3M 7100309906 Cubitron 3 Fiber Disc 36+ Grit 7 Inch

Product Description

The 3M 7100309906 is a closed-coat fiber disc built on the Cubitron 3 1187C platform, designed for heavy material removal on metal. It uses Re-Engineered Precision Shaped Grain, a proprietary abrasive technology that features sharp, angular structures. These structures continuously fracture to expose fresh cutting points, allowing the disc to run cooler, wear evenly, and maintain aggressive cut rates across its full service life. The result is faster stock removal with less operator pressure compared to conventional abrasive discs. A stiff fiber backing and strong resin bond deliver the durability needed for sustained grinding operations.

This disc is suited for medium to high-pressure grinding, weld removal, and beveling on mild and carbon steels. It is engineered to perform in both manual and robotic grinding operations. The closed-coat construction and 36 plus grit rating make it appropriate for aggressive initial cuts where surface finish is secondary to material removal rate. Fabricators, welders, and metal finishing professionals are the primary users. The design reduces metal discoloration and lowers the risk of stress cracks on mild or carbon steels, which matters in precision fabrication environments.

Key Features

• Re-Engineered Precision Shaped Grain continuously fractures to maintain sharp cutting points throughout disc life
• Delivers up to 51 percent faster initial cut rate and up to 61 percent faster sustained cut rate compared to the Cubitron II Fibre Disc 982C at 36 plus grit
• Stiff fiber backing and strong resin bond resist tearing under medium to high grinding pressure
• Compatible with robotic grinding operations in addition to manual use
• Reduces operator pressure required, helping minimize metal discoloration and stress cracking on mild or carbon steels
• Closed-coat construction maximizes abrasive mineral coverage for consistent stock removal

Compatibility

Designed as an OEM-style replacement and upgrade path from the Cubitron II Fibre Disc 982C 36 plus grit. Suitable for use on angle grinders and disc grinders fitted with a 7 inch disc backing pad or flap disc arbor appropriate for fiber discs.

Installation Notes

Fiber discs of this type are mounted and changed by metalworking professionals and fabricators using standard angle grinder tooling. Always power down and disconnect the grinder before mounting or removing a disc. Inspect the backing pad for damage before installation, and confirm the grinder RPM rating meets or exceeds the disc RPM rating. Wear appropriate PPE including face shield and gloves during operation and disc changes.

Technical Specifications

• Disc Diameter: 7 inches
• Grit: 36 plus
• Coat Type: Closed Coat
• Abrasive Technology: Re-Engineered Precision Shaped Grain
• Backing: Stiff Fiber
• Weight: 3.367 pounds
• Unit of Measure: Box
• Minimum Order Quantity: 4
• UPC: 00068060664532

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100309906