Norton 66261121290 Flap Disc 4.5 in 36 Grit Type 29 Zirconia

Product Description

The NORTON 66261121290 is a Type 29 zirconia alumina flap disc engineered for aggressive material removal on metal surfaces. At 4.5 inches in diameter with a 5/8-11 threaded arbor hole, it mounts directly to standard angle grinders without additional hardware. The 36-grit, very coarse abrasive rating makes it suited for heavy stock removal, weld blending, and surface conditioning. A fiberglass backing plate provides rigid support through the full life of the disc, maintaining consistent contact angle under load. Rated to 13,000 RPM, it meets the demands of sustained grinding in fabrication and maintenance environments. Licensed fabricators, ironworkers, and metalworking professionals are the primary users of this disc.

This flap disc is designed for use on steels, stainless steel, and titanium. The Type 29 conical geometry presents the abrasive at an angle to the workpiece, concentrating cutting action and improving stock removal rates compared to flat Type 27 discs. It is well-suited for flat surface grinding, edge work, and weld seam blending in both shop and field settings. The X-weight fiberglass backing resists flex and heat buildup during extended passes, making it a practical choice for structural steel prep, pipe fabrication, and sheet metal work where consistent cut rate matters.

Key Features

• Type 29 conical geometry for aggressive contact angle and high stock removal
• 36 grit, very coarse zirconia alumina abrasive for fast cutting on metal
• Fiberglass X-weight backing for rigidity and heat resistance under load
• 5/8-11 threaded arbor hole for direct mount on standard angle grinders
• 13,000 RPM maximum speed rating
• Compatible with steels, stainless steel, and titanium workpieces

Compatibility

Designed for use on steels, stainless steel, and titanium. Fits angle grinders with a 5/8-11 threaded spindle. Part of the NORTON R822 series of coated abrasive flap discs.

Installation Notes

Install on a compatible angle grinder with a 5/8-11 threaded spindle, ensuring the disc is fully seated and the guard is in place before powering the tool. Verify the tool's no-load RPM does not exceed the 13,000 RPM disc rating before operation. Inspect the disc for damage before each use and discard any disc that shows cracking, separation, or delamination. Always wear appropriate eye protection and follow applicable ANSI B7.1 and tool manufacturer safety guidelines when using grinding discs.