3M 7000121184 Finishing Flap Brush 8x4x3 Medium

Product Description

The 3M 7000121184 is a finishing flap brush designed for light-duty cleaning and finishing applications in trade and industrial settings. The brush measures 8 inches in diameter by 4 inches in width with a 3-inch arbor hole. Individual abrasive sheets are adhered at a 90-degree angle to the core, allowing the flaps to contact the workpiece with consistent pressure and controlled cut. The abrasive mineral is medium-grade aluminum oxide, and the brush carries a density rating of 5A Medium, indicating medium hardness suitable for moderate surface finishing work. Fabricators, maintenance technicians, and metalworkers commonly use this type of brush for deburring, blending, and surface conditioning tasks.

This flap brush is intended for light-duty finishing and cleaning operations on metal, composite, or similar hard surfaces. The aluminum oxide abrasive at medium grade makes it appropriate for general surface prep, weld blending, and cleaning passes where aggressive stock removal is not required. It is sold individually and suited for use on bench-mounted or pedestal grinders and compatible power tools that accept a 3-inch arbor. Typical applications include shop fabrication environments, maintenance and repair operations, and production finishing lines.

Key Features

• Individual abrasive flap sheets adhered at 90 degrees to the core for consistent surface contact
• Medium-grade aluminum oxide abrasive mineral for controlled finishing and cleaning
• 5A Medium density rating for medium hardness performance
• 8-inch diameter by 4-inch face width with 3-inch arbor hole
• Light-duty design suited for deburring, blending, and surface conditioning
• Sold individually per unit

Compatibility

Designed for use on bench or pedestal grinders and power tools that accept a 3-inch arbor. Verify spindle speed rating of your equipment against the rated speed of the brush before mounting.

Installation Notes

Mounting and use of flap brushes should be performed by qualified personnel familiar with abrasive wheel safety. Power down and lock out the grinder or power tool before mounting or removing the brush. Confirm the machine spindle speed does not exceed the maximum rated RPM marked on the brush. Always install the appropriate flange hardware and follow ANSI B7.1 safety requirements for abrasive wheel mounting.

Technical Specifications

• Diameter: 8 inches
• Face Width: 4 inches
• Arbor Hole: 3 inches
• Abrasive Mineral: Aluminum Oxide
• Grade: Medium
• Density: 5A Medium
• Duty Rating: Light Duty
• Weight: 2.3 pounds
• UPC: 00048011011851
• Sold As: Each

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7000121184