Norton 66623399006 Flap Disc 80 Grit Ceramic Alumina Type 27

Product Description

The NORTON 66623399006 is a Type 27 ceramic alumina flap disc engineered for aggressive material removal on angle grinders. Running at a maximum of 13,300 RPM, this 4.5-inch disc with a 7/8-inch arbor hole delivers consistent, medium-grit (80) cutting action across ferrous and non-ferrous workpieces. The ceramic alumina abrasive grain self-sharpens under pressure, maintaining cut rate longer than conventional aluminum oxide. A polyester backing resists heat and flex, supporting the flap structure through heavy grinding passes. Designed for professionals who need reliable stock removal in welding prep, fabrication, and surface conditioning work.

This disc suits metal fabrication shops, structural steel work, and maintenance welding environments where fast, controlled stock removal is required. The Type 27 flat-face profile is optimized for flat surface grinding and blending at low angles of attack, making it a practical choice for weld seam grinding, deburring, and surface prep on plate, pipe, and structural shapes. The trimmable design allows the operator to expose fresh abrasive material as the disc wears, extending usable disc life during extended grinding sessions.

Key Features

• Ceramic alumina abrasive grain self-sharpens for sustained cut rate throughout disc life
• Type 27 flat-face profile optimized for flat surface grinding and low-angle blending
• Polyester backing provides heat resistance and structural support under load
• Trimmable construction allows fresh abrasive exposure as disc wears
• 80 grit medium grade balances stock removal speed with surface finish quality
• 13,300 RPM maximum speed rated for standard 4.5-inch angle grinder operation

Compatibility

Designed for use on angle grinders accepting a 4.5-inch Type 27 flap disc with a 7/8-inch arbor hole attachment.

Installation Notes

Installation and disc changes must be performed by qualified personnel with the grinder disconnected from its power source. Verify that the grinder's rated no-load RPM does not exceed the disc's 13,300 RPM maximum before mounting. Inspect the disc for cracks or damage before each use and discard any disc that shows signs of delamination or impact damage. Always use the appropriate guard for the disc type and follow ANSI B7.1 safety requirements for abrasive wheel use.