Norton 77696097547 Flap Disc 4.5in Type 27 Aluminum Oxide

Product Description

The NORTON 77696097547 is a Type 27 non-woven flap disc designed for surface conditioning, light deburring, and finishing work on metal and similar substrates. At 4.5 inches in diameter with a 5/8-11 arbor hole, it mounts directly to standard angle grinders. The disc uses aluminum oxide abrasive in a very fine grade, making it suited for finishing passes rather than aggressive stock removal. A fiberglass backing plate supports the flap construction and maintains disc geometry under load. Rated to 133,000 RPM, it exceeds the operating speed of most 4.5-inch angle grinders by a wide margin, keeping it within safe working limits during sustained use.

This flap disc is used in metal fabrication shops, welding operations, and general maintenance environments where a controlled, fine finish is needed after heavier grinding steps have been completed. The Type 27 flat profile keeps the disc parallel to the work surface, making it well suited for flat stock, weld spatter cleanup, and blending on sheet metal or structural steel. It is typically installed and used by welders, fabricators, maintenance mechanics, and industrial tradespeople working with standard right-angle grinders.

Key Features

• Type 27 flat profile for flush surface contact and consistent finish
• Aluminum oxide non-woven abrasive in very fine grade for finishing and light conditioning
• Fiberglass backing plate for dimensional stability under load
• 5/8-11 arbor hole fits standard angle grinder spindles directly
• 133,000 RPM maximum speed rating provides a wide safety margin on 4.5-inch grinders
• Blue disc color for quick identification during tool changes

Compatibility

Designed as a direct-mount replacement for standard 4.5-inch Type 27 flap discs used with 5/8-11 threaded angle grinders. No backing flange or adapter required for most grinder spindles with this thread pattern.

Installation Notes

This disc is installed by licensed tradespeople and experienced operators using standard angle grinders. Always power down and disconnect the grinder from its power source before mounting or removing a disc. Confirm the grinder nameplate RPM rating does not exceed the disc maximum RPM before use. Wear appropriate PPE including eye protection and gloves, and inspect the disc for damage before each use.