13F302 - Walter 3-Inch Knot-Twisted Wire Cup Brush with M14x2.0 Arbor

Industrial-Grade Surface Preparation

The Walter 13F302 is a high-performance 3-inch wire cup brush engineered for the most demanding industrial environments. Designed specifically for angle grinders with an M14 x 2.0 spindle, this tool represents the pinnacle of surface preparation technology. At the core of its performance is the premium knot-twisted wire construction. Unlike crimped wire brushes that are designed for lighter surface finishing, the knot-twisted design bundles high-tensile steel wires into tight, aggressive knots. This configuration delivers high-impact cleaning power, making it the tool of choice for removing stubborn contaminants such as heavy mill scale, thick rust, slag, and multiple layers of old paint.

Walter Surface Technologies is renowned for its commitment to safety and durability, and the 13F302 is no exception. The wire used in this cup brush is oil-hardened and tempered, a process that significantly enhances the fatigue resistance of each filament. This metallurgical treatment ensures that the wires maintain their stiffness and cutting action over a longer service life, while also drastically reducing the risk of wire breakage—a common safety hazard with inferior brushes. Furthermore, each brush is precision-balanced during manufacturing. This attention to balance minimizes vibration during high-speed rotation, protecting both the angle grinder's bearings and the operator from the fatigue associated with long-duration grinding tasks.

This 3-inch model is particularly effective for working on large flat surfaces or curved steel structures where aggressive material removal is required before welding or painting. The M14 x 2.0 threaded arbor ensures a secure and direct mount to compatible European-style or specialized angle grinders, eliminating the need for adapters that can introduce runout. Whether used in a fabrication shop, a shipyard, or a pipeline maintenance site, the Walter 13F302 delivers consistent, heavy-duty performance that professionals trust to get the job done right the first time.