavier |
| Efficiency | Moderate | High |
| Price | Lower | Higher |
| Verdict | Great budget choice | Best all-around 6-1/2″ option |
DCS391B vs DCS570 (XR 7-1/4”)
| Feature | DCS391B | DCS570 |
|---|---|---|
| Blade Size | 6-1/2″ | 7-1/4″ |
| Motor | Brushed | Brushless XR |
| Max Depth | 2-1/4″ | 2-9/16″ |
| Power | Moderate | Stronger |
| Weight | Lighter | Heavier |
| Verdict | Compact & portable | Pro-grade saw for daily framing |
Maintenance and Setup Tips
- Check Blade Guard Movement monthly to ensure smooth return.
- Tighten Bevel Locks occasionally to maintain accuracy.
- Blow Out Dust from vents to prevent overheating.
- Use Dry Storage – even treated magnesium can corrode with prolonged moisture.
- Recalibrate Depth Stops every few months for precise cuts.
Price and Value
In 2025, the DCS391B typically sells between $120–$160 (tool-only), depending on location and promotions. For the price, it’s one of the best mid-tier circular saws still in production.
While newer XR models are more advanced, the DCS391B continues to deliver durability, consistency, and solid power without breaking the bank.
Verdict: Still a Top Pick for Value in 2025
The DeWALT DCS391B remains a fantastic buy for anyone who wants a reliable, lightweight circular saw that’s proven to last.
If you’re already invested in the 20V MAX ecosystem, it’s a no-brainer. It’s not the most advanced or efficient, but for most users, it’s more than enough saw for the money.
✅ Ideal for: DIYers, woodworkers, contractors needing a secondary saw
🚫 Not ideal for: Heavy daily framing or precision finish carpentry
Final Rating: ★★★★☆ (4.4 / 5)
Still powerful, still dependable — and in 2025, still worth owning.
Is the DeWALT DCS391B brushless?
No. The DCS391B uses a brushed motor, which makes it slightly less efficient than the newer brushless XR models. However, it’s proven to be durable, simple to maintain, and far more affordable.
What battery works with the DeWALT DCS391B?
The DCS391B runs on the DeWALT 20V MAX platform. It’s compatible with all standard 20V MAX and FlexVolt 20V/60V batteries. For best performance, use a 5.0Ah or larger battery.
Does the DCS391B have an electric brake?
Yes. The saw includes a basic electric brake that quickly stops the blade after the trigger is released. It’s not as fast as the newer XR models but still adds a useful layer of safety.
What is the cutting depth of the DCS391B?
At 90 degrees, it cuts up to 2-1/4 inches, which easily handles standard 2x lumber. At 45 degrees, the depth is about 1-5/8 inches—enough for bevel cuts and trim work.
Is the DCS391B good for professionals?
Yes, but with limits. It’s ideal for light to medium-duty work, job-site cutting, and remodeling tasks. Heavy framing crews may prefer brushless or 7-1/4″ models like the DCS570 or DCS574 for more power and runtime.
What type of blade does the DCS391B use?
It takes any 6-1/2 inch circular saw blade with a 5/8 inch arbor. For best results, use carbide-tipped thin-kerf blades—24T for framing, 40T–60T for fine finish or plywood cuts.
What’s the price range for the DeWALT DCS391B in 2025?
As of 2025, the DCS391B typically retails between $120 and $160 (tool-only). Pricing can vary by retailer and seasonal promotions.
Is it worth buying the DCS391B in 2025?
Yes. It’s still a great value for its price, offering reliable performance, accuracy, and compatibility with all 20V MAX batteries. If you don’t need brushless power or 7-1/4″ capacity, the DCS391B remains a smart, dependable choice.
Leave a Reply