Norton 66623341108 Flap Disc 60 Grit Type 29 4.5 Inches

Product Description

The NORTON 66623341108 is a Type 29 zirconia alumina flap disc engineered for aggressive grinding and blending on metal surfaces. Part of the R860 series, this 4.5-inch disc runs at a maximum of 13,300 RPM and carries a medium 60-grit abrasive for fast stock removal with a consistent finish. The Type 29 conical geometry places the abrasive at an angle to the workpiece, improving contact on flat and contoured surfaces. A fiberglass backing provides structural rigidity under load while keeping weight low. The 7/8-inch arbor hole fits standard angle grinder spindles. This disc is used by metal fabricators, welders, pipefitters, and maintenance technicians who need a reliable workhorse abrasive for everyday steel grinding tasks.

The 66623341108 is suited for grinding, blending, and deburring on steels in both shop and field environments. The zirconia alumina grain self-sharpens as it wears, maintaining cut rate over the disc life without frequent tool changes. At 60 grit, it removes weld spatter, scale, and surface defects efficiently while still leaving a workable surface profile. It is an appropriate choice for light structural work, pipe prep, and general fabrication cleanup where a single disc needs to handle both grinding and finishing in one pass.

Key Features

• Type 29 conical flap design for improved surface contact on flat and contoured workpieces
• Zirconia alumina grain self-sharpens during use for sustained cut rate on steels
• 60 grit medium grade balances aggressive stock removal with surface finish quality
• Fiberglass backing delivers rigidity and stability at high RPM
• 7/8-inch arbor hole fits standard angle grinder spindles without an adapter
• Rated to 13,300 RPM maximum for use on common 4.5-inch angle grinders

Compatibility

Designed for use on steels with standard 4.5-inch angle grinders equipped with a 7/8-inch arbor. Verify that the grinder's no-load RPM does not exceed the 13,300 RPM disc rating before use.

Installation Notes

Mounting and operation should follow ANSI B7.1 and the grinder manufacturer's safety guidelines. Inspect the disc for damage before each use and never operate above the rated maximum RPM. Secure the arbor nut with the appropriate spanner wrench to the grinder manufacturer's specification. Always use the guard supplied with the grinder and wear appropriate PPE including a face shield, gloves, and hearing protection.