3M 7100077039 Quick-change Disc 2 in 40 Grit Ceramic Type R

Product Description

The 3M 7100077039 is a quick-change abrasive disc designed for aggressive material removal on metal and other hard surfaces. Part of the 3M 947A Series, it features a ceramic abrasive grain on a polyester cloth backing rated X-weight for durability under high-stress grinding applications. The disc measures 2 inches in diameter, runs at a maximum of 25,000 RPM, and cuts at 40 grit in the coarse grade range. It attaches via a Type R quick-change system, allowing fast disc swaps without tools. Licensed tradespeople and maintenance machinists use this disc on angle grinders and die grinders for weld blending, surface prep, and edge work.

This disc is suited for use in fabrication shops, maintenance facilities, and industrial worksites where fast material removal on steel, stainless steel, and other metals is required. The ceramic abrasive grain delivers consistent cut rates and extended disc life compared to aluminum oxide alternatives. The Type R attachment system is compatible with standard quick-change mandrels found across common grinder platforms. Single-disc packaging makes it practical for restocking specific grit stages in a grinding sequence.

Key Features

• 40 grit coarse ceramic abrasive for aggressive stock removal
• 2-inch diameter fits standard quick-change mandrels
• Type R attaching system enables tool-free disc changes
• X-weight polyester cloth backing withstands high grinding pressure
• Rated to 25,000 RPM maximum operating speed
• 947A Series construction for consistent cut and long disc life

Compatibility

Designed for use with Type R quick-change mandrels on angle grinders and die grinders that accept 2-inch quick-change discs.

Installation Notes

This disc is installed and serviced by metalworkers, fabricators, and maintenance technicians. Before mounting, confirm the grinder spindle speed does not exceed the disc maximum of 25,000 RPM. Inspect the disc for damage before each use and discard any disc that shows cracks, tears, or delamination. Always use appropriate PPE including face shield, gloves, and hearing protection when operating abrasive discs.