Dewalt DW49157 Knotted Cup Brush 3 in Steel Wire

Product Description

The DEWALT DW49157 is a knotted wire cup brush designed for aggressive surface preparation on metal and other hard materials. Built with steel fill wire at 0.02 inches in diameter, the knotted construction delivers fast, effective removal of rust, scale, weld spatter, and mill scale. The 3-inch brush diameter and single-row design concentrate wire contact for high cutting action. A 5/8-11 threaded arbor fits directly onto angle grinders commonly used by welders, ironworkers, pipefitters, and HVAC fabricators. Rated to 14,000 RPM maximum, this brush is built for high-speed grinder use. The 7/8-inch trim length provides consistent wire exposure throughout the service life of the brush.

This cup brush is suited for surface prep applications in light industrial, commercial, and field environments. Typical uses include cleaning weld joints prior to inspection, removing corrosion from structural steel and pipe, and prepping metal surfaces before coating or paint application. It is a common tool on pipefitting, plumbing, HVAC sheet metal, and general ironwork jobs where a standard disc grinder is already on hand. The compact 3-inch diameter makes it manageable in tighter work areas compared to larger cup brushes.

Key Features

• Knotted steel wire fill for aggressive material removal and fast surface prep
• 3-inch brush diameter with single-row construction for concentrated cutting action
• 0.02-inch wire diameter balances stiffness with effective rust and scale removal
• 5/8-11 threaded arbor for direct mount on standard angle grinders
• 14,000 RPM maximum rating for use with high-speed grinders
• 7/8-inch trim length for consistent performance through the brush life

Compatibility

Designed for use with angle grinders equipped with a 5/8-11 threaded spindle, which is the standard arbor size on most 4-inch to 5-inch angle grinders used in trade applications.

Installation Notes

Installation should be performed by a qualified tradesperson familiar with angle grinder safety practices. Before mounting, confirm the grinder spindle speed does not exceed the 14,000 RPM maximum rating marked on the brush. Always power down and unplug or de-energize the grinder before changing attachments. Wear appropriate PPE including a face shield rated for grinding operations and leather gloves when handling wire brushes.