Norton 66623399174 Flap Disc 120 Grit 4-1/2 in Type 29

Product Description

The NORTON 66623399174 is a Type 29 ceramic alumina flap disc designed for aggressive material removal and surface blending on metal workpieces. Built with a fine 120-grit ceramic alumina abrasive bonded to a polyester backing, this disc delivers consistent cut rates and extended service life under sustained use. The Type 29 conical profile allows for optimal grinding angles, making it well-suited for weld blending, edge work, and contour grinding. It is rated to a maximum of 13,300 RPM and fits standard 5/8-11 arbor angle grinders. Fabricators, pipefitters, and metal finishing tradespeople are the primary users of this disc type.

This disc is intended for use on angle grinders equipped with a 5/8-11 threaded spindle. The 4-1/2 inch diameter and Type 29 geometry make it a practical choice for weld removal, deburring, and surface conditioning on structural steel, pipe, and sheet metal in both shop and field environments. The fine 120-grit rating suits finish-pass work where scratch pattern and surface quality are a priority. The polyester backing provides flexibility and resistance to tearing during contour grinding applications.

Key Features

• Ceramic alumina abrasive for extended cutting life compared to conventional aluminum oxide
• Type 29 conical profile optimized for blending, weld removal, and contour work
• 120 grit fine grade for controlled material removal and improved surface finish
• Polyester backing resists tearing and flexes to follow contoured workpiece surfaces
• 5/8-11 arbor hole fits the most common angle grinder spindle thread
• 13,300 RPM maximum speed rating for use with standard 4-1/2 inch angle grinders

Compatibility

Designed for use with angle grinders accepting a 5/8-11 arbor attachment and a 4-1/2 inch disc diameter. Suitable for metal grinding and surface finishing applications where a Type 29 coated abrasive disc is specified.

Installation Notes

This disc is installed and serviced by metal fabricators, pipefitters, and general tradespeople using standard angle grinders. Always confirm the grinder spindle speed does not exceed the 13,300 RPM disc rating before mounting. Power down and disconnect the grinder from its power source before changing discs. Inspect the disc for cracks or damage before each use and do not use a damaged disc.