Norton 66254419991 Flap Disc 36 Grit Type 29 4.5 Inch

Product Description

The NORTON 66254419991 is a Type 29 zirconia alumina flap disc designed for aggressive material removal on metal and fabrication surfaces. The disc measures 4.5 inches in diameter with a 5/8-11 arbor hole and runs at a maximum of 13,300 RPM. At 36 grit, it falls in the very coarse grade range, making it suited for weld blending, heavy stock removal, and surface prep work where fast cut rate matters more than finish. The fiberglass backing provides rigidity and support across the full range of the flap stack, maintaining disc integrity under load.

This flap disc is used in metal fabrication, structural steel work, and general industrial grinding applications. The Type 29 conical design allows the disc to contact the workpiece at an angle, which increases surface contact and cut aggressiveness compared to a flat Type 27 disc. It is typically used with a 4.5-inch angle grinder. The 36-grit abrasive cuts fast on carbon steel, stainless steel, and cast iron, making it a common choice for prep work before welding or coating. Fabricators, ironworkers, and industrial maintenance technicians are the primary users.

Key Features

• Type 29 conical design increases grinding contact angle for aggressive stock removal
• 36 grit zirconia alumina abrasive delivers very coarse, fast-cutting performance
• Fiberglass backing provides structural support and resists flex under pressure
• 5/8-11 arbor attachment fits standard 4.5-inch angle grinders
• Rated to 13,300 RPM maximum operating speed
• Blue disc color for quick visual identification on the job

Compatibility

Designed as an OEM-style replacement flap disc for use with standard 4.5-inch angle grinders equipped with a 5/8-11 arbor spindle.

Installation Notes

Installation and use of grinding discs should be performed by qualified personnel following ANSI B7.1 and applicable safety standards. Verify the grinder spindle speed does not exceed the 13,300 RPM disc rating before mounting. Inspect the disc for damage before each use and do not use a disc that shows cracking, delamination, or missing flaps. Always fit the proper guard to the angle grinder before operation.