3M 7100100991 Roloca 782C Fibre Disc 80 Grit 4 Inch

Product Description

The 3M 7100100991 is a Roloca 782C coated fibre disc engineered for high-speed material removal on carbon steel. Built around 3M Precision Shaped Grain abrasive technology, it delivers faster cut rates and longer service life than conventional fibre discs. Rated at 12000 RPM with an 80-grit surface on a 4-inch diameter backing, this disc is designed for demanding metalworking applications including weld removal, bevel grinding, edge chamfering, and surface blending. The stiff fibre backing combined with a strong resin bond resists tearing under load, making it a reliable choice for sustained heavy-duty use. Licensed tradespeople and fabrication shops installing it will find the tool-free Roloca attachment a workflow advantage.

This disc is suited for carbon steel fabrication and weld finishing in industrial, commercial, and job-site environments. Typical applications include weld grinding, blending, and finish refinement on structural steel components. The Roloca attachment system secures the disc to a compatible backing pad without tools, reducing changeover time during production work. The 80-grit specification positions it as a coarse-to-medium cut option, appropriate for stock removal and pre-finishing passes rather than final surface finishing.

Key Features

• 3M Precision Shaped Grain abrasive delivers higher cut rates and longer disc life compared to conventional abrasive grains
• Rated to 12000 RPM for use with standard angle grinders and disc grinders
• Stiff fibre backing and strong resin bond resist tearing and deformation under heavy load
• Tool-free Roloca attachment locks the disc securely onto a compatible backing pad
• 80-grit surface handles weld removal, beveling, chamfering, and blending in a single disc type
• Long-lasting abrasive mineral helps lower cost-per-part on high-volume applications

Compatibility

Designed for use with Roloca-compatible backing pads on standard angle grinders and disc grinders rated for 4-inch coated fibre discs at or above 12000 RPM.

Installation Notes

Installation and disc changes must be performed with the grinder fully powered off and unplugged or locked out per applicable safety procedures. Verify the grinder speed rating meets or exceeds the 12000 RPM disc rating before mounting. Inspect the backing pad for wear or damage before attaching the disc. Always use appropriate personal protective equipment including eye protection and gloves when operating grinding equipment.

Technical Specifications

• Diameter: 4 inches
• Grit: 80
• Maximum Speed: 12000 RPM
• Abrasive Type: 3M Precision Shaped Grain
• Backing Type: Fibre
• Attachment System: Roloca (tool-free)
• Unit Weight: 3.272 pounds
• UOM: Each

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100100991