Norton 66623341109 Flap Disc 80 Grit Type 29 4.5 Inches

Product Description

The NORTON 66623341109 is a Type 29 zirconia alumina flap disc designed for aggressive material removal on steel and ferrous metals. At 80 grit, it falls in the medium grade range, making it well suited for blending welds, removing scale, and cleaning up surface imperfections. The fiberglass backing provides rigid support under load, and the conical Type 29 geometry increases surface contact on flat and contoured workpieces. Rated at 13,300 RPM, this disc is compatible with standard 4.5-inch angle grinders fitted with a 7/8 inch arbor. It is part of the NORTON R860 series.

This flap disc is used in fabrication shops, structural steel work, and maintenance environments where consistent stock removal on steel is required. The zirconia alumina abrasive grain self-sharpens during use, extending disc life compared to aluminum oxide options. Typical applications include weld blending, deburring, and surface preparation before coating or inspection. The Type 29 profile suits work on flat surfaces as well as slightly contoured areas. This is a single-disc unit sold in minimum quantities of 10.

Key Features

• Type 29 conical geometry increases contact area on flat and contoured surfaces
• Zirconia alumina abrasive grain self-sharpens for extended disc life on steel
• 80 grit medium grade suited for weld blending, scale removal, and surface prep
• Fiberglass backing provides rigid support and durability under grinding load
• 13,300 RPM maximum speed rating compatible with standard 4.5 inch angle grinders
• 7/8 inch arbor hole fits most common angle grinder spindles

Compatibility

Designed for use on steels. Fits 4.5 inch angle grinders with a 7/8 inch arbor hole attachment.

Installation Notes

Installation is performed by grinding professionals or metalworkers using a 4.5 inch angle grinder. Always verify the grinder's rated RPM meets or exceeds the disc's 13,300 RPM rating before mounting. Power down and disconnect the grinder before changing discs, and confirm the arbor nut is fully secured before operation. Wear appropriate PPE including a face shield, and inspect the disc for damage before each use.