DEWALT Angle Grinder, 4. vs DEWALT Angle Grinder, 7-Inch, 13-Amp, 8,000 RPM
Updated July 2026 — DEWALT Angle Grinder, 7-Inch, 13-Amp, 8,000 RPM leads on weight and length.
The DEWALT Angle Grinder, 4.5 Inch, is a more compact and budget-friendly option, while the 7-Inch model offers greater power for heavy-duty tasks.
Why DEWALT Angle Grinder, 4. is better
Price
DWE402 is $94.00, cheaper than DW840.
Weight
DWE402 is more lightweight and portable.
Speed
DWE402 has a higher RPM of 11,000.
Why DEWALT Angle Grinder, 7-Inch, 13-Amp, 8,000 RPM is better
Power
DW840 has a 13 Amp motor for heavier tasks.
Torque
DW840 provides more torque for larger materials.
Durability
DW840 features sealed bearings for better protection.
Overall score
Specifications
| Spec | DEWALT Angle Grinder, 4. | DEWALT Angle Grinder, 7-Inch, 13-Amp, 8,000 RPM |
|---|---|---|
| Motor Power | 11 Amp | 13 Amp |
| Max RPM | 11,000 | 8,000 |
| Dust Ejection | Yes | Yes |
| Wheel Size | 4.5 Inch | 7 Inch |
| Warranty | 3 Years | 3 Years |
Dimension comparison
Overview of the DEWALT Angle Grinders
When comparing the DEWALT Angle Grinder, 4.5 Inch, 11 Amp, and the DEWALT Angle Grinder, 7-Inch, 13-Amp, it is clear that both tools are designed for different types of jobs. The 4.5-inch model (DWE402) is more compact and lightweight, while the 7-inch model (DW840) offers greater power and larger grinding capabilities. The choice between these two grinders ultimately depends on the specific tasks you intend to tackle.
The DWE402 features an 11 Amp motor that delivers a high speed of 11,000 RPM, making it ideal for smaller, precision work. In contrast, the DW840 is equipped with a 13 Amp motor that runs at a lower 8,000 RPM but provides more torque for heavier applications. The fundamental differences in size and power cater to varying user needs, whether for light-duty tasks or more demanding grinding jobs.
Power and Performance
Power and performance are critical aspects to consider when choosing an angle grinder. The 4.5-inch DEWALT Angle Grinder has an impressive 11 Amp motor that allows it to reach a maximum speed of 11,000 RPM. This high RPM makes it particularly effective for quick and efficient grinding tasks.
On the other hand, the 7-inch DEWALT Angle Grinder features a slightly more powerful 13 Amp motor, but it operates at a lower maximum speed of 8,000 RPM. This design provides more torque, making it better suited for heavy-duty work, such as cutting and grinding larger materials. The choice of motor strength and speed ultimately affects the type of projects each grinder can handle efficiently.
Design and Ergonomics
The design and ergonomics of an angle grinder greatly influence user comfort and control. The DWE402 is designed with a compact and ergonomic grip, allowing for easy maneuverability during use. Its uniquely small gripping surface enhances comfort, making it suitable for prolonged periods of use without causing fatigue.
Conversely, the DW840 features a rear-handle grip that improves control and comfort, especially during heavy-duty tasks. The adjustable keyless guard can be easily repositioned to redirect sparks away from the user. While both grinders prioritize user-friendly designs, the choice will depend on the specific comfort needs for the type of work being tackled.
Features and Functionality
Both models come equipped with unique features that enhance their functionality. The DWE402 boasts a Dust Ejection System, which prevents damaging dust and debris from entering the tool, thereby increasing its lifespan and performance. It also includes a Quick-Change Wheel Release for effortless wheel changes and a One-Touch Guard that offers 360-degree rotation.
In contrast, the DW840 includes adjustable guards that can redirect sparks, a single-wrench wheel change system for convenience, and sealed bearings to protect against debris. Each grinder has its own set of features tailored to different working conditions, making them suitable for specific tasks.
Price Comparison
Price is a significant factor when choosing between these two grinders. The DWE402 is priced at $94.00, making it about 43% cheaper than the DW840, which retails for $166.02. This price difference may influence buyers who are budget-conscious or who require a tool for lighter tasks.
While the higher price of the DW840 reflects its additional power and features, the DWE402 offers a more affordable option for those who do not need the larger size and increased capabilities. Ultimately, the decision may hinge on whether the additional investment in the DW840 aligns with the user’s specific needs.
Sales Rank and Popularity
Sales rank can provide insight into the popularity and reliability of a product. The DWE402 has a sales rank of 3,735, indicating that it is a well-regarded choice among users. Its combination of power, features, and price has made it a bestseller in its category.
In contrast, the DW840 has a sales rank of 60,043, suggesting that while it may not be as popular as the smaller model, it still serves a niche market of users who require more robust grinding capabilities. The differences in sales rank can reflect user satisfaction and the effectiveness of each tool in its intended applications.
Which should you buy?
Deciding between the DEWALT Angle Grinder, 4.5 Inch, and the DEWALT Angle Grinder, 7-Inch, ultimately depends on your specific needs. If you are looking for a lightweight, compact, and budget-friendly option for smaller tasks, the DWE402 is the clear choice at $94.00. However, if your projects require more power and larger grinding capabilities, investing in the DW840 at $166.02 may be worth it for the additional features and increased torque. Consider the nature of your work and select the grinder that best aligns with your requirements.

