3M 7100138339 Radial Bristle Brush Disc 8 Inches

Product Description

The 3M 7100138339 is a radial bristle brush replacement disc designed for surface preparation, cleaning, and light finishing work. Each disc mounts to a bench motor or similar rotary tool and uses flexible abrasive bristle tips to remove coatings, rust, scale, and surface contamination. The bristle construction allows effective cleaning with minimal applied pressure, reducing the risk of workpiece gouging compared to rigid wire brushes. This disc is sold as a refill pack and includes a universal bench motor adapter for straightforward installation. The 8-inch diameter suits bench-mounted applications common in fabrication shops, HVAC service, plumbing rough-in, and general maintenance environments.

These replacement discs are suited for use on metal, wood, and composite surfaces where wire brush abrasion would pose a risk to the base material or operator. Typical applications include rust and paint removal, weld cleanup, and deburring on pipe, sheet metal, and structural components. The radial bristle design reaches into irregular surfaces and tight profiles that flat abrasive wheels cannot contact. Trade professionals in HVAC, plumbing, and light fabrication commonly use this disc as a safer, longer-lasting alternative to conventional wire cup or wheel brushes in bench-motor setups.

Key Features

• Flexible abrasive bristles clean effectively with minimal applied pressure
• Safe alternative to wire brushes, reducing gouging and bristle-ejection risk
• Compatible with a variety of coatings including rust, paint, and scale
• 8-inch diameter suitable for bench-motor applications
• Includes universal bench motor adapter for quick installation
• Sold as a refill pack for ongoing disc replacement

Compatibility

Designed as a replacement disc for bench motor and rotary tool setups accepting 8-inch radial bristle brush assemblies. Includes a universal bench motor adapter. Verify spindle thread and arbor size before installation.

Installation Notes

Installation should be performed by a qualified technician familiar with bench grinding and rotary abrasive equipment. Power down and lock out the bench motor before mounting or removing any disc. Confirm that the spindle speed rating of the bench motor does not exceed the maximum RPM rating of the disc. Always wear appropriate eye and face protection when operating rotary abrasive tools.

Technical Specifications

• Diameter: 8 inches
• Weight: 6.07 pounds
• Package UOM: Pack
• Minimum Order Quantity: 1
• UPC: 00048011331751

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100138339