3M 7100104917 Flap Disc 80 Grit 4 Inch Ceramic Type 29

Product Description

The 3M 7100104917 is a 4-inch Type 29 ceramic flap disc designed for use with angle grinders in metal grinding, blending, and finishing applications. It features an 80-grit ceramic abrasive on a polyester backing, giving it consistent cut rate and durability across ferrous and non-ferrous metals. The conical Type 29 profile presents the abrasive at an angle that favors aggressive material removal on flat and contoured surfaces. With a maximum rated speed of 15,000 RPM and a 3/8-24 threaded arbor attachment, it mounts directly to compatible angle grinders without a separate backing pad. This disc is used by fabricators, ironworkers, and maintenance tradespeople working on structural steel, weld seams, and pipe.

This disc fits applications requiring medium-grade stock removal with a controlled finish. The 4-inch diameter suits smaller angle grinders commonly used in tight spaces and detail work on fabricated assemblies, welds, and pipe joints. The 3/8-24 threaded hole provides a direct arbor mount, making tool changes fast in production or field settings. It is appropriate for both shop fabrication and on-site mechanical, structural, and industrial maintenance work where a consistent abrasive is needed across multiple passes.

Key Features

• Ceramic abrasive for consistent cut rate and longer disc life compared to aluminum oxide
• Type 29 conical profile for aggressive grinding on flat and contoured surfaces
• 80 grit medium grade balances material removal speed with surface finish
• Polyester backing for durability and flexibility under load
• 3/8-24 threaded arbor attachment for direct mount to compatible angle grinders
• 15,000 RPM maximum rated speed

Compatibility

Designed as an OEM-style replacement flap disc for 4-inch angle grinders accepting a 3/8-24 threaded arbor attachment. Always verify that the grinder's rated speed does not exceed the disc's 15,000 RPM maximum before use.

Installation Notes

Installation should be performed by qualified tradespeople familiar with angle grinder safety. Confirm the grinder is disconnected from power before mounting or removing the disc. Thread the disc fully onto the 3/8-24 arbor and verify it is seated securely before operation. Always inspect the disc for visible damage before use and never operate above the rated 15,000 RPM maximum.