3M 7100138332 Radial Bristle Brush 8x1x1.25 in 50 Grit

Product Description

The 3M 7100138332 is a radial bristle brush engineered for surface preparation, cleaning, and light deburring across a wide range of industrial and trade applications. Measuring 8 inches in diameter by 1 inch wide with a 1-1/4 inch arbor hole, this brush uses aluminum oxide and Cubitron abrasive grain bonded into flexible bristle segments that deliver consistent cut at 50 grit. The radial design allows the abrasive tips to contact the workpiece with minimal applied pressure, reducing operator fatigue and the risk of workpiece damage. A universal bench motor adapter is included in the package, expanding compatibility with common bench-mounted drive units.

This brush is suited for metalworking shops, HVAC fabrication work, plumbing prep, and general maintenance tasks where wire brush contamination or surface gouging is a concern. It cleans oxides, scale, rust, and light coatings from metal substrates without embedding wire fragments that can compromise welds or coatings. Typical users include pipefitters, sheet metal workers, and maintenance technicians working on steel, stainless, aluminum, and similar metals. The flange configuration supports secure mounting on standard bench motors and right-angle grinders with the appropriate arbor.

Key Features

• Aluminum oxide and Cubitron abrasive grain bristles deliver consistent surface action at 50 grit
• Radial bristle construction contacts surfaces at the abrasive tip, requiring minimal pressure
• Safe alternative to wire brushes — eliminates wire fragment contamination risk
• 8 inches x 1 inches x 1-1/4 inches arbor configuration fits standard bench motors
• Universal bench motor adapter included for expanded drive unit compatibility
• Works on a variety of coatings and base materials including steel and aluminum

Compatibility

Designed for use with bench motors and compatible rotary drive tools accepting a 1-1/4 inch arbor. The included universal bench motor adapter broadens fitment across common bench-mounted units.

Installation Notes

Installation and mounting should be performed by qualified personnel familiar with rotary abrasive tool safety. Power down and lock out the drive unit before mounting or removing the brush. Verify that the drive unit RPM rating does not exceed the maximum rated speed of the brush before operation. Eye protection and appropriate PPE are required during use per standard abrasive tool safety guidelines.

Technical Specifications

• Abrasive Mineral: Aluminum Oxide and Cubitron Abrasive Grain
• Grit: 50
• Diameter: 8 inches
• Width: 1 inch
• Arbor Hole: 1-1/4 inches
• Weight: 1.7 pounds
• Unit of Measure: Each

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100138332