DEWALT 20V MAX* XR Brushless Cordless 4-1/2 in. - vs DEWALT Angle Grinder, 7-Inch, 13-Amp, 8,000 RPM

Power and Performance

The DEWALT 20V MAX* XR Brushless Cordless offers more power with up to 1,640 MWO and 9,000 RPM, compared to the DEWALT Angle Grinder’s 13 Amp motor delivering 2,250 UWO and 8,000 RPM. This means the cordless model has a higher no-load speed, reaching 9,000 RPM, which can translate to faster cutting and grinding performance on tough jobs. Meanwhile, the corded DEWALT Angle Grinder provides a solid 8,000 RPM speed with a 13 Amp motor, sufficient for most medium-duty metal grinding and cutting tasks. The brushless motor in the cordless grinder optimizes power efficiency and tool life, giving it an edge in sustained performance. Overall, the cordless grinder is designed for more demanding applications with its higher RPM and brushless technology, while the corded model offers reliable power suitable for everyday medium tasks.

Mobility and Convenience

The DEWALT 20V MAX* XR is a cordless tool, running on a 20V Max battery system (battery and charger sold separately), which gives it the advantage of portability and freedom from power cords. This makes it ideal for jobsites where mobility is critical. On the other hand, the DEWALT Angle Grinder is corded, requiring an AC power source, which limits mobility but ensures continuous power without the need for recharging. While the cordless grinder’s price of $221.71 includes only the tool, users must invest additionally in batteries and chargers, whereas the corded grinder is ready to use out of the box at $166.02. For users prioritizing mobility and cordless convenience, the 20V MAX* XR is the better choice, while those who prefer uninterrupted power and a lower upfront cost may lean toward the corded DW840.

Speed Control and Safety Features

The DEWALT 20V MAX* XR Grinder provides variable speed functionality, allowing users to adjust wheel speed to optimize performance across different materials. This control is valuable for precision work and enhances versatility. It also includes an anti-rotation system that senses excessive rotational motion and automatically shuts down the tool to prevent injury or damage. Conversely, the DEWALT Angle Grinder operates at a fixed speed of 8,000 RPM and lacks variable speed control and advanced shutdown safety features. However, it does feature an adjustable guard designed to redirect sparks away from the user and a spindle lock button for easy wheel changes. The cordless model’s advanced safety and speed control features make it better suited for users needing more precision and protection during heavy or varied applications.

Ergonomics and User Control

Both grinders emphasize user control but approach it differently. The DEWALT 20V MAX* XR is equipped with a paddle switch for easy on/off control and includes a wireless tool control system that can be paired with a compatible DEWALT dust extractor (sold separately) for enhanced dust management. This feature optimizes user comfort and workspace cleanliness. The DW840 corded grinder has a rear-handle grip for better control and comfort, a two-position side handle for optimal handling, and a single-wrench wheel change with a spindle lock button, simplifying maintenance. While the cordless grinder offers futuristic features like wireless control, the corded grinder’s ergonomic design and straightforward controls remain effective for long sessions. The choice depends on whether wireless integration or classic design is preferred.

Durability and Maintenance

The DEWALT Angle Grinder (DW840) highlights durability with sealed ball and roller bearings that prevent debris from entering the motor, and external brush doors that allow easy access for servicing. These features contribute to longer tool life and simpler maintenance. The cordless DEWALT 20V MAX* XR does not list these specific durability features but benefits from a brushless motor, which typically reduces wear and tear compared to brushed motors. However, the cordless model’s maintenance needs may include battery upkeep and management of the TOOL CONNECT chip (sold separately). The corded model’s proven mechanical durability and serviceability make it appealing for users who prioritize straightforward upkeep, while the cordless grinder benefits from brushless technology’s inherent longevity.

Price and Value

The DEWALT 20V MAX* XR Brushless Cordless Grinder is priced at $221.71 (tool only), whereas the DEWALT Angle Grinder (DW840) is about 25% cheaper at $166.02. While the cordless grinder offers more features and mobility, buyers must also consider the additional cost of purchasing batteries and chargers, which are not included. The corded grinder’s lower price and included readiness make it a more budget-conscious option. Additionally, the cordless grinder’s bestseller rank is 19,912, significantly better than the corded grinder’s rank of 60,043, indicating stronger market demand or popularity. Ultimately, the cordless model commands a premium price for its advanced technology and portability, while the corded grinder offers strong value for straightforward, reliable use.

Application Suitability

The DEWALT 20V MAX* XR is best suited for professionals who need a versatile, portable tool capable of handling a variety of materials with adjustable speed and advanced safety features. Its brushless motor and variable speed control make it ideal for jobs requiring precision and power without being tethered to an outlet. In contrast, the DEWALT Angle Grinder’s 7-inch wheel, 13 Amp motor, and dust ejection system make it a solid choice for medium-duty metal grinding and cutting projects where continuous power and durability are priorities. The corded grinder’s adjustable guard and quick wheel change features support efficiency on repetitive tasks. Users should consider the nature of their work—whether mobility or sustained power is more critical—when choosing between these grinders.

Which should you buy?

Your choice depends on your priorities: the DEWALT 20V MAX* XR Brushless Cordless Grinder offers superior power with 9,000 RPM, variable speed control, and wireless tool integration but comes at a higher price of $221.71 plus the cost of batteries and chargers. It is ideal for professionals needing portability, precision, and advanced safety. Meanwhile, the DEWALT Angle Grinder (DW840) is about 25% less expensive at $166.02, runs corded for uninterrupted power, and features robust durability with sealed bearings and dust ejection, making it more suitable for medium-duty, stationary grinding tasks. If you value cordless convenience and cutting-edge technology, go with the 20V MAX* XR. If you want reliable, cost-effective power for consistent use, the DW840 is the better pick.