{"product_id":"value-collection-gh8790248-counterbore-3-8in-3-flute-hss","title":"Value Collection GH8790248 Counterbore 3\/8in 3 Flute Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe VALUE COLLECTION GH8790248 is a 3-flute interchangeable pilot counterbore designed for precision enlarging and finishing of drilled holes to accept fastener heads in metal fabrication and machining applications. Built from high speed steel with a bright, uncoated finish, this counterbore measures 3\/8 inches in diameter and accepts a 5\/32-inch pilot shank for accurate hole centering. The straight shank measures 5\/16 inches in diameter and 3-1\/16 inches in length, with an overall length of 4-1\/16 inches. Right-hand cutting direction and a polished surface finish contribute to clean, consistent results in production and repair environments. Machinists and tool-and-die professionals are the primary users of this tooling.\u003c\/p\u003e\n\u003cp\u003eThis counterbore is suited for use in drill press, milling machine, and manual or CNC machining setups where a flat-bottomed recess is required for socket head cap screws, bolts, or other flush-mount fasteners. The interchangeable pilot design allows the same body to be used with different pilot diameters as job requirements change, reducing the need for multiple dedicated tools. Applications commonly include aerospace-adjacent fabrication, general metalworking, and maintenance repair operations on steel and similar materials.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e3\/8-inch counterbore diameter for standard fastener head recessing\u003c\/li\u003e\n  \u003cli\u003eHigh speed steel construction for durability in metal cutting applications\u003c\/li\u003e\n  \u003cli\u003e3 flutes for efficient chip evacuation and smooth finish\u003c\/li\u003e\n  \u003cli\u003eInterchangeable pilot accepts 5\/32-inch pilot shank for repeatable hole centering\u003c\/li\u003e\n  \u003cli\u003eStraight 5\/16-inch shank compatible with standard drill chucks and collets\u003c\/li\u003e\n  \u003cli\u003eBright, uncoated finish with polished surface for reduced friction during cutting\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style interchangeable pilot counterbore for use in standard drill presses, milling machines, and similar metalworking equipment that accept a 5\/16-inch straight shank tooling.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is typically performed by a machinist or skilled fabricator. Secure the straight shank firmly in a drill chuck or collet before operation, and confirm the correct pilot diameter is seated before cutting. Ensure the workpiece is clamped securely and the spindle speed is appropriate for the material and tool diameter. Do not exceed the recommended RPM for high speed steel tooling in the material being cut.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCounterbore Diameter\u003c\/strong\u003e: 3\/8 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 3\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 5\/16 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Length\u003c\/strong\u003e: 3-1\/16 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 4-1\/16 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePilot Shank Diameter Compatibility\u003c\/strong\u003e: 5\/32 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTool Material\u003c\/strong\u003e: High Speed Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Bright, Uncoated, Polished\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.18 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: VALUE COLLECTION\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: GH8790248\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51711678251314,"sku":"GH8790248","price":77.68,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/dc754c06a218f1c5b3d729fb80e71204.jpg?v=1788478419","url":"https:\/\/voomisupply.com\/products\/value-collection-gh8790248-counterbore-3-8in-3-flute-hss","provider":"Voomi Supply","version":"1.0","type":"link"}