3M 7100138340 Radial Bristle Brush Disc 80 Grit 8 in

Product Description

The 3M 7100138340 is a radial bristle brush replacement disc designed to perform light surface preparation, cleaning, and finishing work across a wide range of materials. The disc measures 8 inches in diameter and features an 80-grit abrasive rating, making it well-suited for removing coatings, scale, and surface oxidation with minimal applied pressure. The flexible bristle construction conforms to irregular surfaces and contours, reducing the risk of gouging or overcutting. Each pack includes a universal bench motor adapter, allowing the disc to be mounted quickly on standard bench grinder setups. HVAC, plumbing, and mechanical trades commonly use this type of disc for tube cleaning, weld prep, and deburring tasks.

This replacement disc is suited for residential and light commercial maintenance applications where surface cleanliness and material preservation matter. The 80-grit rating provides moderate cutting action appropriate for cleaning metal surfaces, removing mill scale, or stripping light corrosion from pipe, sheet metal, or fittings. It serves as a direct alternative to wire wheel brushes in situations where wire shedding is a safety concern or where the base material is more delicate. The included bench motor adapter adds versatility for shop use.

Key Features

• 8-inch diameter disc fits standard bench motor setups with included universal adapter
• 80-grit abrasive rating delivers moderate surface cleaning and coating removal
• Flexible radial bristle design conforms to contoured and irregular surfaces
• Safe alternative to wire brushes — eliminates wire shedding hazard
• Effective on a variety of coatings, scale, and surface oxidation with minimal pressure
• Pack format supports tool-room and field restocking

Compatibility

Designed as an OEM-style replacement radial bristle disc for use with standard bench motor grinders equipped with a compatible arbor. The included universal bench motor adapter broadens fitment across common bench grinder configurations.

Installation Notes

Installation and disc changes should be performed by a qualified technician following the bench grinder manufacturer's mounting instructions. Power down and disconnect the bench motor from its power source before removing or installing any disc. Inspect the disc and adapter for damage before each use, and confirm all fasteners are secure before starting the motor. Eye protection and appropriate PPE are required during operation.

Technical Specifications

• Disc Diameter: 8 inches
• Grit Rating: 80
• Package Weight: 7 pounds
• Unit of Measure: Pack
• Minimum Order Quantity: 1
• UPC: 00048011331768

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100138340