Norton 77696090084 Flap Disc 80 Grit 4.5 in Type 27

Product Description

The NORTON 77696090084 is a Type 27 zirconia alumina flap disc engineered for aggressive grinding and blending on steel and ferrous metals. Measuring 4.5 inches in diameter with a 7/8-inch arbor hole, it runs at a maximum of 13,300 RPM on a standard angle grinder. The disc features a fiberglass backing plate for rigidity and stability under load, and the high-density flap construction of the R860 series delivers consistent stock removal with a medium-coarse finish across the work surface. Fabricators, welders, and metal finishing techs reach for this disc when they need reliable cut rate on structural steel, weld seams, and plate work.

This flap disc is suited for light fabrication shops and heavy industrial settings alike. Its Type 27 flat-profile design sits flush against the workpiece, making it effective for flat surface grinding, weld blending, and edge work on steel plate and tube. The 80-grit zirconia alumina abrasive cuts fast and self-sharpens as it wears, reducing the need for frequent disc changes during extended runs. Metal fabricators and ironworkers will find this disc fits the common 4.5-inch angle grinder platforms used daily on structural and sheet metal applications.

Key Features

• Type 27 flat profile for flush surface grinding and weld blending
• 80-grit zirconia alumina abrasive for fast, self-sharpening stock removal
• Fiberglass backing provides rigidity and resistance to flex under load
• High-density R860 series flap construction for extended disc life
• Rated to 13,300 RPM for use on standard 4.5-inch angle grinders
• 7/8-inch arbor hole fits the most common angle grinder arbor size

Compatibility

Designed for use on 4.5-inch angle grinders with a 7/8-inch arbor, rated for steel and ferrous metal grinding applications at up to 13,300 RPM.

Installation Notes

Installation and disc changes should be performed by the grinder operator with the tool fully powered down and unplugged. Verify the grinder's rated RPM meets or exceeds the disc's 13,300 RPM maximum before mounting. Inspect the disc for cracks or damage before each use and never exceed the maximum rated speed. Personal protective equipment including a face shield and gloves is standard practice when operating angle grinders.