DEWALT 20V MAX Cordless 4 Review: Who It Fits and Who Should Skip It

What stands out

• Brushless motor delivers up to 9,000 RPM for fast cutting
• Anti-rotation safety features include a Kickback Brake and E-Clutch
• Lightweight bare tool weighs only 3.55 lbs to reduce fatigue
• Slide-switch allows for easy and responsive power control
• Kit includes battery and charger for immediate use

Who it fits

Key specs explained for this grinder

Motor Type: Brushless

A brushless motor uses electronic control instead of physical brushes to switch current. This design reduces friction and wear, allowing the tool to run cooler for longer periods. You will likely see extended motor life and better efficiency compared to brushed models. It also helps maintain consistent power output as the battery drains, making it a reliable choice for frequent use.

No-Load Speed: 9,000 RPM

This number indicates how fast the grinding wheel spins when the tool is running without cutting any material. A speed of 9,000 RPM provides high cutting velocity, which helps you slice through metal quickly. Higher RPMs generally mean faster material removal. You should match this speed to the recommended limits of your cutting discs to ensure safe and effective operation during heavy-duty tasks.

Wheel Diameter: 4-1/2 in.

This measurement defines the size of the abrasive discs or cutting wheels the grinder accepts. A 4-1/2 inch diameter is the standard size for general-purpose angle grinders. It offers a good balance between cutting depth and maneuverability. You will find a wide variety of compatible discs for this size, making it easy to replace worn parts and adapt the tool for different cutting or grinding applications.

Power Source: 20V MAX cordless

The tool operates on a 20-volt lithium-ion battery system rather than a wall outlet. This cordless design gives you the freedom to work in areas without nearby power sources. You can move around your job site without managing extension cords. The 20V MAX platform is common, meaning you can likely use batteries from other compatible tools in your collection, adding versatility to your workflow.

Switch Type: Slide

The power switch is a sliding mechanism rather than a trigger or button. This type of switch stays in the on position once engaged, freeing your finger for other tasks. You do not need to keep constant pressure on the switch to maintain operation. This feature can reduce hand fatigue during long periods of continuous grinding or cutting, providing a more comfortable user experience.

Design and build details

The DEWALT DCG407P1 kit features a black and yellow finish, a color scheme that aligns with the brand’s standard industrial aesthetic. According to the listing, the tool weighs 3.55 pounds as a bare unit. This lightweight construction helps reduce fatigue during extended use, making it suitable for overhead work or prolonged cutting tasks. The compact size of the 4-1/2 inch grinder allows for better maneuverability in tight spaces compared to larger, heavier models.

Controls are managed via a slide-switch, which offers a straightforward activation method. This type of switch is often preferred for its simplicity and ease of use, especially when wearing gloves. The ergonomic design is intended to fit comfortably in your hand, allowing for precise control while grinding or cutting. The layout is minimal, focusing on essential functions without unnecessary clutter.

Safety is integrated into the design through anti-rotation features. The kickback brake and E-clutch are engineered to protect you during unexpected binding or sudden resistance. These features are critical for maintaining control when cutting tough materials like rebar. The brushless motor is housed within a durable casing, designed to withstand the rigors of job site use. The inclusion of a battery and charger in the kit ensures you have the power source ready to go, supporting the tool’s cordless operation.

Setup And Daily Use Overview

You begin setup by inserting the 20V MAX battery into the grinder. The kit includes both the battery and the charger, so you have the necessary power source ready for immediate use. This cordless design removes the need for extension cords or air hoses, allowing you to move freely around your workspace without tripping hazards or pressure drops.

For daily operation, the tool features a slide-switch. This control mechanism allows you to engage or disengage the motor with a simple sliding motion. It is generally faster and more convenient than a trigger lock, especially when you need to make quick adjustments or pause briefly between cuts.

The grinder is equipped with anti-rotation safety features, specifically a Kickback Brake and an E-Clutch. These systems are designed to react if the wheel binds or stalls. The Kickback Brake stops the motor instantly to prevent the tool from twisting in your hands. The E-Clutch disengages the gear train to protect the internal components from sudden shock loads. These features enhance control during tough jobs, such as cutting 1/2-inch rebar.

With a no-load speed of 9,000 RPM and a brushless motor, the tool delivers consistent power. The motor is engineered to handle up to 850 MWO, ensuring efficient energy use. You can expect up to 56 cuts of 1/2-inch rebar on a single charge, depending on the application. The lightweight 3.55-pound bare tool helps reduce fatigue during extended periods of overhead or precise work.

Before You Buy This Grinder

Before you buy, consider the accessories you already own. This grinder uses standard 4-1/2 inch discs, so you likely have compatible cutting or grinding wheels in your shop. Check your existing battery inventory. If you already use DEWALT 20V MAX tools, this kit integrates seamlessly with your current system. You do not need to purchase a separate power source. The included battery and charger handle initial setup. However, for heavy daily use, you may want extra batteries to keep working while one charges. The slide-switch design is practical for quick starts, but ensure you are comfortable with this control style. It differs from trigger switches found on other models. This tool fits well alongside other cordless grinders in the market. It offers strong performance with its brushless motor. Yet, you must verify that its weight and balance suit your specific tasks. It is best for users who need portable power without cord constraints.

Check before you buy

• Verify you have 4-1/2 inch compatible discs.
• Check if you own DEWALT 20V MAX batteries.
• Confirm comfort with slide-switch operation.
• Ensure workspace has charging access.

The product at a glance

1

DEWALT 20V MAX 4-1/2-Inch Cordless Grinder Kit

Best for: General cutting and grinding tasks

Power Source

20V MAX cordless

Wheel Diameter

4-1/2 in.

Motor Type

Brushless

No-Load Speed

9,000 RPM

Switch Type

Slide

Battery Included

Yes (kit)

View on Amazon: DEWALT 20V MAX 4-1/2-Inch Cordless Grinder Kit Affiliate link

This DEWALT 20V MAX cordless angle grinder features a brushless motor delivering up to 9,000 RPM. It includes a 4-1/2 inch wheel and slide-switch control for precise operation. The kit comes with a battery and charger. Weighing 3.55 pounds bare, it helps reduce fatigue. Safety features like a kickback brake and E-Clutch protect you during tough jobs. It suits users needing reliable power for cutting and grinding tasks.

Pros

• Brushless motor delivers up to 9,000 RPM no-load speed
• Includes 20V MAX battery and charger in the kit
• Anti-rotation features with Kickback Brake and E-Clutch
• Lightweight 3.55 lb bare tool design reduces fatigue

Cons

• Limited to 4-1/2 inch wheel diameter
• Slide switch may require constant pressure during use
• No-Load speed of 9,000 RPM is moderate for heavy grinding

Good fit if

• You need a lightweight tool for extended overhead work
• You want a complete kit with battery and charger included
• You prioritize safety features like kickback braking

Skip if

• You require variable speed control for delicate materials
• You need a larger 5-inch or larger wheel capacity
• You prefer a paddle switch for two-handed operation

Verdict: DEWALT 20V MAX 4.5 In Angle Grinder fits users who need a safe, lightweight cordless grinder for general cutting and grinding. It is ideal for those who value included battery and charger convenience.

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Frequently asked questions

See also

• dewalt 20v max cordless 4 alternatives
• best DEWALT angle grinders under 200
• dewalt 20v max 4 tool cordless review
• dewalt 20v max cordless orbital review