{"product_id":"osg-300-3390-chucking-reamer-letter-r-solid-carbide","title":"Osg 300-3390 Chucking Reamer Letter R Solid Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe OSG 300-3390 is a solid carbide chucking reamer designed for precision hole finishing in general machining applications. It carries a Letter R designation, corresponding to a decimal diameter of 0.3390 inches, and holds a tight tolerance of +0.0001 to +0.0005 inches, making it suitable for close-tolerance bore work. The straight flute geometry and right-hand cutting direction are well matched to through-hole and blind-hole reaming on CNC machining centers, manual mills, and drill presses. Machinists and tool-and-die professionals are the primary users of this type of reamer.\u003c\/p\u003e\u003cp\u003eThis reamer fits into general-purpose production and job-shop environments where repeatable bore diameters are required. Its bright, uncoated finish makes it appropriate for use on a wide range of workpiece materials under standard cutting conditions. The straight cylindrical shank seats directly in a collet chuck, drill chuck, or ER-style holder without additional adapters. It belongs to the OSG 300D series, which covers standard carbide reamers for general machining applications. No coolant-through capability is incorporated, so external coolant or cutting fluid applied at the entry point is the standard practice.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eLetter R diameter (0.3390 inches) with tolerance of +0.0001 to +0.0005 inches for close-tolerance bore finishing\u003c\/li\u003e\n\u003cli\u003eSolid carbide construction provides rigidity and wear resistance compared to high-speed steel alternatives\u003c\/li\u003e\n\u003cli\u003e6-flute straight geometry for smooth cutting action and consistent surface finish\u003c\/li\u003e\n\u003cli\u003eBright\/uncoated finish suitable for general machining across common workpiece materials\u003c\/li\u003e\n\u003cli\u003eStraight cylindrical shank for direct mounting in collet chucks or ER-style toolholders\u003c\/li\u003e\n\u003cli\u003eNo coolant-through passages — compatible with conventional external coolant delivery\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a general-purpose OEM-style chucking reamer from the OSG 300D series, suited for standard machining center spindles and manual machine tools that accept a straight cylindrical shank reamer of this diameter range.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eA licensed machinist or qualified tooling technician should install and run this reamer. Secure the straight shank in a properly sized collet or chuck to minimize runout before cutting. Ensure the machine spindle is fully stopped and the tool is locked before making any chuck adjustments. Apply appropriate cutting fluid externally at the reaming entry point, as this tool does not support internal coolant delivery.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReamer Diameter (Letter)\u003c\/strong\u003e: R\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReamer Diameter (Decimal Inch)\u003c\/strong\u003e: 0.3390 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReamer Diameter Range\u003c\/strong\u003e: 0.3000 to 0.3499 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiameter Tolerance\u003c\/strong\u003e: +0.0001 to +0.0005 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 1.25 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 6\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Type\u003c\/strong\u003e: Straight\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight Cylindrical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTool Material\u003c\/strong\u003e: Solid Carbide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Bright\/Uncoated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 300D\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.1 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: OSG\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 300-3390\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51746738929970,"sku":"300-3390","price":99.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/b3af7ad9693a92dc89007783f5a05a9f_7fb07ae3-c576-4d02-902b-b242f2de34cc.jpg?v=1788873252","url":"https:\/\/voomisupply.com\/products\/osg-300-3390-chucking-reamer-letter-r-solid-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}