Merit Abrasives 69957399603 Quick-change Disc 40 Grit

Product Description

The MERIT ABRASIVES 69957399603 is a coated quick-change abrasive disc designed for use with Power-Lock Type S attachment systems. Measuring 3/4 inches in diameter, this disc features 40-grit aluminum oxide abrasive on a rigid polyester backing rated for up to 40,000 RPM. The coarse grit and aluminum oxide mineral make it well suited for aggressive material removal on metal, welds, and surface prep work. The R766 series construction uses a Y-weight polyester backing for durability under high-speed rotation. Each package contains one disc, and this item is sold in multiples of 100.

This disc is intended for use in fabrication, maintenance, and repair applications where rapid stock removal is required. The 3/4-inch diameter fits compact quick-change mandrels used with die grinders and inline pneumatic or electric tools. It is commonly used by metalworkers, pipefitters, and maintenance technicians for deburring, weld blending, and surface conditioning in tight or contoured areas. The Type S Power-Lock attachment provides a secure, tool-free disc change under production conditions.

Key Features

• 40-grit aluminum oxide abrasive for aggressive coarse-grade material removal
• Rigid Y-weight polyester backing resists flex during high-speed grinding
• Rated to 40,000 RPM for use with standard die grinder speeds
• Type S Power-Lock attachment system for quick, tool-free disc changes
• 3/4-inch diameter fits compact mandrels in confined work areas
• R766 series construction for consistent cut and extended service life

Compatibility

Designed for use with Type S Power-Lock quick-change mandrels compatible with the R766 series 3/4-inch coated abrasive disc format.

Installation Notes

Installation of quick-change abrasive discs is performed by metalworking and maintenance trades using die grinders or similar rotary tools. Before mounting or changing the disc, power down the tool and disconnect it from the air supply or electrical source. Verify that the mandrel type matches the Type S attachment system and that the tool RPM rating does not exceed 40,000 RPM. Always wear appropriate eye and face protection when operating abrasive discs at high speed.