2016-07-27

What Do Grit Size Numbers Stand for?

Every ultrathin cutting wheel has a number designating this characteristic. Grit size is the size of individual abrasive grains in the wheel. It corresponds to the number of openings per linear inch in the final screen size used to size the grain. That is to say, higher numbers denote smaller openings in the screen the grains pass through.

 

Lower numbers -10, 16 or 24

These mean cutting and grinding wheels with coarse grains. The coarser the grain, the larger the size of the material removed. Coarse grains are used for rapid stock removal where finish is not important.

Higher numbers -70, 100 and 180

They are fine grit wheels, which are appropriate for imparting fine finishes, for small areas of contact, and also for use with hard, brittle materials.