Tru-maxx 88539 Knotted Steel Cup Brush 2-3/4 in

Product Description

The TRU-MAXX 88539 is a knotted steel wire cup brush designed for heavy-duty surface preparation on angle grinders and other threaded-arbor power tools. With a 2-3/4 inch diameter and 0.02 inch wire diameter, this single-row cup brush delivers aggressive cutting action suited for removing rust, scale, weld spatter, and paint from metal surfaces. The 5/8-11 threaded arbor fits standard angle grinders used in the trades. Rated to 14,000 RPM maximum, it handles the output of most 4-inch and 4-1/2 inch grinders. The 1 inch trim length provides consistent contact pressure across the work surface. Installers in HVAC, plumbing, electrical, and general fabrication rely on cup brushes like this for prep work before brazing, welding, or coating.

This cup brush suits residential and commercial job sites where metal surface prep is required before joining, coating, or inspection. Common applications include cleaning pipe ends before brazing or soldering, removing mill scale from steel stock, cleaning weld joints, and stripping corrosion from structural and mechanical components. It is appropriate for use by HVAC technicians, pipefitters, welders, electricians, and maintenance trades working with ferrous metals. The knotted wire construction holds up under sustained pressure better than crimped wire, making it the preferred choice for coarser, more aggressive descaling tasks.

Key Features

• Knotted steel wire construction for aggressive rust, scale, and spatter removal
• 2-3/4 inch brush diameter with single-row configuration for focused contact
• 0.02 inch wire diameter balances stiffness with surface coverage
• 5/8-11 threaded arbor fits standard angle grinders
• 14,000 RPM maximum rating compatible with most 4 to 4-1/2 inch grinders
• 1 inch trim length maintains consistent working pressure during use

Compatibility

Designed for use with angle grinders and power tools equipped with a 5/8-11 threaded arbor. Suitable for ferrous metal surface preparation applications in the HVAC, plumbing, welding, and electrical trades.

Installation Notes

Installation and use of cup brushes should be performed by qualified trade professionals following ANSI B7.1 safety standards for abrasive wheels and wire brushes. Always confirm the tool spindle speed does not exceed the 14,000 RPM maximum rating before mounting. Wear ANSI-rated eye protection and a face shield, as wire bristles can break free during operation. Ensure the arbor is fully threaded and the brush is seated securely before powering on the tool.