3M 7100109879 Fibre Disc 787C 4.5 in 36 Grit Coated Abrasive

Product Description

The 3M 7100109879 is a coated abrasive fibre disc in the 787C series, engineered for rapid stock removal on hard-to-grind metals. It measures 4.5 inches in diameter with a 7/8 inch arbor hole and carries a 36 grit designation for aggressive cutting. The disc uses 3M Precision Shaped Grain, a mineral geometry that delivers higher cut rates and cooler surface temperatures compared to conventional alumina fibre discs. A built-in grinding aid further reduces heat buildup, making this disc well suited for stainless steel and high nickel alloys where heat-related discoloration or metallurgical damage is a concern. A stiff fibre backing and strong resin bond resist tearing under heavy load.

This disc is intended for weld removal, blending, beveling, edge chamfering, and finish refinement on stainless steel, high nickel alloys, and similarly hard metals. It is a practical choice for fabrication shops, maintenance welders, and metalworkers who cycle through multiple parts per shift and need a disc that outlasts conventional fibre products without sacrificing cut rate. Sold individually; minimum order quantity is 10 units per the supplier packaging specification.

Key Features

• 3M Precision Shaped Grain delivers higher cut rates and cooler grinding action versus conventional fibre discs
• Grinding aid minimizes heat buildup, protecting heat-sensitive alloys like stainless steel and high nickel alloys
• Stiff fibre backing with strong resin bond resists tearing during heavy weld grinding and beveling
• 36 grit provides aggressive stock removal for weld grinding, blending, and edge chamfering
• 4.5 inch diameter with 7/8 inch arbor fits standard angle grinders using compatible disc pad face plates and hubs
• Extended disc life helps reduce per-part abrasive cost in high-volume applications

Compatibility

Compatible with 3M disc pad face plates and hubs sold separately. Designed for use on angle grinders accepting 4.5 inch fibre discs with a 7/8 inch arbor.

Installation Notes

Installation of fibre discs should be performed by qualified personnel following ANSI B7.1 and grinder manufacturer guidelines. Inspect the disc for damage before mounting and ensure the grinder RPM rating meets or exceeds the disc RPM rating. Power down and disconnect the grinder from its power source before changing discs. Never use a fibre disc without a properly rated backing pad.