3M 7100100990 Fibre Disc 787C 36 Grit 4 Inch Roloc

Product Description

The 3M 7100100990 is a 4-inch coated fibre disc in the 787C series, designed for aggressive material removal on hard-to-grind metals. It uses 3M Precision Shaped Grain, a structured abrasive mineral that delivers higher cut rates and cooler grinding temperatures compared to conventional fibre discs. The disc is built with a grinding aid that reduces heat buildup, making it well suited for heat-sensitive alloys. A stiff fibre backing and strong resin bond provide tear resistance and durability under heavy load. Licensed HVAC, welding, and metal fabrication professionals install and use this disc in demanding production and field environments.

This disc is rated for use at up to 12000 RPM and carries a 36-grit designation for fast, aggressive stock removal. It attaches via the Roloc quick-change system, which locks the disc securely to a compatible backup pad without tools, reducing changeover time on the job. Primary applications include weld removal, weld blending, beveling, edge chamfering, and finish refinement on stainless steel and high nickel alloys. It is suited to both shop fabrication and field repair work where consistent cut and disc longevity are priorities.

Key Features

• 3M Precision Shaped Grain delivers higher cut rates and cooler grinding temperatures than conventional fibre discs
• Grinding aid minimizes heat buildup, protecting heat-sensitive alloys during aggressive grinding
• Stiff fibre backing and strong resin bond resist tearing under heavy load
• Roloc quick-change attachment secures disc to backup pad without tools
• 36 grit configuration suited for weld removal, beveling, and edge chamfering
• Rated to 12000 RPM for compatibility with standard angle grinders and die grinders

Compatibility

Designed for use with Roloc-compatible backup pads and angle grinders or die grinders that accept 4-inch quick-change fibre discs. Best suited for stainless steel and high nickel alloys.

Installation Notes

This disc is installed and replaced by metalworkers, welders, and fabricators using Roloc-compatible grinders. Always confirm the grinder RPM rating meets or exceeds the disc maximum RPM before mounting. Inspect the disc for damage before each use and do not use a disc that shows cracks, tears, or delamination. Wear appropriate PPE including a face shield and gloves when operating abrasive grinding equipment.

Technical Specifications

• Disc Diameter: 4 inches
• Grit: 36
• Maximum Speed: 12000 RPM
• Attachment Type: Roloc quick-change
• Abrasive Type: Precision Shaped Grain with grinding aid
• Backing: Stiff fibre
• Weight: 4.272 pounds
• Unit of Measure: Each

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100100990