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The DEWALT DWA4240 is a diamond-grit half-moon oscillating blade designed for long-lasting grout removal and multi-purpose cutting in most oscillating tools.
Categories : tools
SKU : WOR-TOO-900
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The DEWALT DWA4240 Diamond Half Moon Oscillating Blade is a versatile, multi-purpose blade built to handle the toughest grinding and material-removal tasks in your shop. Its synthetic diamond coating delivers exceptional longevity in abrasive applications, making it a dependable choice for grout removal and more.
The half-moon shape lets you access tight joints and corners that full-circle blades can't reach, while the diamond grit cuts through hardened mortar quickly and cleanly. This blade is a go-to for remodeling, tile prep, and masonry touch-ups.
The synthetic diamond coating is bonded to a steel base for extra durability. You'll spend less time swapping blades and more time on the job, even in high-wear applications.
With a universal fitment, this blade works with most oscillating multi-tools, including DEWALT, Dremel, Fein, Porter-Cable, and other major brands. Check your tool's blade attachment structure to confirm compatibility.
While the DWA4240 is optimized for grout, it's also useful for light tile scraping, thin-set removal, and cleaning mortar residue. For heavy concrete cutting, consider a dedicated diamond blade. The half-moon format is ideal for surfaces that need a wider reach without overcutting.
Whether you're a weekend renovator or a contractor, the DEWALT DWA4240 delivers dependable performance and real staying power.
Diamond grit coating for extended cutting life
Universal fitment for most oscillating multi-tools
Half-moon shape reaches tight corners and joints
Multi-purpose design for grinding and scrap removal
Model: DWA4240
Weight: 0.2 lb (90 g)
Material: Steel with synthetic diamond grit
Product Type: Oscillating Blade
Compatibility: Universal fit for most oscillating tools
Blade Diameter: 3.5 in (8.9 cm)
Blade Thickness: 0.04 in (1 mm)
Package Dimensions: 0.82 x 6.76 x 4.82 in (2.1 x 17.2 x 12.2 cm)
Seller: Workbench World
MPN: DWA4240
Diamond is the hardest abrasive available. On an oscillating blade, it cuts through grout, thin-set, and masonry without losing edge sharpness. The DWA4240 uses a synthetic diamond coating that bonds evenly to the steel, giving you consistent performance from start to finish.
The universal fitment means you can use this blade on almost any oscillating tool: DEWALT, Dremel, Fein, Makita, and more. It saves you from buying a separate blade list for each brand—one blade does the job.
The half-moon profile is specifically shaped to remove grout lines that run between tiles. It covers a wide path yet reaches flush into corners, letting you finish joints quickly and cleanly.
For best results, work at a 30–45° angle and keep the blade flat against the joint. Clear dust often and let the diamond grit handle the grinding. You'll finish more linear feet per hour than with manual tools.
Always wear eye protection and a dust mask when cutting. Keep the blade clean and store it in a dry spot. With normal use, this blade will become a staple in your toolbox.
Yes, the DWA4240 has universal fitment for most oscillating tools. Check your tool's attachment to ensure a secure lock.
It is primarily designed for grout removal and light scraping. For heavy tile cutting, use a dedicated diamond blade.
It depends on material and speed, but the diamond grit coating is designed for long life in abrasive applications, outlasting standard blades.
Use a moderate oscillation speed (typically 10,000–18,000 OPM) and apply light pressure for best results.
Works on grout.
This blade cuts grout easily. It's holding up well.
