{"product_id":"walter-surface-technologies-13g304-knotted-cup-brush-3-in","title":"Walter Surface Technologies 13G304 Knotted Cup Brush 3 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe WALTER SURFACE TECHNOLOGIES 13G304 is a knotted carbon steel cup brush designed for aggressive surface preparation on metal workpieces. The knotted wire configuration delivers concentrated abrasive action suited for removing weld spatter, rust, mill scale, and heavy coatings. Wire diameter measures 0.020 inches, and the brush spins up to 12,000 RPM, making it effective on angle grinders and die grinders. A single-row construction and bridled design help maintain wire alignment under load, extending usable brush life. Weighing 0.66 pounds, this brush is a direct fit for grinder-based surface work in fabrication, maintenance, and repair environments.\u003c\/p\u003e\n\u003cp\u003eThis cup brush is suited for use in metal fabrication shops, structural steel work, pipe prep, and weld cleanup applications. The threaded arbor with a 5\/8-11 thread size fits standard angle grinders used by ironworkers, pipefitters, and maintenance technicians. It handles demanding surface prep tasks where flat wire brushes lack the cutting aggression needed for heavily contaminated or corroded surfaces. Single-row knotted construction is particularly well matched to tight weld seams and contoured surfaces that require directed wire contact.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eKnotted carbon steel wire for high-aggression surface prep and weld cleanup\u003c\/li\u003e\n  \u003cli\u003e0.020-inch wire diameter balances cutting action with wire durability\u003c\/li\u003e\n  \u003cli\u003e12,000 RPM maximum speed rating compatible with standard angle grinders\u003c\/li\u003e\n  \u003cli\u003eThreaded arbor with 5\/8-11 thread fits common grinder spindle sizes\u003c\/li\u003e\n  \u003cli\u003eBridled construction maintains wire alignment and extends brush service life\u003c\/li\u003e\n  \u003cli\u003eSingle-row design concentrates abrasive contact on weld seams and tight areas\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use with angle grinders and similar rotary tools fitted with a 5\/8-11 threaded spindle. Confirm tool RPM rating meets or exceeds the brush maximum before mounting.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a qualified technician familiar with angle grinder safety procedures. Always power down and disconnect the grinder before mounting or removing the brush. Verify the grinder spindle thread is 5\/8-11 and that the tool RPM rating is compatible with this brush before operation. Use appropriate personal protective equipment including eye and face protection when operating wire brushes at speed.\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: 12,000\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBridled\u003c\/strong\u003e: Yes\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: 0.66 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 31191521\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: 13G304\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"WALTER","offers":[{"title":"Default Title","offer_id":67911855866162,"sku":"13G304","price":52.26,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/e5767bd9f605121add8eddeaac680ab7.jpg?v=1791221947","url":"https:\/\/voomisupply.com\/products\/walter-surface-technologies-13g304-knotted-cup-brush-3-in","provider":"Voomi Supply","version":"1.0","type":"link"}