Norton 666233-57289 Aluminum Oxide Fiber Disc 120 Grit

Product Description

The NORTON 666233-57289 is an aluminum oxide fiber disc designed for aggressive material removal on metal, welds, and other hard surfaces. Sold in a pack of 25, this disc measures 7 inches in diameter with a 7/8-inch arbor hole and carries a 120-grit rating, placing it in the medium-fine range for controlled stock removal and surface blending. Aluminum oxide abrasive is well-suited to ferrous metals and general fabrication work, offering consistent cut rate and durability under sustained pressure. This disc is part of the Merit FX370 product line.

These fiber discs are used across metalworking, fabrication, and maintenance applications where a backing plate and angle grinder are the standard setup. The 7-inch diameter makes them appropriate for larger-format grinders used in structural steel work, pipe fabrication, weld blending, and surface conditioning on flat or moderately contoured workpieces. At 120 grit, they are suited for finish grinding and light deburring after heavier stock removal has been completed with a coarser disc.

Key Features

• Aluminum oxide abrasive grain for consistent cut on ferrous metals and general fabrication surfaces
• 120-grit rating for medium-fine material removal, deburring, and weld blending
• 7-inch diameter with 7/8-inch arbor hole for compatibility with standard large-format angle grinders
• Fiber backing provides rigidity and support when used with a firm backing pad
• Packaged in quantities of 25 discs per order unit

Compatibility

Designed for use with 7-inch angle grinders fitted with a compatible rigid or semi-flexible fiber disc backing pad. Requires a backing pad with a 7/8-inch arbor to match the disc center hole.

Installation Notes

Fiber discs must be used with a properly matched backing pad rated for the disc diameter and grinder RPM. Verify that the grinder's maximum RPM rating meets or exceeds the disc rating before mounting. Always power down and disconnect the grinder from its power source before changing discs. Inspect each disc for cracks or damage before use and never operate a damaged disc.

Technical Specifications

• Abrasive Material: Aluminum Oxide
• Product Line: Merit FX370
• Disc Diameter: 7 inches
• Arbor Hole Size: 7/8 inches
• Grit: 120
• Package Quantity: 25 discs
• Unit of Measure: Each

Standard Information

• Brand: NORTON
• Manufacturer Part Number: 666233-57289