Worx WX812L.9 20V Cordless Angle Grinder: features, specs and who it suits

The Worx WX812L.9 is a 4.5-inch cordless angle grinder from the brand's Nitro line, built on the 20V Power Share battery platform. Angle grinders handle cutting, grinding and polishing, and the cordless format means no cable to drag around. This model is sold as a bare tool, so the battery and charger are separate.

What the brushless motor changes

Traditional motors use carbon brushes that rub against the spinning part, which creates friction and wear. A brushless motor uses electronics instead, which generally means less wasted energy, less heat and fewer parts to wear out. Worx says its brushless motors run 50% longer, are 25% more powerful and have a 10% longer life than brushed designs. Those are the brand's comparisons, and real-world results depend on the battery and the job.

What 8,500 RPM means

The listing gives a no-load speed of 8,500 RPM, meaning the disc speed when it isn't touching anything. Under load the speed drops. Worx says the speed suits grinding metal, cutting tile, paving and routing out mortar, as well as lighter sanding and polishing. The right accessory disc for each job matters, and each disc has its own maximum speed, which must be at or above the tool's speed.

Anti-kickback

Kickback happens when a disc binds in the material and the tool jerks. Worx says sensors detect a jam and shut the grinder down. This is an additional feature, not a replacement for safe technique: use the guard, hold the tool with both hands, and wear eye protection as the manual advises.

Handling

The grinder has a slim body, which Worx says helps it fit into tighter spaces and makes it easier to carry and put away. A two-position auxiliary handle lets you change grip angle for the job, and the main handle is described as ergonomic for control. The listing gives a weight of 3.7 lb (about 1.7 kg) for the bare tool, in a package measuring roughly 5 x 5 x 13 inches (13 x 13 x 33 cm), though the brand's description mentions 4.5 lb.

One battery, many tools

The grinder uses the 20V Power Share battery system. Worx says one battery fits more than 75 20V, 40V and 80V tools in its range, covering workshop, garden and household products. If you already own Power Share batteries, you can use them here.

What's in the box

• The Nitro angle grinder (WX812L.9)
• A metal grinding disc
• Auxiliary handle
• Spanner
• Carry bag

The 20V Power Share battery and charger are sold separately.

Who it suits

It suits home workshop users and tradespeople who already own Power Share batteries and want a compact grinder for metal, tile and mortar. Anyone starting from nothing will need to plan for a battery and charger too.

What to check before you buy

• Battery and charger: confirm you have a compatible 20V Power Share battery and a charger.
• Discs: the tool takes 4.5-inch discs. Choose the type for each material and check its maximum speed.
• Jobs: consider whether a cordless tool will run long enough for sustained cutting.
• Safety gear: eye protection, gloves and hearing protection are standard for grinding.
• Spares: keep spare discs and check the manual for disc changes using the spanner.

The short version

• A 4.5-inch 20V cordless angle grinder with a brushless motor and 8,500 RPM no-load speed.
• Anti-kickback shut-off, slim body and a two-position auxiliary handle.
• Bare tool: battery and charger are sold separately.
• Works with the Power Share battery family.
• Includes a metal grinding disc, spanner, handle and carry bag.

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