Merit Abrasives 69957399627 Quick-change Disc 40 Grit

Product Description

The MERIT ABRASIVES 69957399627 is a coated quick-change abrasive disc designed for use with Power-Lock Type S attachment systems on handheld disc sanders. At 1-1/2 inches in diameter and 40 grit, it falls in the extra-coarse grade range, making it suited for aggressive material removal, deburring, and surface preparation. The disc uses aluminum oxide abrasive bonded to a rigid, Y-weight, 2-ply cloth and polyester backing. This construction supports high-speed operation up to 30,000 RPM. Metalworkers, fabricators, and finishing technicians use this disc for fast stock removal on a range of ferrous and non-ferrous metals.

This disc is rated for use on 300 and 400 series stainless steel, aluminum, brass, bronze, hard carbon steels, soft carbon steels, and titanium. It is part of the Merit R766 series, which is built around an X-weight backing for durability under repeated flex and pressure. Typical applications include weld seam cleanup, edge deburring, light blending, and surface conditioning work in fabrication shops, maintenance environments, and light industrial settings. The silver button color indicates the Type S quick-change mount, which locks and releases without tools.

Key Features

• 40 grit aluminum oxide abrasive for aggressive, extra-coarse material removal
• Power-Lock Type S quick-change attachment for tool-free disc swaps
• Rigid Y-weight cloth and polyester backing resists tearing under load
• Rated to 30,000 RPM for use with standard handheld disc sanders
• Compatible with multiple metal types including stainless steel, aluminum, brass, bronze, and carbon steels
• Part of the R766 series with 2-ply cotton backing construction

Compatibility

Designed for use with handheld disc sanders equipped with a Power-Lock Type S quick-change spindle. Rated for material removal on 300 series stainless, 400 series stainless, aluminum, brass, bronze, hard carbon steels, soft carbon steels, and titanium.

Installation Notes

Metalworkers and fabricators install this disc by pressing it onto a Type S quick-change spindle until the locking mechanism engages. Always verify the tool spindle speed does not exceed the 30,000 RPM disc rating before operation. Wear appropriate PPE including eye protection and gloves when operating abrasive discs at high speed. Inspect the disc for damage before each use and discard any disc that shows cracking, tearing, or delamination.