3M 7100243875 Flap Disc 120 Grit Ceramic Type 27

Product Description

The 3M 7100243875 is a Type 27 ceramic flap disc designed for grinding, blending, and finishing on metal and fabricated surfaces. It measures 4.5 inches in diameter with a 5/8-11 threaded center hole for direct mounting to standard angle grinders. The 120-grit ceramic abrasive delivers consistent cut rates and extended disc life on ferrous and non-ferrous metals. A plastic backing plate provides rigid support during flat and surface grinding passes. At 0.23 pounds, the disc is lightweight without sacrificing structural integrity under sustained load.

This flap disc is suited for use in metal fabrication shops, welding operations, and light structural work where surface blending and weld dressing are routine tasks. The Type 27 flat profile is the standard choice when working on flat or slightly contoured stock, tabletops, and structural steel sections. Licensed fabricators, ironworkers, and maintenance welders typically reach for a 120-grit disc when transitioning from heavy material removal to a pre-finish or paint-prep surface condition.

Key Features

• 120-grit ceramic abrasive for consistent cut rate and extended service life
• Type 27 flat profile optimized for surface grinding and weld blending
• 5/8-11 threaded hole fits standard angle grinder spindles directly
• Plastic backing plate maintains disc rigidity during flat-surface work
• Lightweight at 0.23 pounds for reduced operator fatigue during extended use
• 4.5-inch diameter fits common 4.5-inch angle grinder guards without modification

Compatibility

Designed for use with standard 4.5-inch angle grinders equipped with a 5/8-11 threaded spindle. Confirm tool guard and RPM rating meet or exceed the disc maximum rating before mounting.

Installation Notes

Installation should be performed by a qualified operator familiar with abrasive wheel safety per ANSI B7.1 guidelines. Inspect the disc for cracks or damage before mounting and never use a damaged disc. Secure the disc firmly to the grinder spindle using the appropriate flange and ensure the guard is in place before powering on. Always wear appropriate PPE including a face shield, gloves, and hearing protection when operating angle grinders with flap discs.