3M 7100104978 Ceramic Flap Disc 40 Grit Type 27 5 Inch

Product Description

The 3M 7100104978 is a ceramic abrasive flap disc engineered for aggressive material removal on metal, weld seams, and fabricated surfaces. Rated at 12,100 RPM maximum and built in a Type 27 flat profile, this disc mounts via a standard 5/8-11 arbor hole to angle grinders commonly used in metal fabrication, welding shops, and industrial maintenance. The 40-grit coarse grade paired with ceramic abrasive delivers fast stock removal with extended disc life compared to standard aluminum oxide alternatives. A polyester backing provides dimensional stability under load and heat.

This flap disc suits applications where rapid grinding and blending are performed on carbon steel, stainless steel, and similar ferrous metals. The Type 27 profile positions the abrasive surface nearly flat to the workpiece, making it well suited for surface grinding on flat panels and structural members. It is commonly used by welders, fabricators, and ironworkers performing weld cleanup, deburring, and surface prep ahead of coating or inspection.

Key Features

• Ceramic abrasive grain for high material removal rate and long service life
• 40-grit coarse grade for aggressive stock removal and weld cleanup
• Type 27 flat profile optimized for surface grinding applications
• Polyester backing for stability and resistance to heat distortion
• 5/8-11 arbor hole fits standard angle grinders
• 12,100 RPM maximum speed rating

Compatibility

Designed as a drop-in replacement flap disc for standard angle grinders equipped with a 5/8-11 threaded spindle and accepting a 5-inch disc diameter.

Installation Notes

Install and service abrasive flap discs with the grinder unplugged or the power source locked out before mounting or removal. Verify the tool spindle speed does not exceed the 12,100 RPM maximum rating marked on the disc before operation. Inspect the disc for damage before each use and discard any disc showing delamination, tears, or cracked backing. Use appropriate eye, face, and hand protection per ANSI B11 and applicable site safety requirements.