13F304 - Walter 3-Inch Knot Wire Cup Brush for Steel - 5/8-11 Arbor

Heavy-Duty Surface Preparation with Walter Quality

The Walter 13F304 Knot Twist Cup Brush is a premium abrasive tool designed for the most demanding industrial cleaning applications. Engineered by Walter Surface Technologies, this 3-inch cup brush features high-grade carbon steel wire that has been oil-hardened and tempered. This rigorous manufacturing process ensures that each wire strand maintains its integrity and cutting power even under extreme pressure and heat. For professionals in fabrication, construction, and maintenance, this means a tool that lasts longer and performs more consistently than generic alternatives.

One of the standout features of Walter wire brushes is their internal balance. Improperly balanced brushes can cause severe vibration in angle grinders, leading to premature tool wear and operator fatigue (white finger syndrome). The 13F304 is precision-balanced to run smoothly, allowing operators to work for longer periods with greater control and safety. The knot twist design bundles the wires together to create a rigid, aggressive brushing face that digs deep into surfaces to remove stubborn contaminants.

Industrial Applications

This brush is specifically designed for use on carbon steel. It excels at removing heavy rust, thick paint, corrosion, and mill scale from large flat or curved surfaces. The 3-inch diameter is perfectly sized for standard angle grinders, making it versatile enough for both open surface work and tighter areas where a larger 6-inch brush might be unwieldy. Whether you are prepping a surface for coating or cleaning up metal parts in a machine shop, the Walter 13F304 delivers the aggressive action required to get the job done efficiently.

Safety Note: Always ensure your angle grinder's RPM does not exceed the maximum RPM rating of the brush. Wear appropriate eye and face protection, as wire filaments can detach during operation.