Klingspor 12000 SM 611 Flap Wheels LS 309 X, 100 x 30 x 21 mm, Grit 40, 5 Pieces

Metal fabricators and welders rely on the Klingspor 12000 SM 611 flap wheels for aggressive stock removal and smooth finishing on steel and stainless steel. Each wheel measures 100 mm in diameter with a 30 mm width and 21 mm bore, fitting standard angle grinders and straight grinders. The LS 309 X zirconia alumina grain in grit P40 cuts fast and stays sharp, while the cotton backing with synthetic resin bond provides flexibility and durability. This pack contains 5 flap wheels, ideal for deburring, weld blending, and surface preparation in workshops and on-site jobs.

Key specifications

• Product type: Flap wheel
• Series: SM 611
• Abrasive grain: Zirconia alumina (LS 309 X)
• Grit size: P40
• Wheel diameter: 100 mm
• Wheel width: 30 mm
• Bore diameter: 21 mm
• Backing material: Cotton
• Bonding agent: Synthetic resin
• Max. permissible speed: 12,200 RPM
• Max. operating speed: 64 m/s
• Application: General grinding, deburring, surface finishing
• Suitable materials: Steel, stainless steel, non-ferrous metals, plastics, wood
• Packaging quantity: 5 pieces
• Tool compatibility: Angle grinders, straight grinders (with appropriate arbor)
• Safety standard: EN 13743

Why choose it

The zirconia alumina abrasive self-sharpens under heat and pressure, delivering consistent cut rates and a longer life than standard aluminum oxide. The cotton backing allows the flaps to flex, conforming to contours and reducing gouging. This makes the SM 611 ideal for blending welds, removing mill scale, and finishing curved surfaces without excessive material removal.

Ideal use cases

• Deburring and edge breaking on steel and stainless steel components
• Weld seam blending and smoothing in fabrication shops
• Surface preparation before painting or coating
• Light stock removal and shaping on non-ferrous metals and plastics
• Cleaning and finishing wood surfaces

Good to know

Always observe the maximum operating speed of 12,200 RPM and use appropriate personal protective equipment. The 21 mm bore fits most standard backing pads, but ensure your grinder's arbor matches or use a suitable adapter. Store flap wheels in a dry place away from direct sunlight to maintain bonding integrity.