{"product_id":"value-collection-gh8790396-counterbore-39-64-in-3-flute-hss","title":"Value Collection GH8790396 Counterbore 39\/64 in 3 Flute Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe VALUE COLLECTION GH8790396 is a 3-flute interchangeable pilot counterbore designed for precision counterboring operations in metal fabrication and machining applications. Built from high speed steel with a bright, uncoated finish, this tool delivers consistent cutting performance in drilling and boring setups. The straight shank measures 1\/2 inch in diameter and 3-7\/8 inches in length, with an overall length of 5-1\/8 inches. The 39\/64-inch counterbore diameter is paired with a 3\/16-inch pilot shank compatibility, making it suitable for controlled spot-facing and counterboring of bolt-hole patterns and fastener seats.\u003c\/p\u003e\n\u003cp\u003eThis counterbore is used in machine shop, manufacturing, and maintenance environments where accurate fastener recessing is required. It is compatible with standard drill press, milling machine, and CNC setups that accept straight shank tooling. Right-hand cutting geometry makes it appropriate for conventional clockwise-spindle equipment. Machinists and maintenance technicians working with bolt flange preparations and precision hole finishing will find this tool a reliable fit for standard production and repair workflows.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e39\/64-inch counterbore diameter for precise fastener seat preparation\u003c\/li\u003e\n  \u003cli\u003eHigh speed steel construction for durability in ferrous and non-ferrous materials\u003c\/li\u003e\n  \u003cli\u003e3-flute design provides balanced cutting action and chip evacuation\u003c\/li\u003e\n  \u003cli\u003eStraight shank at 1\/2 inch diameter for secure chuck retention\u003c\/li\u003e\n  \u003cli\u003eBright, uncoated polished finish suitable for general-purpose machining\u003c\/li\u003e\n  \u003cli\u003eRight-hand cutting direction compatible with standard spindle rotation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use with interchangeable pilot counterbore systems accepting a 3\/16-inch pilot shank and a 1\/2-inch straight shank. Fits standard drill press, milling machine, and CNC spindle chucks designed for straight shank tooling.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a qualified machinist familiar with rotating cutting tool procedures. Secure the straight shank firmly in a compatible chuck before operation and verify that spindle speed is appropriate for the workpiece material and tool diameter. Always power down and lock out the spindle before changing pilots or inspecting the cutting edges. Do not exceed the tool's rated operating parameters for feed rate or depth of cut.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCounterbore Diameter\u003c\/strong\u003e: 39\/64 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 1\/2 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Length\u003c\/strong\u003e: 3-7\/8 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 5-1\/8 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePilot Shank Diameter Compatibility\u003c\/strong\u003e: 3\/16 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\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\u003eAircraft Style\u003c\/strong\u003e: No\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: GH8790396\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51698548998450,"sku":"GH8790396","price":135.36,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/8947ca714942834c4e7d77690c7c4a26.jpg?v=1788364547","url":"https:\/\/voomisupply.com\/products\/value-collection-gh8790396-counterbore-39-64-in-3-flute-hss","provider":"Voomi Supply","version":"1.0","type":"link"}