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DEWALT 20V MAX Circular Saw, Cordless Sidewinder vs FLEX 24V Brushless Cordless 6-1/2-Inch In-Line

Updated July 2026 — DEWALT 20V MAX Circular Saw, Cordless Sidewinder wins on price, FLEX 24V Brushless Cordless 6-1/2-Inch In-Line wins on power and runtime.

The DEWALT 20V MAX Circular Saw offers excellent value and portability, while the FLEX 24V excels in power and cutting capacity.

Why DEWALT 20V MAX Circular Saw, Cordless Sidewinder is better

Price

DEWALT is $48.66 cheaper

Weight

DEWALT is lighter

Warranty

DEWALT has a 3-year warranty

Why FLEX 24V Brushless Cordless 6-1/2-Inch In-Line is better

Power

FLEX has a 20% power increase

Cutting Capacity

FLEX can cut 3x lumber in one pass

Runtime

FLEX can make up to 430 cuts in 2x4 lumber

Overall score

DEWALT 20V MAX Circular Saw, Cordless Sidewinder
75
FLEX 24V Brushless Cordless 6-1/2-Inch In-Line
85

Specifications

SpecDEWALT 20V MAX Circular Saw, Cordless SidewinderFLEX 24V Brushless Cordless 6-1/2-Inch In-Line
Motor RPM5150N/A
Bevel Capacity0-50°N/A
Blade Size6-1/2 inch6-1/2 inch
Battery Type20V24V
Max Cut Depth2-1/8 inches2-9/16 inches

Dimension comparison

DEWALT 20V MAX Circular Saw, Cordless SidewinderFLEX 24V Brushless Cordless 6-1/2-Inch In-Line

Introduction to Circular Saws

When it comes to circular saws, two strong contenders are the DEWALT 20V MAX Circular Saw and the FLEX 24V Brushless Cordless In-Line Circular Saw. Both of these tools are designed for performance and durability, but they cater to different user needs. The DEWALT is priced at $129.00, while the FLEX comes in at $177.66, making the DEWALT about 27% cheaper. This price difference sets the stage for a detailed comparison of their features, performance, and suitability for various tasks.

Power and Performance

The DEWALT 20V MAX Circular Saw is equipped with a powerful 5150 RPM motor, delivering the speed necessary for demanding cuts. In contrast, the FLEX 24V Brushless model boasts a 20% increase in power due to its 24V lithium battery, offering superior performance for challenging tasks. Each tool is built to handle rigorous cutting demands, but the DEWALT may appeal to users seeking a lightweight option without compromising on speed. With its advanced motor technology, the FLEX also promises a longer runtime, making it ideal for extended projects.

Design and Ergonomics

In terms of design, the DEWALT features a lightweight magnesium shoe that enhances durability while maintaining optimal balance and control. The rubber over-molded grip adds comfort, making it easier to handle, especially during prolonged use. The FLEX, on the other hand, introduces the world's first in-line circular saw design. This unique configuration provides an exceptional balance and clear visibility on both sides of the blade, which can be beneficial for precise cuts. Users may prefer the DEWALT for its traditional design or the FLEX for its innovative approach, depending on their cutting style.

Cutting Capacity

The DEWALT Circular Saw has a cutting depth of 2-1/8 inches at 90 degrees and 1-5/8 inches at 45 degrees. This allows for versatility in various applications, from lumber to sheet goods. The FLEX excels in cutting capacity, boasting the ability to cut through 3x lumber in one pass with a maximum depth of 2-9/16 inches. This feature may be particularly appealing for users who frequently work with thicker materials. The difference in cutting capabilities highlights the strengths of each tool in specific scenarios.

Battery and Runtime

Battery performance is a crucial factor for cordless tools. The DEWALT 20V MAX model does not include a battery or charger, which can be an additional expense for users new to the brand. In contrast, the FLEX 24V model also requires a separate battery and charger, but it advertises exceptional runtime, with the ability to make up to 430 cuts in 2x4 lumber with a 5.0Ah battery. This advantage may sway users who prioritize runtime and efficiency in their projects, despite the higher price tag.

Warranty and Support

Warranty coverage can offer peace of mind when investing in power tools. The DEWALT 20V MAX Circular Saw comes with a 3-year limited warranty, providing users with reliable support for their purchase. The FLEX offers a more generous 5-year limited warranty if registered within 30 days of purchase, or a 3-year warranty without registration. This extended coverage reflects FLEX's confidence in its product's durability and could influence buyers looking for long-term reliability.

Ideal Use Cases

The DEWALT 20V MAX Circular Saw is well-suited for woodworking and construction jobs that require portability and precise cuts. Its lightweight design and balance make it an excellent choice for users who need a reliable saw for various tasks. Conversely, the FLEX 24V Brushless Circular Saw shines in scenarios requiring maximum cutting capacity and runtime. Users tackling larger projects or frequently cutting thicker materials may find the FLEX to be the better option due to its superior power and efficiency.

Which should you buy?

Choosing between the DEWALT 20V MAX Circular Saw and the FLEX 24V Brushless Cordless In-Line Circular Saw ultimately depends on your specific needs and budget. The DEWALT, priced at $129.00, offers an excellent balance of power, lightweight design, and a solid warranty, making it suitable for general woodworking and construction tasks. On the other hand, the FLEX, at $177.66, provides advanced features such as increased power, greater cutting capacity, and a longer runtime, which may justify the higher price for users requiring more robust performance. Consider your typical projects and preferences to make an informed decision.