Weiler 94708 Knotted Cup Brush 4 in Steel 9000 Rpm

Product Description

The WEILER 94708 is a knotted steel wire cup brush designed for aggressive surface preparation and weld cleaning on metal workpieces. Measuring 4 inches in diameter with a 0.02-inch wire diameter, it delivers the mechanical bite needed to remove mill scale, rust, paint, and weld spatter from structural steel, pipe, and fabricated assemblies. The double-row knotted fill construction concentrates wire density for faster stock removal compared to crimped-wire designs. Rated to 9,000 RPM, it mounts via a standard 5/8-11 threaded arbor and is compatible with right-angle grinders commonly used in welding, fabrication, and mechanical trade work. Weighing 2.25 pounds, it is built for sustained production use.

This cup brush is suited for weld preparation and post-weld cleanup in structural steel fabrication, pipeline work, heavy equipment repair, and industrial maintenance. Typical applications include removing weld slag and spatter before inspection, prepping base metal before coating or painting, and cleaning corroded or scale-covered surfaces prior to repair. It is used by welders, ironworkers, pipefitters, and maintenance mechanics working with angle grinders in both shop and field environments. The 1.25-inch trim length provides adequate wire exposure for surface contact without excessive flex.

Key Features

• Knotted wire construction for high-aggression stock removal and weld cleaning
• Double-row design increases wire density and contact area per pass
• 4-inch cup diameter with 0.02-inch steel wire for durable, consistent performance
• Rated to 9,000 RPM for use with standard right-angle grinders
• 5/8-11 threaded arbor mounts directly to common grinder spindles without adapters
• 1.25-inch trim length balances wire stiffness and surface coverage

Compatibility

Designed for use with right-angle grinders equipped with a 5/8-11 threaded spindle. Verify the grinder's rated no-load RPM does not exceed 9,000 RPM before mounting.

Installation Notes

Installation and operation should follow ANSI B11 and grinder manufacturer guidelines for abrasive accessories. Always power down and disconnect the grinder from its power source before mounting or removing the cup brush. Confirm the spindle thread engagement is full and the brush is seated squarely before operation. Operators should wear appropriate PPE including face shield, gloves, and hearing protection when running wire cup brushes at rated speed.