3M 7000119478 Flap Disc 577F 7 Inch 40 Grit

Product Description

The 3M 7000119478 is a Type 29 flap disc in the 577F series, engineered for high-pressure metalworking applications including weld removal, beveling, and sharp-edge finishing. The disc combines alumina zirconia mineral with a grinding aid on heavyweight polyester-backed flaps, delivering faster material removal than standard aluminum oxide abrasives. At 7 inches in diameter and 40 grit, it removes weld beads and heavy stock while simultaneously blending the surface, eliminating the need for a separate finishing step. Weighing 0.84 pounds, it is used by welders, fabricators, and metal finishing tradespeople.

This flap disc is suited to demanding industrial and fabrication environments where high stock removal and a consistent blended finish are required in a single operation. Typical applications include structural steel fabrication, pipeline work, heavy equipment repair, and general metalworking. The 40 grit rating makes it appropriate for aggressive grinding passes on ferrous and non-ferrous metals where surface prep speed is the priority.

Key Features

• Alumina zirconia mineral with grinding aid cuts faster than aluminum oxide across ferrous and non-ferrous metals
• Heavyweight polyester-backed flaps withstand high-pressure contact for extended disc life on demanding tasks
• Flap design combines grinding and blending in one pass, reducing total process steps
• 7 inch diameter and 40 grit rating suited for aggressive weld removal and beveling
• Quick-change disc design reduces changeover time at the grinder

Compatibility

Designed as an OEM-style replacement flap disc for use on standard 7 inch angle grinders and variable-speed grinders accepting Type 29 flap disc configurations.

Installation Notes

Flap discs of this diameter are installed and serviced by welders and metal fabricators using angle grinders rated for the disc size. Always power down and unplug the grinder before mounting or removing the disc. Verify that the grinder spindle speed rating meets or exceeds the disc maximum RPM before operation. Wear appropriate PPE including a face shield and gloves during grinding operations.

Technical Specifications

• Diameter: 7 inches
• Grit: 40
• Abrasive Mineral: Alumina Zirconia
• Backing Material: Heavyweight Polyester
• Disc Type: Flap
• Weight: 0.84 pounds

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7000119478