3M 7100185244 Fibre Disc 787C 5 Inch 120 Grit

Product Description

The 3M 7100185244 is the 787C Fibre Disc, a coated abrasive disc engineered for rapid stock removal on hard-to-grind metals. It measures 5 inches in diameter with a 7/8 inch arbor hole and carries a 120 grit rating. The disc is built around 3M Precision Shaped Grain, a structured mineral that delivers higher cut rates and a cooler cutting action compared to conventional alumina fibre discs. A grinding aid is incorporated into the construction to further reduce heat buildup at the workpiece surface. Stiff fibre backing and a strong resin bond resist tearing under aggressive use. Licensed HVAC techs, fabricators, and metalworking professionals reach for this disc for demanding weld removal and blending tasks.

The 787C is intended for use on stainless steel and high nickel alloys, where heat sensitivity and work hardening make conventional abrasives less effective. Typical applications include weld grinding, weld blending, beveling, edge chamfering, and finish refinement in both shop and field environments. The disc is compatible with 3M disc pad face plates and hubs, which are sold separately. It suits residential and commercial fabrication workflows as well as maintenance and repair operations where surface prep quality directly affects weld integrity or coating adhesion.

Key Features

• 3M Precision Shaped Grain delivers higher cut rates and cooler cut than conventional fibre discs
• Grinding aid reduces heat buildup, protecting heat-sensitive alloys from discoloration and distortion
• Stiff fibre backing and strong resin bond provide durability and tear resistance under heavy load
• 5 inch diameter with 7/8 inch arbor for broad compatibility with standard angle grinders and disc pads
• 120 grit rating suits weld blending, beveling, and finish refinement steps
• Compatible with 3M disc pad face plates and hubs (sold separately)

Compatibility

Compatible with 3M disc pad face plates and hubs sold separately. Designed for use on stainless steel and high nickel alloys with standard angle grinders accepting a 5 inch, 7/8 inch arbor disc.

Installation Notes

This disc is installed and operated by metalworking professionals, fabricators, and maintenance trades using angle grinders rated for the disc diameter and RPM. Verify the grinder guard is in place and that the tool RPM rating meets or exceeds the disc maximum before mounting. Inspect the disc for damage prior to each use and discard any disc that shows cracking, delamination, or torn backing. Follow ANSI B11 and applicable shop safety standards for abrasive wheel operation, including the use of appropriate eye, face, and hand protection.

Technical Specifications

• Disc Diameter: 5 inches
• Arbor Size: 7/8 inch
• Grit: 120
• Abrasive Type: 3M Precision Shaped Grain with grinding aid
• Backing: Stiff fibre
• Bond: Resin
• Package Weight: 4.265 pounds
• Package Length: 11.21 inches
• Package Width: 6.7 inches
• Package Height: 6.95 inches
• UOM: Each
• UPC: 638060303905

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100185244