Osborn 0003355500 Knotted Steel Cup Brush 2-3/4 in

Product Description

The OSBORN 0003355500 is a knotted steel cup brush designed for aggressive surface preparation and weld cleaning on metal workpieces. The knotted wire construction delivers higher contact pressure than crimped-wire designs, making it effective for removing mill scale, rust, slag, and heavy coatings. The brush measures 2.75 inches in diameter with a 0.014-inch wire diameter and a 7/8-inch trim length. It mounts via a 5/8-11 threaded arbor and is rated for a maximum speed of 14,000 RPM. Metalworkers, fabricators, and maintenance technicians use this brush with right-angle grinders for weld prep and post-weld cleanup on structural steel and similar ferrous materials.

This cup brush is suited for use in metal fabrication shops, maintenance and repair operations, and industrial construction environments. It works with standard 5/8-11 angle grinders commonly found in these settings. The single-row knotted configuration concentrates wire contact for focused material removal on flat surfaces, inside corners, and weld seams. It is appropriate for both light production use and periodic maintenance tasks where consistent surface finish is required before coating or inspection.

Key Features

• Knotted wire construction for aggressive cutting action on rust, scale, and weld slag
• 2.75-inch brush diameter suits standard angle grinder cup brush applications
• 0.014-inch steel wire diameter balances stiffness and coverage
• 5/8-11 threaded arbor mounts directly to most right-angle grinders without adapters
• 14,000 RPM maximum speed rating for compatibility with common grinder speeds
• Single-row design concentrates wire contact for focused surface preparation

Compatibility

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

Installation Notes

Installation and operation should be performed by qualified personnel familiar with angle grinder safety practices. Always power down and disconnect the grinder from its power source before mounting or removing the brush. Verify that the grinder spindle speed does not exceed the 14,000 RPM maximum rating of this brush before use. Operators should wear appropriate PPE including eye protection and gloves, and inspect the brush for damaged or broken wires before each use.