Grinding Discs

Match the disc type and grit to the material: use diamond or CBN-bonded discs for hard masonry, tile, and stone; silicon carbide or aluminum oxide for metal, cast iron, and non-ferrous materials; and coarse grits (40–80) for heavy stock removal, medium grits (80–120) for shaping, and fine grits (120+) for finishing

Check your grinder’s specifications for maximum disc diameter and arbor (center hole) size; common consumer sizes are 4.5" and 7" diameters with arbor holes typically 7/8" (22.23 mm) or secured with a standard flange adapter—never use a disc larger than the tool’s rated size

Choose discs rated for your tool’s RPM and marked with the maximum safe speed, look for reinforced construction (fiberglass mesh or metal core) for high-stress jobs, and always use appropriate guards, eye and hearing protection, and follow the tool and disc manufacturer safety instructions

Lifespan depends on material, grit, bond hardness, pressure applied, and duty cycle; aggressive jobs and hard materials wear discs faster, while softer bonds wear faster on soft metals—expect variable life from a few hours of heavy use to many hours for light touch-ups

No; cutting discs are thin and designed for edge cutting, while grinding discs are thicker and built to withstand lateral pressure—using a cutting disc for grinding or vice versa can cause premature failure or breakage and poses a safety risk

Store discs flat in a dry, moderate-temperature environment away from direct sunlight and moisture; inspect before use for cracks, warping, or damage, and remove buildup or clogging by dressing the disc when applicable or replacing if performance degrades