Pferd 79182220 Knotted Cup Brush 2-3/4 in Carbon Steel

Product Description

The PFERD 79182220 is a knotted carbon steel cup brush designed for aggressive surface preparation on metal, welds, and castings. Measuring 2.75 inches in diameter with a wire diameter of 0.02 inches, it delivers the wire tension and abrasive action required for scale removal, rust elimination, and weld spatter cleanup. The knotted wire configuration concentrates contact force, making it well suited for heavy-duty deburring and surface conditioning tasks. It fits standard angle grinders via the 5/8-11 threaded arbor and is rated to 14,000 RPM, keeping it compatible with most 4-inch and 5-inch right-angle grinders used in fabrication and maintenance work.

This cup brush is used in industrial fabrication, structural steel work, pipeline maintenance, and general metalworking. It performs best on flat and contoured surfaces where a consistent, high-pressure scrubbing action is needed before coating, welding, or inspection. The single-row knotted fill pattern is a common choice for trades including ironworkers, pipefitters, welders, and maintenance mechanics who need reliable material removal without switching tools. The 0.875 inch trim length provides good wire projection and service life before replacement is needed.

Key Features

• Knotted wire fill increases contact pressure for heavy-duty scale and rust removal
• 2.75 inch diameter fits standard 4-inch and 5-inch angle grinder cup brush applications
• 5/8-11 threaded arbor hole for direct mounting to compatible angle grinders
• 14,000 RPM maximum speed rating suitable for most right-angle grinder models
• Single-row construction for consistent wire density and predictable wear
• 0.875 inch trim length provides extended service life before wire fatigue

Compatibility

Designed for use with angle grinders equipped with a 5/8-11 threaded spindle. Verify that the grinder's rated no-load RPM does not exceed 14,000 RPM before mounting.

Installation Notes

Installation and use should be performed by qualified personnel familiar with powered abrasive tool safety. Always power down and disconnect the grinder from its power source before mounting or removing the cup brush. Confirm the arbor thread engagement is secure and the tool guard is in place before operating. Always wear appropriate PPE including face shield, gloves, and hearing protection when using wire brushes at rated speed.