Norton 66254400261 Flap Disc 120 Grit Ceramic Type 27

Product Description

The NORTON 66254400261 is a Type 27 ceramic flap disc designed for use with angle grinders in metalworking, fabrication, and surface conditioning applications. Built on a fiberglass backing plate, this disc runs at a flat grinding angle typical of Type 27 geometry, making it well suited for blending, finishing, and light material removal on flat and contoured surfaces. The abrasive flaps are constructed from ceramic grain rated at 120 grit, a fine grade that delivers consistent scratch patterns and controlled stock removal without aggressive cutting. At 0.25 pounds, the disc is lightweight and balanced for extended use. It mounts via a standard 5/8-11 arbor attachment, compatible with most 4.5-inch angle grinders.

This disc is intended for grinding and finishing operations on metal, stainless steel, and similar substrates in industrial, fabrication, and maintenance settings. The NORTON R980 series ceramic grain is engineered for self-sharpening behavior under heat and pressure, extending disc life compared to standard aluminum oxide flap discs. It is appropriate for both shop and field use by welders, fabricators, pipefitters, and maintenance mechanics who require a fine-grit finishing step after heavier material removal passes. The fiberglass backing provides rigidity and heat resistance during sustained grinding.

Key Features

• 120 grit fine-grade ceramic abrasive for controlled finishing and blending
• Type 27 flat profile for flush surface grinding and weld blending
• Fiberglass backing plate for rigidity and heat resistance
• 5/8-11 arbor attachment fits standard 4.5-inch angle grinders
• NORTON R980 series ceramic grain with self-sharpening characteristics
• Lightweight at 0.25 pounds for reduced operator fatigue

Compatibility

Designed as an OEM-style replacement flap disc for standard 4.5-inch angle grinders equipped with a 5/8-11 threaded arbor spindle.

Installation Notes

Flap discs of this type are installed and serviced by fabricators, welders, and maintenance mechanics using standard angle grinder tooling. Always power down and disconnect the grinder from its power source before mounting or removing the disc. Verify that the grinder's rated RPM meets or exceeds the disc's maximum operating speed before use, and inspect the disc for damage before each installation. Follow applicable ANSI B7.1 safety standards for abrasive wheel mounting and operation.