Norton 66254419978 Flap Disc 4.5in 7/8in 40 Grit Type 29

Product Description

The NORTON 66254419978 is a Powerflex Type 29 flap disc designed for aggressive material removal on metal, weld seams, and fabricated surfaces. Built in a 4.5-inch diameter with a 7/8-inch arbor hole and a 40-grit abrasive, this disc combines cutting action with a slight conical profile that allows the abrasive cloth to flex and conform to contoured or flat workpieces. The 40-grit designation makes it well suited for heavy stock removal, weld blending, and surface conditioning where speed of cut is the priority. Sold individually, with a minimum order quantity of 10 and a case quantity of 10.

This flap disc is intended for use in metal fabrication shops, structural steel work, pipe work, and general industrial grinding applications. The Type 29 conical geometry provides an aggressive grinding angle that increases contact area on flat surfaces compared to a Type 27 disc, making it a common choice for weld dressing and rapid stock removal on mild steel, stainless steel, and similar metals. It is commonly used by welders, ironworkers, pipefitters, and metal fabricators who require consistent, repeatable surface preparation.

Key Features

• Type 29 conical profile increases contact area for aggressive flat-surface grinding and weld blending
• 40-grit abrasive provides fast stock removal on metal and welded joints
• 4.5-inch diameter with 7/8-inch arbor fits standard right-angle grinders
• Powerflex construction allows abrasive cloth to flex and conform to workpiece contours
• Sold by the case of 10 discs for consistent supply on production jobs

Compatibility

Designed for use with standard 4.5-inch right-angle grinders equipped with a 7/8-inch arbor, which is a common configuration across professional-grade angle grinders in the trade.

Installation Notes

Installation and use should be performed by a qualified operator familiar with angle grinder safety practices. Always confirm the grinder's rated RPM meets or exceeds the disc's rated speed before mounting. Inspect the disc for damage before each use and never use a cracked or delaminated flap disc. Wear appropriate PPE including eye protection and gloves, and ensure all workpiece clamps and fixtures are secure before grinding.

Technical Specifications

• Disc Diameter: 4.5 inches
• Arbor Size: 7/8 inch
• Grit: 40
• Disc Type: Type 29
• Series: Powerflex
• Unit of Measure: Each
• Minimum Order Quantity: 10
• Case Quantity: 10

Standard Information

• Brand: NORTON
• Manufacturer Part Number: 66254419978