![]() ![]() The grade signifies not the hardness of the abrasive grains themselves but the hardness of the bond holding them in place. Manufacturers often refer to the grade, or hardness, of a wheel. The bond of a cutting wheel is the substance that holds the abrasive grains in place. Grit sizes range from 16 to 60, with smaller numbers indicating larger, coarser particles and larger numbers indicating smaller, finer particles. The grit refers to the size of the individual abrasive particles, in the same way sandpaper grains receive classification by their size. The grain's grit helps determine its physical and performance properties as well.
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