Norton 78072770329 Abrasive Belt 320 Grit 3x21 in Aluminum Oxide

Product Description

The NORTON 78072770329 is a coated abrasive belt designed for dry stock removal and surface finishing applications. Built on the R228 series, it uses aluminum oxide abrasive grain in a 320 extra fine grit rating, bonded to a heavyweight X-weight cloth backing with a closed coat density. The closed coat construction delivers consistent scratch patterns and minimal grain spacing, making it well suited for fine finishing passes on metal, wood, or composite surfaces. Licensed trades and skilled fabricators rely on this belt for precision work where surface quality matters as much as material removal rate.

This belt fits portable and stationary belt sanders configured for 3 inches by 21 inch belts. Typical applications include finish sanding of metal components, deburring weld seams, surface prep before coating or plating, and fine wood finishing. The dry-only rating means it is not intended for wet grinding or liquid coolant environments. The R228 series is a standard production belt for shops handling light to medium finishing volume.

Key Features

• 320 extra fine grit aluminum oxide abrasive for fine surface finishing
• Closed coat construction provides uniform scratch pattern and consistent finish
• Heavyweight X-weight cloth backing resists tearing and flexing under load
• Dry-only operation — rated for use without water or liquid coolant
• R228 series coated abrasive, sold individually

Compatibility

Designed as a direct-fit replacement belt for portable and stationary belt sanders accepting 3 inch by 21 inch abrasive belts in dry grinding and finishing applications.

Installation Notes

Installation is performed by machinists, fabricators, woodworkers, or maintenance technicians. Power down and unplug the sander before changing belts. Verify belt tracking adjustment after installation and run the machine briefly at no-load before applying workpiece contact. Do not use this belt in wet or coolant-fed applications.