Merit Abrasives 69957399680 Quick-change Disc 3/4 in 320 Grit

Product Description

The MERIT ABRASIVES 69957399680 is a coated quick-change abrasive disc designed for use with Power-Lock Type R attachment systems. The disc measures 3/4 inch in diameter and cuts with 320-grit aluminum oxide abrasive, placing it in the extra-fine grade range. Backed by rigid polyester with a Y-weight backing, it is built to hold its shape under high-speed rotation up to 40,000 RPM. The brown disc with black button is part of the R766 series. It is suited for fine finishing, light deburring, and surface prep work on metal and similar materials. Machinists, fabricators, and general metalworkers are the typical users.

This disc is used in applications requiring consistent fine finishing at high rotational speeds. The Type R quick-change attachment makes swapping discs fast without tools, which is common in production grinding and finishing setups. At 3/4 inch diameter, it fits into tight areas and contoured surfaces where larger discs cannot reach. It is well-suited for use on angle grinders, die grinders, and rotary tools configured for Type R quick-change disc systems. Minimum order quantity is 100 units, with individual package quantity of 1 disc per pack.

Key Features

• 320 grit aluminum oxide abrasive for extra-fine surface finishing
• Type R Power-Lock quick-change attachment for tool-free disc swaps
• Rated to 40,000 RPM for high-speed rotary tool use
• Rigid polyester Y-weight backing for consistent disc geometry
• 3/4 inch diameter fits tight or contoured workspaces
• Part of the R766 series coated abrasive line

Compatibility

Designed for use with Type R Power-Lock quick-change disc holders and mandrels on angle grinders, die grinders, and rotary tools rated at or above 40,000 RPM maximum speed.

Installation Notes

Installation is performed by pressing the disc onto a compatible Type R quick-change mandrel until it locks into place. Before mounting or removing the disc, ensure the rotary tool is powered off and unplugged or has its power source disconnected. Always verify the tool's rated RPM meets or exceeds the disc's 40,000 RPM maximum before operation. Wear appropriate eye and hand protection when operating abrasive discs.