Norton 66252839033 Knotted Cup Brush 2-3/4 in Carbon Steel

Product Description

The NORTON 66252839033 is a knotted carbon steel cup brush designed for aggressive surface preparation on metal, welds, and castings. The knotted wire configuration delivers high-impact abrasive action, making it well-suited for removing mill scale, rust, paint, and weld spatter. The brush measures 2.75 inches in diameter with a 1-inch trim length and accepts a standard 5/8-11 threaded arbor. Wire diameter is 0.02 inches. Maximum operating speed is 14,000 RPM. This tool is installed on angle grinders and die grinders by welders, fabricators, pipefitters, and maintenance technicians working on structural steel and heavy equipment.

This cup brush is used in industrial and commercial fabrication environments where fast, thorough surface conditioning is required before welding, coating, or inspection. Typical applications include weld prep and cleanup, rust removal on pipe and structural steel, and surface profiling prior to painting or galvanizing. The single-row knotted fill pattern concentrates wire contact for maximum cutting efficiency on hard materials.

Key Features

• Knotted carbon steel wire for aggressive stock removal and surface conditioning
• 2.75-inch brush diameter sized for use with standard angle grinders
• 0.02-inch wire diameter provides a balance of stiffness and durability
• 5/8-11 threaded arbor hole fits most common grinder spindles without an adapter
• 14,000 RPM maximum operating speed suits high-speed grinder applications
• Single-row construction concentrates wire contact for efficient material removal

Compatibility

Designed as an OEM-style replacement cup brush for angle grinders and die grinders fitted with a 5/8-11 threaded spindle.

Installation Notes

Installation is performed by welders, fabricators, and maintenance technicians using standard 5/8-11 angle grinders. Always power down and unplug or lock out the grinder before mounting or removing the brush. Verify that the tool spindle speed does not exceed the 14,000 RPM maximum rating marked on the brush. Wear appropriate PPE including face shield, safety glasses, and gloves, and ensure the work area is clear of bystanders before operating.