3M 7000144121 Flap Disc 577F 7 Inch 40 Grit Alumina Zirconia

Product Description

The 3M 7000144121 is the 577F alumina zirconia flap disc designed for high-pressure metalworking applications requiring both cutting and blending in a single pass. The disc measures 7 inches in diameter and uses 40-grit alumina zirconia mineral combined with a grinding aid to deliver aggressive stock removal across all metal types. Heavyweight polyester-backed flaps provide the structural integrity needed for demanding tasks such as weld removal, sharp-edge work, and beveling. Licensed metalworkers and fabricators rely on this disc where consistent, blended finishes are required without switching abrasives mid-job.

This flap disc is suited for heavy-duty fabrication and metalworking environments — both industrial and job-site settings. It performs well on weld seam removal, deburring, and edge preparation on structural steel, stainless steel, and other metals. The quick-change design reduces downtime during disc swaps, making it a practical choice for production grinding operations where throughput matters. It is sold individually and intended for use on standard angle grinders compatible with 7-inch diameter flap discs.

Key Features

• Alumina zirconia mineral with grinding aid cuts faster and lasts longer than aluminum oxide on metal
• Flap construction combines grinding and blending into one step, reducing total abrasive usage
• Heavyweight polyester backing withstands high-pressure applications including beveling and sharp-edge work
• Quick-change disc design simplifies and speeds up disc replacement
• 40-grit rating delivers aggressive material removal with a workable blended finish

Compatibility

Designed as an OEM-style replacement flap disc for use on 7-inch angle grinders rated for flap disc operation in metalworking and fabrication applications.

Installation Notes

Flap discs of this type are installed and serviced by metalworkers, welders, and fabricators using standard angle grinders. Before mounting, confirm the grinder is rated for the disc diameter and operating RPM. Disconnect power from the grinder before changing discs. Do not exceed the maximum RPM marked on the disc or grinder guard.

Technical Specifications

• Disc Diameter: 7 inches
• Grit: 40
• Abrasive Mineral: Alumina Zirconia
• Backing Material: Heavyweight Polyester
• Disc Type: Flap
• Weight: 0.54 pounds
• UOM: Each

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7000144121