Norton 66623399007 Ceramic Alumina Flap Disc 120 Grit

Product Description

The NORTON 66623399007 is a Type 27 ceramic alumina flap disc engineered for aggressive grinding and finishing on metal, stainless steel, and hard alloys. Built on a polyester backing, it runs at a rated maximum of 13,300 RPM and delivers fine-grade surface finishing in a single pass. The 7/8-inch arbor-mount center hole fits standard right-angle grinders. Ceramic alumina abrasive cuts cooler and lasts longer than conventional aluminum oxide, reducing disc changes on heavy production work. The trimmable design allows the operator to expose fresh abrasive as the disc wears, extending usable life on contoured or uneven surfaces.

This disc is suited to fabrication shops, maintenance and repair operations, and field welding applications where operators need consistent stock removal alongside a controlled surface finish. At 4.5 inches in diameter with a fine 120 grit, it is well matched to deburring weld seams, blending surface transitions, and preparing metal for coating or inspection. The green polyester-backed construction handles heat and flex better than fiberglass-backed alternatives during prolonged contact grinding.

Key Features

• Ceramic alumina abrasive for cool cutting and extended disc life
• Type 27 flat profile for surface grinding and blending applications
• 120 grit fine grade for finishing and pre-coat surface preparation
• Polyester backing provides flexibility and heat resistance during use
• Trimmable disc exposes fresh abrasive as the flaps wear down
• Rated to 13,300 RPM for use on standard 4.5-inch right-angle grinders

Compatibility

Designed for use on 4.5-inch right-angle grinders equipped with a 7/8-inch arbor attachment. Verify that the grinder free-speed rating does not exceed the 13,300 RPM disc maximum before mounting.

Installation Notes

Disc installation and replacement should be performed by trained personnel following the grinder manufacturer's guard and mounting requirements. Always confirm the grinder is unplugged or the battery removed before changing the disc. Inspect the disc for cracks, delamination, or damage before each use and discard any disc that shows signs of defect. ANSI B7.1 and applicable OSHA abrasive wheel standards govern safe use of bonded and coated abrasives in the workplace.