Dewalt DW8309 Zirconia Flap Disc T29 4.5in 80 Grit

Product Description

The DEWALT DW8309 is a Type 29 zirconia alumina flap disc designed for aggressive grinding and blending on metal surfaces. Measuring 4.5 inches in diameter with a 7/8-inch arbor hole, it runs at 80 grit — a medium-coarse abrasive that removes material efficiently while leaving a finish suitable for follow-up work. The conical T29 profile keeps the disc face angled against the workpiece, maximizing contact on flat and contoured surfaces. Fabricators, ironworkers, and maintenance tradespeople reach for this disc when they need consistent cut rate without swapping tools between grinding and blending passes.

This disc fits standard 4.5-inch angle grinders common across fabrication shops, job-site metalwork, and maintenance applications. The 80-grit rating is well suited for weld blending, surface prep before coating or painting, and light stock removal on mild steel, stainless steel, and other ferrous metals. The 7/8-inch arbor fits the most widely used grinder spindle size in the trade. Sold individually; minimum order quantity is 10 units.

Key Features

• Type 29 conical flap disc geometry for aggressive stock removal and blending in a single tool
• Zirconia alumina abrasive grain for durability and consistent cut rate on ferrous metals
• 80 grit — medium-coarse for weld blending and surface prep
• 4.5-inch diameter with 7/8-inch arbor fits standard angle grinders
• Lightweight at 0.11 pounds for reduced operator fatigue during extended use

Compatibility

Designed as a standard replacement or consumable flap disc for 4.5-inch angle grinders with a 7/8-inch arbor spindle. Suitable for use on mild steel, stainless steel, and other ferrous metal surfaces.

Installation Notes

Flap discs are installed and changed by metalworking tradespeople and general maintenance mechanics using a standard angle grinder wrench. Always power down and unplug or lock out the grinder before mounting or removing a disc. Confirm the grinder RPM rating meets or exceeds the disc RPM rating before use. Wear appropriate PPE including eye protection and gloves when operating angle grinders.

Technical Specifications

• Disc Type: Type 29 (Conical)
• Abrasive Material: Zirconia Alumina
• Grit: 80
• Diameter: 4.5 inches
• Arbor Size: 7/8 inches
• Weight: 0.11 pounds
• UPC: 028877310459

Standard Information

• Brand: DEWALT
• Manufacturer Part Number: DW8309