3M 7100128936 Brite Finishing Flap Brush 8x4x3 in 5A Fine

Product Description

The 3M 7100128936 is a Brite finishing flap brush designed for light-duty cleaning and surface finishing applications. Individual abrasive sheets are adhered at a 90-degree angle to a central core, creating a flap-style geometry that conforms to irregular surfaces and delivers consistent scratch patterns. The abrasive mineral is fine-grade aluminum oxide, rated at a 5A density with medium hardness. At 8 inches in diameter, 4 inches in face width, and 3 inches in bore size, this brush suits bench grinders and automated finishing equipment used in metalworking and fabrication environments. Installers and fabricators in mechanical, HVAC, and plumbing trades use this type of tool for deburring, blending, and pre-finish cleaning on metal components.

This flap brush is suited for light cleaning and finishing passes on metal, fiberglass, and composite surfaces. Typical applications include weld blending, surface prep before coating or assembly, and removal of light oxidation or mill scale. The fine-grade aluminum oxide mineral makes it appropriate for final finishing passes where a consistent, smooth scratch pattern is required rather than aggressive stock removal. It is sold as an individual unit.

Key Features

• Fine-grade aluminum oxide abrasive mineral for controlled, consistent surface finishing
• Individual sheets adhered at 90 degrees to core for conforming flap-style action
• Medium hardness 5A density rating suited for light-duty passes
• 8 inches x 4 inches x 3 inches dimensions compatible with standard bench grinder and automated finishing setups
• Light-duty construction minimizes aggressive material removal, preserving workpiece dimensions

Compatibility

Designed as an OEM-style flap brush for use on bench grinders and finishing machines accepting an 8-inch diameter, 4-inch face-width brush with a 3-inch bore arbor.

Installation Notes

Mounting and replacement of flap brushes should be performed by qualified personnel following equipment manufacturer guidelines and applicable ANSI safety standards for abrasive products. Power down and lock out the grinder or finishing machine before changing the brush. Verify that the machine spindle speed does not exceed the maximum RPM rating marked on the brush before operation. Eye protection and appropriate PPE are required during use.

Technical Specifications

• Diameter: 8 inches
• Face Width: 4 inches
• Bore Size: 3 inches
• Abrasive Mineral: Aluminum Oxide
• Grade: Fine
• Density: 5A (Medium Hardness)
• Weight: 2.25 pounds
• UPC: 00048011011868
• Sold As: Each

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100128936