3M 7100049935 Ceramic Flap Disc 40 Grit Type 29

Product Description

The 3M 7100049935 is a Type 29 ceramic flap disc designed for aggressive material removal on metal, weld seams, and fabricated surfaces. It carries a 40-grit, very coarse grade rating and uses a cloth backing for durability under high-load grinding conditions. The ceramic abrasive delivers consistent cut rates and resists heat buildup better than aluminum oxide alternatives, making it a reliable choice for grinding, blending, and finishing in a single pass. Rated to 13,300 RPM, this disc is sized at 4.5 inches in diameter with a 5/8-11 arbor hole for direct mounting to standard angle grinders. Metal fabricators and welders are the primary installers of this disc.

This flap disc is suited for use on carbon steel, stainless steel, and other hard metals in both shop and field fabrication environments. The Type 29 conical geometry positions the abrasive flaps at an angle to the workpiece, concentrating grinding pressure for faster stock removal compared to a flat Type 27 profile. It is part of the 3M 967A series and is sold individually. Typical applications include weld cleanup, deburring, surface conditioning, and rust removal on structural steel and pipe.

Key Features

• Ceramic abrasive for high cut rate and extended disc life under heat
• 40-grit very coarse grade for rapid stock removal and weld seam grinding
• Type 29 conical profile concentrates grinding pressure at the work surface
• Cloth backing provides flexibility and durability during aggressive grinding passes
• 13,300 RPM maximum speed rating compatible with standard 4.5-inch angle grinders
• 5/8-11 arbor hole for tool-free mounting on most angle grinder spindles

Compatibility

Designed for use on standard 4.5-inch angle grinders equipped with a 5/8-11 spindle thread. Part of the 3M 967A series.

Installation Notes

Installation is performed by grinding equipment operators and metal fabrication tradespeople. Always power down and unplug or lock out the angle grinder before mounting or removing a flap disc. Verify the tool's no-load RPM rating does not exceed the disc's 13,300 RPM maximum before use. Inspect the disc for damage before each use and never use a disc that shows cracking, torn flaps, or a damaged backing plate.