Osborn 0003303000 Knotted Cup Wire Brush 6 in Steel

Product Description

The OSBORN 0003303000 is a knotted cup wire brush designed for heavy-duty surface preparation and cleaning on metal, welds, and castings. Built with 0.02-inch diameter steel fill wire in a knotted configuration, it delivers aggressive cutting action that removes rust, scale, mill scale, paint, and weld spatter more effectively than crimped-wire alternatives. The single-row design concentrates wire contact for focused stock removal. Rated to a maximum of 6,000 RPM, this brush fits angle grinders and right-angle tools via a standard 5/8-11 threaded arbor. The 1.75-inch trim length provides the flex and wire life needed for sustained use in fabrication and maintenance environments.

This cup brush is suited for structural steel prep, pipeline maintenance, weld seam cleaning, and surface conditioning ahead of coating or inspection. It is a common tool in metal fabrication shops, shipyards, refineries, and general industrial maintenance settings. Licensed professionals and skilled tradespeople in welding, pipefitting, and millwright work typically use this brush alongside angle grinders for pre-weld and post-weld cleaning operations. The 6-inch diameter gives broad coverage on flat and slightly curved surfaces.

Key Features

• Knotted steel wire fill for aggressive rust, scale, and weld spatter removal
• 6-inch brush diameter provides wide surface coverage per pass
• 0.02-inch wire diameter balances aggression and wire life
• 5/8-11 threaded arbor hole fits standard angle grinders
• 6,000 RPM maximum rating for compatibility with common grinder speeds
• Single-row construction for concentrated, controlled cleaning action

Compatibility

Designed for use with angle grinders and right-angle power tools equipped with a 5/8-11 threaded spindle.

Installation Notes

Installation and use should be performed by qualified personnel familiar with rotating wire brush safety practices. Always verify the tool spindle speed does not exceed the 6,000 RPM maximum rating of the brush before operation. Disconnect power to the grinder and confirm it is fully stopped before mounting or removing the brush. Wear appropriate PPE including face shield, gloves, and hearing protection during use, and inspect the brush for broken or loose wires before each operation.