20V or 18V Angle Grinders? Compared by Specs

Key differences

Which one should you choose?

20V vs 18V Angle Grinder Specs

Voltage platform

Edge: Tie

The DEWALT DCG413B operates on a 20V MAX power source, while the Makita XAG04Z-R uses an 18V LXT system. Voltage differences often dictate which battery ecosystem you already own. If you are invested in the 20V MAX lineup, the DEWALT tool integrates seamlessly with your existing cells. Conversely, if your workshop is stocked with 18V LXT batteries, the Makita fits that setup. Neither voltage is inherently superior without context; the choice depends on your current inventory. Both platforms deliver sufficient power for standard angle grinding tasks, so your decision should rest on battery compatibility rather than raw voltage numbers alone.

Motor technology

Edge: Tie

Both the DEWALT and Makita grinders feature brushless motors. This shared specification means both tools eliminate carbon brushes, which reduces maintenance needs and extends motor life. Brushless designs run cooler and more efficiently than brushed counterparts, allowing for longer run times per charge. The Makita explicitly notes that its electronic control optimizes battery energy use for up to 50% longer run time. The DEWALT also highlights that its brushless motor requires no brush changes. Since both utilize this advanced motor type, you gain efficiency and durability in either case. This aspect is a clear tie for buyers prioritizing long-term reliability and low upkeep.

Wheel compatibility

Edge: Makita 18V Brushless 4-1/2 to 5-Inch Grinder

The DEWALT DCG413B is designed specifically for 4-1/2 inch wheels. The Makita XAG04Z-R offers greater versatility by supporting both 4-1/2 inch and 5-inch discs. This dual compatibility allows you to use larger cutting wheels for heavier tasks without switching tools. If you frequently work with 5-inch discs, the Makita provides a distinct advantage. However, if you strictly use 4-1/2 inch abrasives, both tools perform identically. The Makita’s ability to handle a wider range of disc sizes makes it more flexible for diverse jobs. For users needing occasional larger cuts, the Makita wins this round.

Safety features

Edge: DEWALT 20V MAX 4-1/2-Inch Brushless Paddle Grinder

The DEWALT includes a Kickback Brake that engages during pinch or stall events, stopping the wheel quickly to reduce movement. It also features E-Switch Protection to prevent unexpected restarts after power outages. The Makita utilizes Active Feedback-sensing Technology (AFT) to turn the motor off if rotation is suddenly forced to a stop. Both tools prioritize operator safety through electronic intervention. The DEWALT adds a no-volt release function for extra caution. While both offer robust protection, the DEWALT’s explicit mention of kickback braking and no-volt release provides a slightly more comprehensive safety suite for high-torque applications.

Switch type

Edge: DEWALT 20V MAX 4-1/2-Inch Brushless Paddle Grinder

The DEWALT DCG413B uses a paddle switch, which allows for quick activation and deactivation with the palm of your hand. This design is often preferred for precise control and reduced hand fatigue during extended use. The Makita XAG04Z-R does not specify its switch type in the provided data. Without this information, we cannot directly compare the ergonomics of the controls. However, the paddle switch on the DEWALT is a known industry standard for angle grinders, offering immediate access. If you prefer tactile paddle controls over trigger switches, the DEWALT is the clear choice. This advantage goes to the DEWALT based on known specifications.

Which angle grinder fits your workflow best

Users needing fast wheel stop for safety

Our pick: DEWALT 20V MAX 4-1/2-Inch Brushless Paddle Grinder

The DEWALT DCG413B includes a Kickback Brake that engages when a bind-up is sensed. It stops the wheel in two seconds or less. This rapid deceleration reduces movement and shuts the tool off quickly. If you prioritize immediate safety response during cutting or grinding, this electronic brake feature offers a clear advantage over the Makita.

Professionals valuing versatile wheel compatibility

Our pick: Makita 18V Brushless 4-1/2 to 5-Inch Grinder

The Makita XAG04Z-R supports both 4-1/2 inch and 5-inch wheels. This flexibility allows you to switch between smaller cutting discs and larger grinding wheels without changing tools. The spindle thread is 5/8 inch - 11 UNC. If your projects require varying disc sizes, this dual compatibility makes it the more adaptable choice for your toolkit.

Those preferring paddle switch control

Our pick: DEWALT 20V MAX 4-1/2-Inch Brushless Paddle Grinder

The DEWALT DCG413B uses a paddle switch that requires two actions to activate. This two-stage trigger adds a layer of safety against accidental starts. The paddle design also allows for quick release by simply letting go of the switch. If you prefer tactile, immediate control with a safety-focused trigger mechanism, this switch type suits your handling preference.

Users seeking adaptive speed and torque

Our pick: Makita 18V Brushless 4-1/2 to 5-Inch Grinder

The Makita XAG04Z-R features automatic speed change technology. It adjusts speed and torque during operation for optimum performance. The brushless motor electronically controls energy use to match torque and RPM to changing demands. If you want a tool that actively optimizes its output based on the resistance it encounters, this adaptive technology provides a distinct operational benefit.

Quick picks

The products compared

1

DEWALT 20V MAX 4-1/2-Inch Brushless Paddle Grinder

Best for: Existing DEWALT 20V users needing a safe, brushless grinder

Voltage

20V (what this guide is about)

Power Source

20V MAX cordless

Wheel Diameter

4-1/2 in.

Motor Type

Brushless

Switch Type

Paddle

Battery Included

No (tool only)

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

This DEWALT 20V MAX cordless angle grinder features a brushless motor and a 4-1/2 inch wheel. It uses a paddle switch with a two-stage trigger for safety. The kickback brake stops the wheel in two seconds or less. The tool weighs 3.75 pounds and measures 12.2 inches long. It is sold as a bare tool without a battery. This setup suits users who already own compatible 20V batteries.

Pros

• Brushless motor requires no brush changes
• Kickback brake engages with maximum force
• Stops wheel in 2 seconds or less
• E-Switch Protection prevents restart after power outage

Cons

• Sold as a bare tool without a battery
• Paddle switch may feel bulky for tight spaces
• Two-stage trigger requires two actions to activate

Good fit if

• You already have DEWALT 20V MAX batteries
• You want a brushless motor for longer life
• You prefer a paddle switch for safety

Skip if

• You need a tool with a battery included
• You prefer a trigger switch over a paddle
• You need a larger 5-inch wheel capacity

Verdict: DEWALT 20V MAX Brushless Angle Grinder is a solid choice for users who already own 20V batteries and need a safe, brushless grinder with a paddle switch. It fits pros who value kickback protection and tool-only flexibility.

2

Makita 18V Brushless 4-1/2 to 5-Inch Grinder

Best for: Makita battery owners needing safety features

Voltage

18V (what this guide is about)

Power Source

18 V cordless

Wheel Diameter

4-1/2 in. / 5 in.

Motor Type

Brushless

Battery Included

No (tool only)

Safety Features

AFT, Automatic Speed Change

View on Amazon: Makita 18V Brushless 4-1/2 to 5-Inch Grinder Affiliate link

This 18V cordless angle grinder features a brushless motor for efficient energy use and longer run times. It supports 4-1/2 inch and 5 inch wheels with a 5/8-11 UNC spindle. Safety includes active feedback sensing and automatic speed change technology. It is sold as a bare tool, requiring a separate battery. This setup suits users who already own Makita 18V batteries and need reliable cutting or grinding performance.

Pros

• Brushless motor optimizes battery energy use
• Active feedback-sensing technology (AFT) stops motor if wheel binds
• Automatic speed change adjusts torque and RPM
• Accepts 4-1/2 inch and 5 inch wheels

Cons

• 18V system offers less power than 20V competitors
• Bare tool design requires separate battery purchase
• Heavier build compared to smaller 18V models

Good fit if

• You already own Makita 18V batteries
• You need safety features like AFT
• You prefer brushless motor efficiency

Skip if

• You want a complete kit with battery and charger
• You need maximum power for heavy duty tasks
• You prefer 20V MAX platform compatibility

Verdict: Makita 18V Brushless Angle Grinder is a solid choice for Makita ecosystem users who value safety and efficiency over raw power. It fits those who already have compatible batteries and need reliable performance for standard cutting and grinding tasks.

Specifications side by side

Frequently asked questions

See also

• best 18V angle grinders
• 20V vs 18V chainsaw