{"product_id":"grier-abrasives-a21-n2-17550-mounted-point-fine-aluminum-oxide","title":"Grier Abrasives A21-N2-17550 Mounted Point Fine Aluminum Oxide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe GRIER ABRASIVES A21-N2-17550 is a ball-shaped mounted point abrasive designed for precision grinding, deburring, and surface finishing in metalworking and fabrication applications. It uses an aluminum oxide abrasive grain bonded in a unitized construction with a fine grade and medium density rating. The 1\/4-inch diameter shank fits standard die grinders and rotary tools, and the point is rated to a maximum of 34,500 RPM. At 0.037 pounds, this is a lightweight consumable suited for close-tolerance work on ferrous and non-ferrous metals.\u003c\/p\u003e\u003cp\u003eThis mounted point is typically used in production grinding, weld cleanup, port matching, and contour finishing on metal parts. The ball shape allows access to concave surfaces, bores, and irregular profiles where flat wheels cannot reach. The fine grade makes it appropriate for finishing passes and light material removal where surface quality matters. It is used by machinists, fabricators, and tool-and-die professionals working with die grinders or bench-mounted flex shafts.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eBall shape (A21 point shape code) for grinding concave surfaces and internal profiles\u003c\/li\u003e\n\u003cli\u003eAluminum oxide abrasive grain for use on steel, cast iron, and general ferrous metals\u003c\/li\u003e\n\u003cli\u003eFine grade, medium density unitized bond for controlled material removal and smooth finish\u003c\/li\u003e\n\u003cli\u003eRated to 34,500 RPM maximum for use with standard die grinders\u003c\/li\u003e\n\u003cli\u003e1\/4-inch shank diameter fits the most common collets and chucks\u003c\/li\u003e\n\u003cli\u003eGreen color designation for quick identification in multi-point setups\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement mounted point for use in die grinders and rotary tools accepting a 1\/4-inch shank, suitable for metalworking and fabrication grinding applications.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eMounted points are installed and serviced by machinists and metalworking professionals. Before mounting, verify that the spindle speed of the die grinder does not exceed the 34,500 RPM rating marked on this point. Tighten the collet or chuck securely before operation and inspect the abrasive for cracks or chips prior to each use. Always wear appropriate PPE including eye protection when operating rotary abrasives.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePoint Shape\u003c\/strong\u003e: Ball\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePoint Shape Code\u003c\/strong\u003e: A21\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAbrasive Material\u003c\/strong\u003e: Aluminum Oxide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrade\u003c\/strong\u003e: Fine\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBond Type\u003c\/strong\u003e: Unitized\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDensity\/Hardness\u003c\/strong\u003e: Medium\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Thickness\u003c\/strong\u003e: 1 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 1\/4 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Length\u003c\/strong\u003e: 1-1\/2 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum RPM\u003c\/strong\u003e: 34,500\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor\u003c\/strong\u003e: Green\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.037 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 23131514\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: GRIER ABRASIVES\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: A21-N2-17550\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRIER ABRASIVES","offers":[{"title":"Default Title","offer_id":67912737030450,"sku":"A21-N2-17550","price":25.84,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/1d1dc6c9c778b1e69f7ae82573d33ca7.jpg?v=1791239133","url":"https:\/\/voomisupply.com\/products\/grier-abrasives-a21-n2-17550-mounted-point-fine-aluminum-oxide","provider":"Voomi Supply","version":"1.0","type":"link"}