WORX 20V Brushless 4.5-Inch Cordless Review: Specs, Pros and Cons

What stands out

• Brushless motor for extended runtime and efficiency
• 8,500 RPM no-load speed for quick material removal
• Anti-kickback technology to shut down the tool during jams
• Slim 4.2-pound design for better maneuverability
• Compatible with all Worx 20V and 40V Power Share batteries

Who it fits

Key specs explained for this grinder

Motor Type: Brushless

This motor lacks physical carbon brushes, which reduces friction and wear. You get longer runtime per charge and more consistent power output. The design also extends the tool's overall lifespan compared to brushed alternatives. If you plan to use the grinder frequently for tough jobs, this efficiency matters. It means less maintenance and fewer replacements over time.

No-Load Speed: 8,500 RPM

This is the speed the disc spins when not cutting or grinding. Higher RPMs generally mean faster material removal for cutting tasks. This speed is standard for 4.5-inch grinders. You should compare this against other models to ensure it matches your workflow speed. It helps you finish cuts and surface prep work efficiently without unnecessary waiting.

Wheel Diameter: 4-1/2 in.

This is the maximum disc size the tool accepts. It is the industry standard for compact angle grinders. This size offers a good balance between cutting depth and maneuverability. You can find many compatible discs at local hardware stores. It is ideal for general fabrication, cutting metal, or grinding welds in tight spaces where larger grinders cannot fit.

Power Source: Cordless (20V)

The tool runs on a rechargeable 20V battery instead of a power cord. This gives you freedom to move around worksites without tripping over cables. You can use it outdoors or in areas without outlets. Check if your existing WORX 20V batteries are compatible to save money. This setup is best for users who prioritize mobility and portability over constant high-power demand.

Design and build details

According to the listing, the WORX WX812L weighs 4.2 pounds and measures 14 inches in height, 5.25 inches in length, and 5 inches in width. The compact footprint allows you to access tight spaces more easily than bulkier grinders. The slim profile also simplifies transport and storage in a crowded toolbox. You can maneuver the tool with less fatigue during overhead or confined work.

The handle features an ergonomic design intended to provide a secure grip. This layout helps maintain control during extended use, reducing hand strain. An auxiliary handle offers two mounting positions, giving you leverage and flexibility to find a comfortable hold. The color scheme is black and orange, which helps keep the tool visible in busy work areas.

Safety is built into the design through electronic anti-kickback technology. This system shuts down the tool when a jam is detected, protecting your hands from sudden torque reactions. The brushless motor contributes to a more efficient internal layout by eliminating physical brushes. This reduces friction and wear, allowing for longer runtime and a potentially extended lifespan. The overall build prioritizes user control and safety without adding unnecessary bulk.

Setup and everyday use guide

Setting up this WORX WX812L angle grinder is straightforward. The box includes a 2.0 Ah 20V battery and a five-hour charger. You charge the battery before your first cut. The tool also comes with an auxiliary handle, a metal grinding disc, and a spanner wrench. Attaching the auxiliary handle is simple. It offers two positions, allowing you to find a grip that provides better leverage. You can adjust the handle to suit your hand size or the angle of your work. Changing discs requires the included spanner wrench. The spindle measures 5/8 inch by 11 UNC, which is a standard size for many accessories. You can swap the metal grinding disc for cutting wheels or other compatible abrasives.

In daily use, the 8,500 RPM no-load speed provides consistent power for grinding and cutting tasks. The brushless motor delivers efficient performance without the friction of carbon brushes. This design helps extend the tool's runtime and overall lifespan. The anti-kickback feature adds a layer of safety by shutting down the tool if it jams. This electronic response helps prevent sudden jerks during operation. The ergonomic handle ensures a secure grip, reducing fatigue during long sessions. You can use this grinder with any WORX 20V or 40V battery from the Power Share line. This compatibility means you can share batteries with other tools in your workshop, simplifying your power source management. The slim 4.2-pound design makes it easy to maneuver in tight spaces.

Before you buy this grinder

This WORX WX812L is a single tool, not a full combo kit. You will need to buy separate discs for cutting or grinding different materials. The listing includes a metal grinding disc, but abrasive wheels for masonry or concrete are not listed. You must verify your existing WORX 20V Power Share batteries are compatible. This system works with all 20V and 40V WORX tools, so if you already own other devices, you can save on extra batteries. Keep the spindle wrench handy for quick wheel changes. Store the auxiliary handle securely to prevent loss. This grinder fits well if you already have a WORX ecosystem. It does not replace a drill or saw. Check your workspace for adequate ventilation when grinding metal. Ensure you have safety glasses and gloves ready. This tool suits users who need precise angle grinding capabilities without cord restrictions.

Check before you buy

• Verify your existing WORX 20V batteries fit this tool.
• Buy separate cutting discs if you need to cut concrete.
• Ensure you have proper safety gear for grinding tasks.
• Check if you need additional batteries for longer runtime.
• Confirm you have a safe, ventilated workspace for metal work.

The product at a glance

1

WORX 20V Brushless 4.5-Inch Cordless Angle Grinder

Best for: Light duty cutting and grinding tasks

Power Source

Cordless, 20V

Wheel Diameter

4.5 in.

Motor Type

Brushless

No-Load Speed

8500 RPM

Battery Included

Yes (kit)

Safety Features

Anti-kickback protection

View on Amazon: WORX 20V Brushless 4.5-Inch Cordless Angle Grinder Affiliate link

This WORX WX812L is a 20V cordless angle grinder with a brushless motor. It runs at 8,500 RPM and accepts 4-1/2 inch discs. The tool weighs 4.2 pounds and features anti-kickback protection. It includes a 2.0 Ah battery and charger. The slim design helps you reach tight spaces. It suits users who need a lightweight, efficient grinder for general metal or stone work.

Pros

• Brushless motor for longer runtime and efficiency
• Anti-kickback technology shuts down during jams
• Lightweight 4.2-pound design for easy handling
• Compatible with all WORX 20V batteries

Cons

• Includes only a 2.0 Ah battery
• No variable speed control listed
• Single speed operation at 8,500 RPM

Good fit if

• You need a lightweight tool for overhead work
• You already own WORX 20V batteries
• You want safety features for occasional use

Skip if

• You require high torque for heavy cutting
• You need variable speed settings
• You prefer a heavier, more stable tool

Verdict: WORX 20V Brushless 4.5-Inch Grinder is a practical choice for DIYers who value portability and safety over raw power. It fits users who already have the battery platform and need a manageable tool for light to medium tasks.

Specifications side by side

Frequently asked questions

See also

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