The superior performance and durability of 3M Precision Shaped Grain is enhanced by a uniquely designed heavy Y-weight poly-cotton backing that enables controlled, even wear with no premature dulling or glazing, so operators can accomplish more throughput per disc. Flap discs run on a right angle grinder. For attachment, 4-1/2" flap discs with a center hole require a flap disc adapter nut, and 7" discs require a flap disc holder (both sold separately). Discs with a 4-1/2" diameter have a max RPM of 13,300, and 7" discs have a max RPM of 8,600. Use Type 27 on flat surfaces or outside edgework. 3M Cubitron II products have raised the bar for high-performing abrasives. 3M Precision Shaped Grain outcuts and outlasts conventional ceramic industrial abrasives and requires less grinding force to achieve superior performance. The result is that operators can grind faster and complete more parts per disc with less muscle-work and fatigue.

To create 3M Precision Shaped Grain, 3M engineers used proprietary technology to fracture its ceramic abrasive grain, forming triangular structures with sharp peaks and edges that maximize cutting potential. These peaks slice through metal like a knife through butter, rather than gouging or plowing as traditional abrasives do, and continuously self-sharpen as the points break off. This generates a super-fast cut and lessens heat build-up due to friction, reducing heat-related stress cracks and discoloration. 3M Precision Shaped Grain also wears evenly, and because the abrasive itself stays cooler and sharper, 3M Cubitron II products last significantly longer than their conventional ceramic counterparts, ensuring extended high performance in production applications.