Weiler 94704 Knotted Cup Brush 6 in Steel Wire

Product Description

The WEILER 94704 is a knotted steel wire cup brush designed for aggressive surface preparation on angle grinders and compatible threaded-arbor power tools. With a 6-inch brush diameter and 0.023-inch wire diameter, it delivers fast cutting action on weld spatter, mill scale, rust, and heavy coatings. The knotted wire configuration twists individual wire strands into bundles, concentrating contact pressure at the tips for more aggressive stock removal than crimped-wire styles. Rated to a maximum of 6,600 RPM, it threads directly onto the spindle via a 5/8-11 arbor hole with no adapter required. Metalworkers, fabricators, and pipefitters reach for this brush when a flap disc or grinding wheel is not aggressive enough for the surface condition at hand.

This cup brush fits typical angle grinder applications in structural steel fabrication, pipeline work, shipbuilding, and heavy equipment repair. It is well suited for pre-weld joint cleaning, inter-pass weld cleaning, and post-weld scale removal on carbon steel surfaces. The single-row knotted fill and 1.375-inch trim length maintain consistent contact across curved or irregular workpiece profiles. It is intended for professional use by metalworkers and maintenance technicians operating angle grinders with a 5/8-11 threaded spindle.

Key Features

• Knotted wire construction for aggressive removal of scale, rust, and weld spatter
• 6-inch brush diameter provides broad coverage per pass
• 0.023-inch steel wire diameter balances stiffness and durability
• 5/8-11 threaded arbor hole mounts directly to standard angle grinder spindles
• Single-row fill with 1.375-inch trim length maintains contact on contoured surfaces
• 6,600 RPM maximum rating suitable for mid-size angle grinders

Compatibility

Designed for use on angle grinders and stationary bench tools fitted with a 5/8-11 threaded arbor spindle. Always verify the tool's rated no-load RPM does not exceed the brush maximum of 6,600 RPM before mounting.

Installation Notes

Installation and operation should be performed by qualified metalworkers familiar with angle grinder safety practices. Disconnect the tool from power before mounting or removing the brush, and confirm the spindle thread is 5/8-11 before threading on the arbor. Always wear a full face shield rated for wire wheel use, along with appropriate PPE including gloves and hearing protection. Never exceed the 6,600 RPM maximum speed marked on the brush, and inspect the wire fill for fatigue or splayed strands before each use.