Norton 66254461178 Flap Disc 5 in 80 Grit Zirconia Alumina

Product Description

The NORTON 66254461178 is a Type 29 zirconia alumina flap disc designed for aggressive grinding and blending on metal surfaces. The conical Type 29 profile keeps the abrasive cloth at an angle that promotes consistent stock removal across flat and contoured workpieces. With an 80-grit medium grade, this disc handles weld blending, surface preparation, and deburring where a balance of cut rate and surface finish is required. Rated at 12,000 RPM maximum, it fits standard 5-inch angle grinders with a 7/8-inch arbor hole. Cloth backing provides flexibility and durability through demanding passes.

This disc is suited to metal fabrication, structural steel work, and maintenance grinding in industrial and commercial shop environments. Typical applications include removing mill scale, smoothing welds, and prepping surfaces before coating or inspection. It is used by ironworkers, pipefitters, sheet metal mechanics, and general fabricators. The zirconia alumina abrasive grain self-sharpens under pressure, extending disc life compared to standard aluminum oxide options in heavy-duty grinding tasks.

Key Features

• Type 29 conical flap design for aggressive material removal on flat and contoured surfaces
• Zirconia alumina abrasive grain self-sharpens under load for extended service life
• 80-grit medium grade balances cut rate with surface finish for weld blending and prep work
• Cloth backing adds flexibility and resistance to tearing during heavy grinding passes
• 12,000 RPM maximum speed rating for use with standard 5-inch angle grinders
• 7/8-inch arbor hole for direct mounting to common grinder spindles

Compatibility

Designed as an OEM-style replacement flap disc for 5-inch angle grinders equipped with a 7/8-inch arbor attachment.

Installation Notes

Installation is performed by grinding equipment operators and metal fabrication professionals. Confirm the grinder is powered off and unplugged before mounting or removing any abrasive disc. Verify the tool's rated RPM meets or exceeds 12,000 RPM before use, and inspect the disc for damage before each application. Follow ANSI B7.1 and applicable OSHA standards for abrasive wheel mounting, guarding, and personal protective equipment requirements.