3M™ Cubitron™ 3 Flap Disc 1169F 4-1/2" x 7/8" 40+ Grit

Re-Engineered 3M Precision-Shaped Grain with Curved Sides. Slices Through Metal Up to 49% Faster. Heavyweight Y-Weight Polyester Backing.

The 3M™ Cubitron™ 3 Flap Disc 1169F (4-1/2" x 7/8", 40+ Grit) brings next-generation ceramic cutting speeds, extreme material removal capacity, and single-step blending performance directly to your structural steel fabrication yard, pressure vessel welding shop, or heavy equipment maintenance bay. Purpose-built to eliminate the slow cutting speeds of legacy alumina zirconia discs, the frequent tool change-outs required when switching from grinding wheels to fiber discs, and the risk of gouging expensive stainless steel workpieces, this premium 40+ coarse grit ceramic flap disc sets an absolute industry benchmark. It equips structural welders, pipefitters, sheet metal fabricators, and industrial mechanics with an ultra-aggressively cutting abrasive asset explicitly optimized to grind heavy weld seams, bevel structural pipe edges, remove mill scale, and prepare surfaces in a single pass.

Revolutionary grain geometry and heavy-duty structural backing serve as the engineering foundation for the 1169F series. Powered by re-engineered 3M Precision-Shaped Grain featuring curved sides, the ceramic micro-crystalline structures continually fracture under medium-to-high pressure to reveal razor-sharp edges that slice cleanly through metal rather than plowing through substrate. This self-sharpening mechanical action enables the disc to remove up to 49% more total material than previous-generation 3M Cubitron II flap discs while operating cooler. Built with a durable Y-weight polyester backing, individual overlapping flaps break down uniformly to expose fresh mineral throughout the life of the disc, delivering a smooth, controllable finish that reduces secondary finishing steps on standard 4-1/2" angle grinders.

Why the 3M™ Cubitron™ 3 1169F 40+ Grit Flap Disc Leads the Metalworking Bay:

• Re-Engineered Precision-Shaped Grain: Advanced curved-edge ceramic grain technology fractures cleanly into razor-sharp points for unmatched cut rates.
• Up to 49% Higher Material Removal: Proven to out-perform legacy 969F and standard zirconia flap discs, significantly lowering your total abrasive consumption spend.
• Two-in-One Grinding & Blending: Coarse 40+ grit removes heavy weld beads aggressively while leaving a refined finish that eliminates separate blending steps.
• Heavy-Duty Y-Weight Polyester Backing: Rigid flap construction resists edge fraying during intense beveling and heavy deburring applications.
• Universal 7/8" Center Hole Arbor Fitment: Drops directly onto standard 4-1/2" angle grinders with conventional flange mounting hardware.

Specifications