Norton 66623399149 Flap Disc 40 Grit Type 27 5 Inch

Product Description

The NORTON 66623399149 is a Type 27 flap disc designed for aggressive material removal on metal, weld grinding, and surface blending applications. Built with zirconia alumina abrasive on a cloth backing, it delivers a coarse 40-grit cut that holds up under sustained pressure. The disc measures 5 inches in diameter with a 7/8 inch arbor hole and is rated to 12,000 RPM. The trimmable flaps allow the operator to expose fresh abrasive as the disc wears, extending usable life. Licensed tradespeople and metalworkers in fabrication, maintenance, and construction rely on this disc for fast stock removal without disc swaps.

This flap disc suits angle grinder use across residential and commercial metalworking tasks, including weld blending, deburring, and surface preparation on mild steel, stainless steel, and cast iron. The Type 27 flat-profile design positions the abrasive surface parallel to the workpiece, making it well-suited for flat and contoured surface work. It is sold individually and requires a minimum order of 10 units per purchase.

Key Features

• Zirconia alumina abrasive delivers fast, consistent stock removal on metal surfaces
• Type 27 flat-profile geometry optimized for flat and contoured grinding work
• Cloth backing provides durability and flexibility under load
• Trimmable flaps expose fresh abrasive as the disc wears, extending disc life
• Rated to 12,000 RPM for compatibility with standard angle grinders
• Coarse 40-grit designation for aggressive material removal and weld grinding

Compatibility

Designed for use on standard 5 inch angle grinders accepting a 7/8 inch arbor attachment. Suitable as an OEM-style replacement flap disc for grinding and blending operations on compatible angle grinder models.

Installation Notes

Installation is performed by qualified metalworkers or tradespeople familiar with angle grinder safety practices. Always power down and unplug the grinder before mounting or removing the disc. Verify that the grinder free-speed RPM rating meets or exceeds the disc maximum RPM of 12,000 before operation. Wear appropriate personal protective equipment including eye protection and gloves during disc changes and grinding operations.