Norton 66623399008 Flap Disc 40 Grit 5 Inch Type 27

Product Description

The NORTON 66623399008 is a Type 27 ceramic alumina flap disc engineered for aggressive material removal on steel and stainless steel surfaces. Measuring 5 inches in diameter with a 7/8 inch arbor hole, this coarse-grit (40 grit) disc mounts to standard angle grinders and operates at a maximum of 12,000 RPM. The polyester-backed, trimmable flap construction allows the disc to conform slightly to contoured surfaces while maintaining consistent cut rate. It is suited for weld grinding, surface blending, and stock removal tasks where a coated abrasive disc is the preferred tool. This disc is sold individually but is available in minimum order quantities of 10 units.

This flap disc is intended for use in metal fabrication, structural steel work, and maintenance welding environments. The zirconia alumina abrasive material delivers durable cutting performance across both mild steel and stainless steel workpieces. The Type 27 flat profile is appropriate for flat surface work and shallow-angle grinding. The R828 series designation identifies this disc within the NORTON coated abrasive product line. Metalworkers, welders, and fabricators working in industrial and commercial settings are the primary installers of this product.

Key Features

• Type 27 flat profile for flat surface grinding and stock removal
• 40 grit coarse grade for aggressive material removal and weld grinding
• Zirconia alumina abrasive for durable performance on steel and stainless steel
• Trimmable flap design allows disc dressing to expose fresh abrasive
• 7/8 inch arbor hole fits standard angle grinder spindles
• Maximum operating speed of 12,000 RPM

Compatibility

Designed for use on steel and stainless steel. Fits angle grinders with a 7/8 inch arbor and a maximum spindle speed at or above 12,000 RPM. Verify grinder RPM rating before mounting.

Installation Notes

This disc is installed and used by metalworkers, welders, and fabricators operating angle grinders. Always confirm the grinder's rated RPM does not exceed the disc maximum of 12,000 RPM before mounting. Inspect the disc for damage before each use and replace immediately if cracks or excessive wear are present. Follow applicable ANSI B7.1 and OSHA standards for abrasive wheel safety, including use of proper eye and face protection.