Anatomy of a Grinding Wheel – Mach-B Grinding Wheel ...
2014-6-11 · Normal grits are 30, 36, 46, 54, 60 and 70. Fine grits are 80, 90, 100, 120, 150, 180 and 220. Very Fine grits are 240, 280 and up. Grade refers to the strength of the bond (we’ll get to bond in a bit) that holds the abrasive grains