{"product_id":"value-collection-gh8840407-counterbore-5-8-in-4-flute-hss","title":"Value Collection GH8840407 Counterbore 5\/8 in 4 Flute Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe VALUE COLLECTION GH8840407 is a 5\/8-inch interchangeable pilot counterbore designed for precision seat-cutting in metalworking and aircraft-style drilling applications. Built from high speed steel with a bright, uncoated polished finish, this tool accepts interchangeable pilots through a 1\/8-inch pilot shank compatibility and mounts via a 1\/4-inch straight shank. The 4-flute configuration delivers smooth, clean cutting action in right-hand rotation. With an overall length of 2.8125 inches, it fits standard drill press and milling machine setups. Licensed tradespeople and machinist technicians working in aerospace, general fabrication, or maintenance environments will find this counterbore well suited for bolt-seat and fastener-recess work.\u003c\/p\u003e\u003cp\u003eThis counterbore is used in applications requiring precise counterbored holes for socket head cap screws, hex bolts, or similar fasteners. The aircraft-style designation indicates compatibility with close-tolerance aerospace and structural fabrication work. It is equally at home in general machine shop environments, maintenance repair operations, and industrial assembly settings where consistent counterbore geometry is required. The interchangeable pilot design allows the operator to swap pilots for different clearance hole diameters without replacing the body.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e5\/8-inch counterbore diameter for standard fastener seat cutting\u003c\/li\u003e\n\u003cli\u003e4-flute design provides smooth chip evacuation and clean seat finish\u003c\/li\u003e\n\u003cli\u003eHigh speed steel construction resists heat buildup during cutting\u003c\/li\u003e\n\u003cli\u003eBright, uncoated polished finish reduces friction and aids chip flow\u003c\/li\u003e\n\u003cli\u003eInterchangeable pilot system — accepts 1\/8-inch pilot shank diameter\u003c\/li\u003e\n\u003cli\u003eAircraft-style geometry for close-tolerance applications\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement or direct-use interchangeable pilot counterbore for machines and drill setups accepting a 1\/4-inch straight shank tooling. Pilot shank compatibility is 1\/8 inch.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation and use of this counterbore should be performed by qualified machinists or maintenance technicians familiar with rotary cutting tools. Secure the 1\/4-inch straight shank firmly in a drill press chuck, milling machine spindle, or compatible toolholder before operation. Ensure the correct interchangeable pilot is seated and locked before starting the cut. Always wear appropriate eye protection and follow shop safety protocols when operating rotating cutting tools.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCounterbore Diameter\u003c\/strong\u003e: 5\/8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 1\/4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePilot Shank Diameter Compatibility\u003c\/strong\u003e: 1\/8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2-13\/16 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 4\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: Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.2 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: VALUE COLLECTION\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: GH8840407\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51721307095346,"sku":"GH8840407","price":87.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/da6a70cb8e675030c8f41ce9168c1703.jpg?v=1788576158","url":"https:\/\/voomisupply.com\/products\/value-collection-gh8840407-counterbore-5-8-in-4-flute-hss","provider":"Voomi Supply","version":"1.0","type":"link"}