Merit Abrasives 69957399612 Quick-change Disc 320 Grit

Product Description

The MERIT ABRASIVES 69957399612 is a quick-change coated abrasive disc designed for use with Power-Lock Type S attachment systems. At 3/4 inch in diameter and rated 320 grit extra fine, this disc is built for precision finishing, light deburring, and surface prep on metal and composite materials. The aluminum oxide abrasive grain is bonded to a rigid polyester backing with a Y-weight designation, providing consistent cut and durability at speeds up to 40,000 RPM. It is sold individually but requires a minimum order quantity of 100 units, making it well-suited for shop and production environments.

This disc fits into metal fabrication, automotive bodywork, aerospace finishing, and general industrial surface conditioning workflows. The 3/4 inch form factor is suited for tight-radius work and detail finishing where a larger disc cannot access. The extra fine 320 grit makes it appropriate for final-pass smoothing before coating, plating, or inspection. Licensed metal fabricators, machinists, and industrial maintenance technicians are the primary users. The rigid backing ensures dimensional stability during high-speed operation, reducing disc flex that could compromise finish quality.

Key Features

• 320 grit extra fine aluminum oxide grain for precision surface finishing
• Power-Lock Type S quick-change attachment for fast disc swaps without tools
• Rigid polyester Y-weight backing maintains disc shape at operating speed
• Rated to 40,000 RPM for compatibility with high-speed rotary tools and die grinders
• 3/4 inch diameter designed for detail work and confined-area finishing
• Part of the Merit R766 series for consistent grain distribution and cut rate

Compatibility

Designed for use with Power-Lock Type S quick-change mandrels and compatible rotary tools rated for small-diameter coated abrasive discs up to 40,000 RPM.

Installation Notes

This disc is installed by a metalworker or machinist using a compatible Type S quick-change mandrel mounted in a die grinder or similar rotary tool. Confirm the tool spindle speed does not exceed the 40,000 RPM rating before operation. Inspect the disc for damage before each use and do not use discs that show fraying, delamination, or core cracks. Always wear appropriate eye and face protection when operating abrasive discs at high speed.