Norton 66623399191 Flap Disc 60 Grit Type 29 5 Inch

Product Description

The NORTON 66623399191 is a Type 29 zirconia alumina flap disc designed for aggressive material removal on angle grinders. It runs at a maximum speed of 12,000 RPM and carries a 60 grit, medium grade abrasive surface suited for blending, grinding, and finishing on metal and weld seams. The fiberglass backing plate provides rigidity and durability under heavy load. At 5 inches in diameter with a 5/8-11 arbor attachment, it fits the most common angle grinder spindle size used in fabrication and metalworking trades. Weighing 0.43 pounds, the disc is lightweight without sacrificing abrasive performance.

This flap disc is used in metal fabrication shops, structural steel work, welding cleanup, and general grinding applications. The Type 29 conical design positions the abrasive at an angle to the workpiece, making it effective for stock removal on flat and contoured surfaces. It is commonly installed and used by welders, pipefitters, ironworkers, and maintenance mechanics who require consistent cut rate and surface finish in a single disc. The blue fiberglass-backed construction is typical for production grinding environments where disc life and heat resistance matter.

Key Features

• Type 29 conical flap design for aggressive stock removal and surface blending
• Zirconia alumina abrasive material delivers long service life on steel and alloys
• 60 grit medium grade balances cut rate with surface finish quality
• Fiberglass backing plate resists flex and heat during extended use
• 5/8-11 arbor attachment fits standard angle grinder spindles
• Rated to 12,000 RPM maximum operating speed

Compatibility

Designed for use on standard 5 inch angle grinders equipped with a 5/8-11 threaded spindle. Suitable for grinding and finishing carbon steel, stainless steel, and similar hard metals.

Installation Notes

Installation is performed by threading the 5/8-11 arbor disc directly onto the angle grinder spindle and securing with the appropriate flange and locking nut. Always verify the grinder free speed does not exceed the 12,000 RPM disc rating before use. Inspect the disc for cracks or delamination before each use and discard if damaged. Use appropriate PPE including face shield, gloves, and hearing protection per ANSI B11 and OSHA grinding safety requirements.