3M 7100109859 Cubitron Ii 987C Fibre Disc 4.5 in 60 Grit

Product Description

The 3M 7100109859 is a coated fibre disc from the Cubitron II 987C line, engineered for medium to heavy-duty grinding, weld grinding, and beveling applications. It uses 3M Precision-Shaped Grain, a triangular ceramic abrasive that maintains sharp cutting points throughout the disc life, delivering a high cut rate with reduced grinding pressure. The stiff fiber backing and strong resin bond resist tearing under sustained load. A built-in grinding aid manages heat at the work surface, making this disc suitable for heat-sensitive alloys. The disc measures 4.5 inches in diameter and is rated at 60 grit.

This disc is designed for fabrication shops, structural steel work, and production grinding environments where uptime and throughput matter. Typical applications include weld seam removal, edge beveling, and surface prep on steel and stainless. The combination of durable backing and long-lasting abrasive grain reduces disc change frequency, which is particularly valuable in robotic or pressure-assisted grinding setups where changeovers carry real downtime costs. Licensed trades and fabrication professionals working to AWS or shop-specific weld quality standards will find the cut consistency useful for meeting surface finish requirements efficiently.

Key Features

• 3M Precision-Shaped Grain holds sharp cutting edges longer than conventional abrasive minerals, sustaining cut rate over the disc life
• High cut rate with reduced grinding pressure lowers operator fatigue during extended use
• Stiff fiber backing and strong resin bond provide tear resistance in high-pressure weld grinding and beveling
• Integrated grinding aid minimizes heat buildup, protecting heat-sensitive alloys from discoloration or metallurgical changes
• Reduced disc change frequency cuts downtime in robotic and pressure-assisted applications

Compatibility

Designed as an OEM-style coated fibre disc replacement for 4.5-inch angle grinders and disc grinders used in metal fabrication and weld grinding applications.

Installation Notes

Installation of fibre discs should be performed by qualified grinding operators following ANSI B11.9 and grinder manufacturer guidelines. Always ensure the grinder is unplugged or de-energized and the guard is properly fitted before mounting or removing a disc. Inspect the disc for damage before each use and never exceed the maximum RPM rating marked on the disc or grinder. Proper backing pad condition is essential for consistent performance and safe operation.

Technical Specifications

• Disc Diameter: 4.5 inches
• Grit: 60
• Abrasive Type: Precision-Shaped Grain (Ceramic)
• Backing: Stiff Fiber
• Construction: Coated
• Package Length: 8.5 inches
• Package Width: 5.5 inches
• Package Height: 10.13 inches
• Weight: 2.505 pounds
• UPC: 051125872527

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100109859