3M 7100050302 Quick-change Disc 3 Inch 80 Grit Ceramic

Product Description

The 3M 7100050302 is a coated abrasive quick-change disc engineered for aggressive material removal on metal, weld seams, and surface prep applications. Part of the 3M 987C Series, it measures 3 inches in diameter and runs an 80-grit ceramic abrasive bonded with a resinoid bond to a fiber backing. The ceramic abrasive grain is self-sharpening under load, which helps maintain consistent cut rate and extends disc life compared to aluminum oxide alternatives. Rated to 20,000 RPM, this disc handles high-speed angle grinders and inline die grinders. The TR quick-change attachment allows single-handed disc swaps without extra tools.

This disc is suited for metal fabrication, automotive bodywork, and maintenance welding environments where frequent grit changes and fast stock removal are required. The medium-grade, 80-grit cut makes it appropriate for blending welds, removing rust, deburring heavy castings, and prepping surfaces before priming or finishing. The orange fiber-backed construction resists tearing under side load, making it a reliable choice for production grinding tasks where disc failures cause downtime.

Key Features

• Ceramic abrasive grain with self-sharpening characteristics for sustained cut rate
• 80 grit medium grade for aggressive stock removal and weld blending
• TR quick-change attachment for fast, tool-free disc changes
• 20,000 RPM maximum speed rating for high-speed grinders
• Resinoid bond with fiber backing resists tearing under load
• 3M 987C Series construction for consistent performance across the disc life

Compatibility

Designed for use with TR quick-change disc holders and backup pads on angle grinders and die grinders that accept 3-inch TR-style quick-change discs.

Installation Notes

Installation is performed by metalworking tradespeople and fabricators using a compatible TR backup pad and mandrel. Confirm the grinder spindle speed does not exceed the 20,000 RPM disc rating before mounting. Inspect the disc for cracks or damage before each use and never operate a damaged disc. Wear appropriate PPE including eye protection and gloves during installation and grinding operations.