Norton 66623399004 4-1/2" x 7/8" 40 Grit Type 27 Flap Disc

Alternating aluminum oxide (green) and zirconia alumna (blue) flaps make these discs great for difficult-to-grind materials (aluminum, brass, bronze, stainless, carbon steel, and titanium) and applications requiring an economical option. Ideal when purchasing criteria is a good-performing, economically priced, general purpose disc. Versatile 36, 40, 60, 80, and 120 grit range fills most material and application requirements, from roughing to blending. New resin system and Y-weight polyester flaps offer improved base adhesion and 30 percent+ improvement in life over key competitors’ aluminum oxide flap discs. Stand up on light- to moderately-demanding applications. New grain coating provides longer life and faster cut rate. Type 29 conical and Type 27 high density flat: fiberglass back for high strength, lightweight, absorb vibration. Type 27 flat: flexible plastic back wears away as the flap disc grinds, allowing full use of flap; discs are easily trimmed; conformable; less pressure needed at peak performance.