Makita D-42640 Diamond Wheel 110mm, Corrugated Long Life, Dry Cutting for Concrete

Makita D-42640 diamond wheel, 110mm, corrugated rim, long life grade, for dry cutting concrete. Fits 100mm angle grinders and 110mm cutters.

Specifications

• Diameter: 110mm
• Thickness (T): 2.2mm
• Segment height (X): 7mm
• Rim height (H): 20mm
• Bore (d): 16mm
• Shape: corrugated
• Colour: gold
• Grade: long life (★★★)
• Suits: 100mm grinder, 110mm cutter

What corrugated means

The rim is continuous but waved rather than flat. A fully continuous rim gives the cleanest edge but traps heat; a segmented rim runs cool but chips the surface. The corrugated profile sits between the two — the waves let air through to cool the blade and clear dust, while keeping the rim unbroken enough to leave a tidier edge than a segmented wheel would.

That makes it a sensible general choice for concrete where the cut will be seen, rather than pure speed work.

Dry cutting safely

• Let it cool. Dry cutting relies on air, so cut in passes and let the wheel spin free for a few seconds between them rather than holding it in the cut.
• Check the bore. 16mm — it must seat properly on the spindle.
• Check the maximum speed on the wheel against your grinder before fitting.
• Cut straight. Twisting a thin diamond wheel in the kerf is what cracks the steel core.
• Concrete dust is a serious respiratory hazard. Mask up, and use extraction or water suppression where you can.

Specification and material suitability charts are below.

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