{"product_id":"walter-surface-technologies-13f354-knotted-cup-brush","title":"Walter Surface Technologies 13F354 Knotted Cup Brush","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe WALTER SURFACE TECHNOLOGIES 13F354 is a knotted carbon steel cup brush designed for aggressive surface preparation on metal workpieces. The 3-inch diameter single-row construction delivers concentrated scrubbing action suited for weld cleaning, rust removal, mill scale removal, and paint stripping. Knotted wire fill provides greater stiffness and cutting action compared to crimped wire, making it the right choice for heavy-scale removal and surface profiling. The brush spins up to 12000 RPM and mounts via a standard 5\/8-11 threaded arbor. Wire diameter is 0.020 inches. At 0.71 pounds, the brush is compact enough for standard angle grinder use without adding significant head weight.\u003c\/p\u003e\n\u003cp\u003eThis cup brush is used in fabrication shops, structural steel work, pipeline maintenance, and heavy manufacturing environments where surface condition is critical before coating or welding. Metalworkers, pipefitters, ironworkers, and maintenance mechanics reach for knotted cup brushes when a crimped wire brush lacks the aggression the job requires. Typical applications include preparing weld joints, removing oxidation from ferrous metal, and conditioning surfaces before primer application. The threaded arbor mount suits most 4-inch to 4.5-inch angle grinders equipped with a 5\/8-11 spindle.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eKnotted carbon steel wire fill for aggressive material removal and long service life\u003c\/li\u003e\n  \u003cli\u003e3-inch brush diameter with single-row configuration for concentrated contact\u003c\/li\u003e\n  \u003cli\u003e0.020-inch wire diameter balances stiffness with surface reach\u003c\/li\u003e\n  \u003cli\u003eMaximum operating speed of 12000 RPM suitable for standard angle grinders\u003c\/li\u003e\n  \u003cli\u003e5\/8-11 threaded arbor for direct mount  -  no separate adapter required\u003c\/li\u003e\n  \u003cli\u003eOrange brush color for quick identification on the job site\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use with angle grinders and die grinders fitted with a 5\/8-11 threaded spindle. Verify tool RPM rating meets or exceeds 12000 RPM before mounting.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a qualified operator familiar with abrasive wheel safety. Always confirm the grinder spindle speed does not exceed the brush maximum rated RPM of 12000 before use. Power down and disconnect the tool from its power source before mounting or removing the brush. Wear appropriate PPE including face shield, safety glasses, and gloves when operating wire cup brushes, as wire filaments can break free during use.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrush Diameter\u003c\/strong\u003e: 3 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWire Diameter\u003c\/strong\u003e: 0.020 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFill Material\u003c\/strong\u003e: Carbon Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrush Type\u003c\/strong\u003e: Knotted\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRow Count\u003c\/strong\u003e: Single Row\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eArbor Type\u003c\/strong\u003e: Threaded Arbor\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eArbor Thread Size\u003c\/strong\u003e: 5\/8-11\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum RPM\u003c\/strong\u003e: 12000\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrush Color\u003c\/strong\u003e: Orange\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.71 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: WALTER SURFACE TECHNOLOGIES\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 13F354\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"WALTER","offers":[{"title":"Default Title","offer_id":67908529848626,"sku":"13F354","price":32.57,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/9fc9dde9bd1f2917f89dcf12600f5b24.jpg?v=1791183882","url":"https:\/\/voomisupply.com\/products\/walter-surface-technologies-13f354-knotted-cup-brush","provider":"Voomi Supply","version":"1.0","type":"link"}