Abrasive discs for grinders

Roughing, finishing, and sanding metal surfaces require abrasive discs specifically tailored to the specific needs of the job. These consumables determine the quality of the final result and the overall efficiency of the work process.

The grit size of the disc, indicated by a number that generally ranges from 24 to 120, is crucial: coarser grits (lower numbers) remove material quickly but leave rougher finishes, while finer grits produce smoother surfaces but require more passes for significant material removal.

The disc diameter should match the machine's specifications, with standard sizes ranging from 115 to 230 mm for the most common applications. The abrasive material varies depending on the application: aluminum oxide is versatile for ferrous metals, silicon carbide excels on non-ferrous materials, while zirconia offers superior durability for heavy-duty work.

The backing structure affects the disc's flexibility. Fiber backings provide rigidity for aggressive roughing, while fabric backings offer greater adaptability to uneven surfaces. The center hole must match the grinder's shaft exactly to ensure secure mounting and vibration-free rotation.

The maximum permitted speed , indicated in RPM (revolutions per minute), must never be exceeded to avoid dangerous breakages during use. Makita quality discs are tested to withstand the mechanical and thermal stresses generated during intensive use .

The pressure applied during operation affects both the effectiveness of the abrasion and the life of the disc: excessive pressure causes overheating and premature wear, while too little pressure reduces work efficiency. The correct contact angle between the disc and the surface improves results and reduces the risk of accidents or damage to the material being worked.