Norton 66254427990 Fiber Disc 4.5in 36 Grit Ceramic Alumina

Product Description

The NORTON 66254427990 is a ceramic alumina fiber disc from the RazorStar series, designed for aggressive material removal on metal and other hard surfaces. Measuring 4.5 inches in diameter with a 7/8-inch center arbor hole, this coarse 36-grit disc mounts to standard right-angle grinders and disc sanders. The ceramic alumina abrasive delivers consistent cut rates and extended service life compared to conventional aluminum oxide discs. The fabric backing provides flexibility and durability under the high-load conditions typical in fabrication, weld preparation, and surface grinding work. Rated to 11,000 RPM, it suits most 4.5-inch grinder platforms used by metal fabricators, pipefitters, and industrial maintenance technicians.

This disc is suited for coarse stock removal, weld grinding, edge blending, and surface prep on ferrous and non-ferrous metals. The 36-grit rating makes it appropriate for initial passes where rapid material removal is the priority before stepping to finer grits. The RazorStar series is engineered for demanding applications where disc longevity and cut consistency reduce downtime. It is a coated abrasive product intended for professional trade and industrial use.

Key Features

• Ceramic alumina abrasive for high cut rate and extended disc life
• 36-grit coarse grade suited for aggressive stock removal and weld grinding
• 4.5-inch diameter with 7/8-inch arbor hole fits standard right-angle grinders
• Maximum operating speed of 11,000 RPM
• Fabric backing provides durability and flexibility under load
• RazorStar series coated abrasive construction

Compatibility

Designed for use with 4.5-inch right-angle grinders and disc sanders equipped with a 7/8-inch arbor. Verify that the tool RPM rating meets or exceeds the disc maximum of 11,000 RPM before mounting.

Installation Notes

Installation should be performed by qualified personnel following ANSI B7.1 and tool manufacturer guidelines. Always inspect the disc for cracks or damage before mounting and never exceed the 11,000 RPM maximum speed rating. Power down and disconnect the grinder from its power source before changing discs. Use the appropriate backing pad for fiber disc applications and ensure the arbor nut is properly tightened before operation.