DEWALT 20V MAX Circular Saw, Cordless Sidewinder Style Portable, 6-1/2-Inch Blade, 5150 RPM, 0-50 Degree Bevel Capability, Battery Not Included (DCS391B)

Description

DEWALT 20V MAX Circular Saw, Cordless Sidewinder Style Portable, 6-1/2-Inch Blade, 5150 RPM, 0-50 Degree Bevel Capability, Battery Not Included (DCS391B)

Product Overview

You need a compact, powerful circular saw that moves with your pace on job sites and in your shop. The DEWALT DCS391B gives you a high-speed 5150 RPM motor in a portable, sidewinder design so you can make clean, accurate cuts in lumber and sheet goods without being tethered to an outlet. The unit pairs a lightweight magnesium shoe with an optimized rubber over-molded grip so you get long-lasting durability plus the comfort and control required for precise work. This tool is built for professionals and committed DIYers who expect fast cutting, consistent beveling, and easy blade changes.

Key Benefits for You

• Power and speed: The 5150 RPM motor lets you slice through tough materials quickly while maintaining a smooth cut line.
• Portability: Battery-powered convenience lets you work where the cord won’t reach, giving you flexibility across sites.
• Precision and durability: The magnesium shoe resists wear for long-term cut accuracy, and the 0–50° bevel range gives you versatility on angled cuts.
• Ease of use: Keyless blade change and spindle lock make blade swaps faster and safer, keeping you on task.
• Comfort and control: The rubber over-molded grip is shaped to promote balance and reduce fatigue during extended use.

Product Specs

Feature	Specification
Motor Speed	5150 RPM
Blade Diameter	6-1/2 inches
Blade Teeth	18-tooth, carbide-tipped (included)
Bevel Capacity	0°–50°
Max Cut Depth @ 90°	2-1/8 inches (2.125 in)
Max Cut Depth @ 45°	1-5/8 inches (1.625 in)
Shoe Material	High-strength lightweight magnesium
Grip	Optimized rubber over-molded comfort grip
Blade Change	Keyless blade change with spindle lock
Warranty	3 Year Limited Warranty
Battery	Battery not included (20V MAX battery required)

What You Can Do With It

You can handle framing, trim work, and crosscuts in plywood, OSB, dimensional lumber, and many sheet goods. The 6-1/2-inch blade is a great balance between portability and cutting capacity, allowing you to make 2x material cuts at both 90° and 45°. With a 0–50° bevel range, you can produce aggressive angled cuts for custom trim, fascia, stair returns, and specialty joinery.

Who This Is For

• Contractors who need a fast, portable saw for framing, cabinetry, and finish framing.
• Carpenters and remodelers who value low weight without sacrificing durability.
• Enthusiastic woodworkers and hobbyists who want a dependable cordless option for shop or on-site work.
• Anyone upgrading older tools for better ergonomics, faster speeds, and more precise beveling.

In the Box

• DEWALT 20V MAX Circular Saw (DCS391B) — tool only
• 6-1/2-inch, 18-tooth carbide-tipped blade (installed)
• Blade wrench and accessories (if included by retailer—confirm at purchase) Note: Battery and charger are not included. Use DEWALT 20V MAX batteries and chargers (sold separately) for best performance.

Performance and Cutting Capacity

The 5150 RPM motor is tuned for high-speed cutting through common jobsite materials, offering rapid progress when you need to move fast. At 90°, you’ll get up to 2-1/8 inches of cutting depth, giving you the capacity to cut through standard 2x lumber in a single pass. When set to 45°, the saw maintains strong cutting ability with a 1-5/8 inch maximum depth, letting you achieve clean mitered edges and bevel joints without overheating the blade.

Ease of Use and Maintenance Tips

• Before first use, confirm the blade is tightened correctly and the spindle lock engages during blade changes.
• Use appropriate DEWALT 20V MAX battery packs for rated performance; higher-capacity packs deliver longer runtime per charge.
• Keep the shoe clean of pitch and debris to maintain accurate bevel and depth settings.
• Replace the carbide-tipped blade when cutting performance drops or burn marks appear on cut edges.
• Inspect the blade guard and ensure smooth movement before each shift to prevent binding and increase safety.
• Remove the battery when changing the blade or performing maintenance.

Safety Notes

You should always wear eye and hearing protection, dust masks, and appropriate gloves when operating this saw. Make sure both your hands are positioned on the grips when cutting and that the workpiece is securely clamped. Follow all listed safety instructions in the owner’s manual and ensure the blade guard is functioning properly before each use.

Battery and Runtime Considerations

This is a tool-only model, so you’ll need to supply a DEWALT 20V MAX battery. For demanding cuts and extended sessions, select a higher-capacity battery (e.g., XR packs) to increase cut quantity per charge. For lighter, quick tasks, a compact battery will keep the saw light and maneuverable while still providing sufficient power.

Warranty and Support

DEWALT backs this circular saw with a 3 Year Limited Warranty, providing coverage for manufacturing defects and performance issues under normal use. You can access service and support through DEWALT’s customer service channels, where you can also register the tool and check for authorized repair centers.

Frequently Asked Questions

• Will this saw cut through 2×4 lumber in a single pass?
  • Yes. With a maximum cut depth of 2-1/8 inches at 90°, you can cut standard 2x material in one pass.
• Is a blade included?
  • Yes. The saw ships with a 6-1/2-inch, 18-tooth carbide-tipped blade installed.
• Can you use other 20V MAX DEWALT batteries?
  • Yes. The saw is compatible with DEWALT 20V MAX batteries and chargers (sold separately).
• Is the blade change tool-free?
  • The unit features a keyless blade change with spindle lock for quicker swaps and safer handling.

Why You’ll Like It

You’ll appreciate the combination of speed, portability, and durability. The magnesium shoe helps this saw stay accurate over time, while the 5150 RPM motor tackles material with minimal fuss. Ergonomic touches like the rubber over-molded grip and keyless blade changes mean you spend less time fumbling and more time cutting. The adjustable bevel that reaches 50° expands what you can do without needing specialty tools.

If your work demands a reliable, cordless circular saw that balances performance and portability, this model gives you the core features professionals expect: speed, precise beveling, durable construction, and compatibility with a widely used battery platform. Add the DCS391B to your kit when you want swift, confident cutting power on every job.

DEWALT 20V MAX Circular Saw, Cordless Sidewinder Style Portable, 6-1/2-Inch Blade, 5150 RPM, 0-50 Degree Bevel Capability, Battery Not Included (DCS391B)

Make your cutting tasks faster, cleaner, and more portable with the DEWALT 20V MAX Circular Saw (DCS391B). This cordless sidewinder saw puts professional-level speed and control into your hands so you can take on framing, trim work, sheet goods and general woodworking without being tethered to a power outlet. You get a compact but powerful tool that balances lightweight handling with durable construction so your cuts stay precise over long days on the jobsite or around your home.

What this saw delivers for you

You get a 5150 RPM motor that provides the speed to push through demanding cuts while maintaining control. The magnesium shoe keeps the tool light yet stable, reducing fatigue and preserving long-term cut accuracy. With a 0–50° bevel range and a 6-1/2″ carbide-tipped blade included, you’ll make straight, bevel, and angled cuts into lumber and sheet goods with confidence. The unit ships as a bare tool (battery not included), so you can use it with any compatible 20V MAX battery you already own.

Key features at a glance

• High-speed 5150 RPM motor for fast, efficient cutting
• Magnesium shoe: high strength and lightweight for durability and accuracy
• 0–50° bevel capacity for aggressive bevel cuts and versatility
• 6-1/2″ 18-tooth carbide-tipped blade included for durable, smooth cutting
• Maximum cut depth at 90°: 2-1/8 inches (2.125 in)
• Maximum cut depth at 45°: 1-5/8 inches (1.625 in)
• Optimized rubber over-molded comfort grip for balance and control
• Keyless blade change with spindle lock for quick blade swaps
• 3 Year Limited Warranty for peace of mind
• Battery not included — use with DEWALT 20V MAX batteries

Product benefits — how this helps you get the job done

• Speed and power: The 5150 RPM motor lets you complete cuts faster, reducing time spent on each board and increasing overall productivity.
• Portability: Cordless operation means you can work where power isn’t available or when cords would be in the way.
• Durability: The magnesium shoe withstands jobsite conditions and helps maintain accurate cuts over time.
• Comfortable control: The rubber over-molded grip provides a secure hold and reduces vibration so you can work longer with less fatigue.
• Versatility: A wide 0–50° bevel range lets you handle trim, molding, and more complex angled cuts without switching tools.
• Convenience: The included blade and keyless blade change let you get started quickly and change blades safely and efficiently.

Ideal uses for this saw

• Cutting plywood, OSB, and sheet goods for framing and subflooring
• Rip and cross cuts on dimensional lumber for rough carpentry
• Angle and bevel cuts for trim work and fascia
• Portable cuts on job sites where cord access is limited
• DIY projects, deck framing, and construction tasks where mobility and speed matter

Technical specifications

Specification	Details
Model	DCS391B
Power System	DEWALT 20V MAX (battery not included)
Motor Speed	5150 RPM
Blade Size	6-1/2 inch (165 mm)
Blade Teeth	18-tooth carbide-tipped blade (included)
Bevel Capacity	0–50 degrees
Max Cut Depth @ 90°	2-1/8 inches (2.125 in)
Max Cut Depth @ 45°	1-5/8 inches (1.625 in)
Shoe Material	Magnesium
Grip	Rubber over-molded comfort grip
Blade Change	Keyless with spindle lock
Warranty	3 Year Limited Warranty
Weight	(bare tool) — lightweight sidewinder design
Battery	Battery not included; compatible with DEWALT 20V MAX batteries

What’s in the box

• DEWALT 20V MAX Circular Saw (DCS391B) — bare tool
• 6-1/2″ 18-tooth carbide-tipped blade (installed)
• Operator manual and warranty documentation

Safety and usage tips

• Always use an appropriate DEWALT 20V MAX battery rated for the tool and secure it properly before operation.
• Wear eye and hearing protection, and use a dust mask when cutting dusty materials.
• Check blade condition before use; replace if teeth are damaged or worn to maintain cut quality and safety.
• Support cut material adequately to prevent binding, kickback, or inaccurate cuts.
• Make sure blade guards move freely and are not obstructed.
• Follow all safety instructions in the operator manual. Proper technique and secure workholding reduce the risk of accidents.

Maintenance guidance

• Keep the shoe and base plate clean to maintain accurate alignment.
• Inspect and tighten fasteners periodically.
• Clean dust from vents to prevent motor overheating.
• Replace blades with compatible 6-1/2″ carbide-tipped blades to maintain performance.
• Store the tool in a dry place and remove the battery before long-term storage.

Frequently asked questions

Q: Is the battery included?
A: No, this model is sold as a bare tool (battery not included). Use it with your DEWALT 20V MAX batteries.

Q: Can this saw handle plywood and OSB?
A: Yes. The 6-1/2″ carbide-tipped blade and 5150 RPM motor make it suitable for plywood, OSB, and other sheet goods as well as dimensional lumber.

Q: How deep will it cut?
A: Maximum cut depth at 90° is 2-1/8 inches (2.125 in). At 45° the maximum cut depth is 1-5/8 inches (1.625 in).

Q: Does it have a bevel function?
A: Yes. The saw offers a 0–50° bevel capability for angled cuts.

Q: Is the blade easy to change?
A: Yes. It features a keyless blade change with spindle lock, so you can swap blades quickly and safely.

Warranty and support

This product includes a 3 Year Limited Warranty from DEWALT. If you need technical support, replacement parts, or warranty service, contact DEWALT customer service or visit the DEWALT website for assistance and authorized service centers.

Why this is a practical choice for your toolkit

You’ll appreciate a compact circular saw that balances power and maneuverability. The sidewinder design provides a lightweight footprint while delivering a high RPM motor for fast cutting. If you already own DEWALT 20V MAX batteries, this unit integrates into your existing system and gives you one less cord to manage at the jobsite. Whether you’re a professional who needs a reliable portable saw for framing and trim, or a DIYer tackling weekend projects, this saw helps you finish cuts faster and cleaner with less hassle.

Ready to add a portable, powerful circular saw to your kit? Select the DEWALT 20V MAX Circular Saw (DCS391B) and outfit it with the DEWALT 20V MAX battery of your choice to get started.

Disclosure: As an Amazon Associate, I earn from qualifying purchases.