HOW TO READ A GRINDING WHEEL Grain Types

A- Dark Aluminum Oxide – Most common grain. Used for Heavy Duty General Purpose

AS3- 20% Ceramic Aluminum Oxide, 30% Pink Grain, 50% White Grain. Excellent for form and corner holding.

AZ- Blue Aluminum Oxide- Grinds fast with excellent cool cutting action and requires minimal dressing.

RA- Red Aluminum Oxide (Ruby)- Harder grain and sharper than PA & AZ wheels good for steels with high level chromium

PA- Pink Aluminum Oxide- General Purpose Grain that is tough but friable. Tool Room sharpening applications.

WA- White Aluminum Oxide- Highly friable grain for fast cool cutting. Good for light grinding on all steels particularly on tool and die steels.

GC- Green Silicon Carbide- very friable use for carbide grinding applications.

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