3M 7100100960 Fibre Disc 787C 4 Inch 80 Grit

Product Description

The 3M 7100100960 is a 4-inch coated fibre disc in the 787C series, designed for high-speed grinding and finishing on hard-to-grind metals. Built around 3M Precision Shaped Grain, it delivers a faster cut rate and cooler running temperatures than conventional fibre discs. A built-in grinding aid further reduces heat buildup, making this disc a reliable choice for stainless steel and high nickel alloy work. The Roloc quick-change attachment locks the disc securely to a compatible backup pad without tools, reducing changeover time. Licensed HVAC, fabrication, and metalworking professionals will find this disc well-suited to heavy-duty weld removal and surface preparation tasks.

This disc is primarily used in metal fabrication, welding shops, and maintenance environments where stainless steel or high nickel alloys require aggressive stock removal, weld grinding, beveling, edge chamfering, or finish blending. At 80 grit, it sits in the medium-to-coarse range, appropriate for initial weld removal and blending before transitioning to finer finishing steps. The 12000 RPM maximum speed rating supports use with standard angle grinders and die grinders equipped with a Roloc-compatible backup pad.

Key Features

• 3M Precision Shaped Grain provides higher cut rates and cooler grinding versus conventional abrasive grains
• Grinding aid reduces heat buildup, protecting heat-sensitive alloys like stainless steel and high nickel grades
• Stiff fibre backing and strong resin bond resist tearing during heavy-load applications
• Roloc quick-change attachment secures the disc without tools, enabling fast pad changes
• Suited for weld removal, beveling, edge chamfering, blending, and finish refinement
• 80 grit rating balances aggressive stock removal with controlled surface finish

Compatibility

Designed for use with Roloc-compatible backup pads on angle grinders and die grinders rated for a minimum of 12000 RPM. Optimized for stainless steel and high nickel alloy substrates.

Installation Notes

Installation and disc changes must be performed with the grinder powered off and unplugged or air supply disconnected. Verify the backup pad and grinder spindle speed meet or exceed the 12000 RPM disc rating before mounting. Wear appropriate PPE including eye protection and gloves when operating grinding equipment. Follow applicable ANSI B11 and OSHA 1910.215 guidelines for abrasive wheel machinery.

Technical Specifications

• Disc Diameter: 4 inches
• Grit: 80
• Maximum Speed: 12000 RPM
• Attachment Type: Roloc quick-change
• Abrasive Type: 3M Precision Shaped Grain with grinding aid
• Backing: Stiff fibre with resin bond
• Package Weight: 4.25 pounds
• Package Length: 13.59 inches
• Package Width: 11.88 inches
• Package Height: 6.2 inches
• UPC: 076308897111

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100100960