Dewalt DWA8280H Flap Disc 40 Grit Type 29 Ceramic 4.5 in

Product Description

The DEWALT DWA8280H is a Type 29 ceramic alumina flap disc designed for aggressive material removal on steel and stainless steel. The conical Type 29 geometry presents the abrasive at an angle, increasing contact area and cutting efficiency compared to flat Type 27 discs. At 40 grit, this disc falls in the coarse range, making it well suited for weld blending, heavy stock removal, and surface preparation. Cotton backing provides flexibility and support across the flap arrangement. The disc is rated to 8,700 RPM and mounts via a 5/8-11 threaded arbor hole for use on standard 4.5-inch angle grinders. Licensed HVAC, welding, and fabrication professionals keep this disc class on hand for everyday metalwork.

This disc is intended for use on carbon steels and stainless steel surfaces in both shop and field applications. The Type 29 profile is a common choice for flat-surface grinding and contour work, particularly when a blend between a grinding disc and a flap arrangement is needed. At 4.5 inches in diameter, it fits the most widely used class of angle grinders in fabrication, maintenance, and mechanical contracting environments. Typical applications include deburring weld seams, removing mill scale, and prepping metal surfaces before coating or inspection.

Key Features

• Ceramic alumina abrasive for fast, cool cutting and extended disc life on hard metals
• Type 29 conical geometry increases contact angle for aggressive stock removal and weld blending
• 40 grit coarse grade removes material quickly on steel and stainless steel
• Cotton backing adds flexibility for contouring while maintaining abrasive support
• 5/8-11 threaded arbor hole fits standard 4.5-inch angle grinders without adapters
• 8,700 RPM maximum speed rating for safe use on full-size angle grinders

Compatibility

Designed for use on standard 4.5-inch angle grinders with a 5/8-11 threaded spindle. Rated for material removal on steels and stainless steel.

Installation Notes

Installation is performed by threading the disc directly onto the grinder spindle and securing it hand-tight before confirming the guard is properly positioned. Always verify the grinder free-speed does not exceed the 8,700 RPM disc rating before powering on. Wear appropriate PPE including a face shield and gloves when operating abrasive flap discs. Inspect the disc for damage before each use and never mount a disc that shows cracking, delamination, or missing flaps.