{"product_id":"value-collection-gh8830200-counterbore-5-16-in-4-flute-hss","title":"Value Collection GH8830200 Counterbore 5\/16 in 4 Flute Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe VALUE COLLECTION GH8830200 is a 4-flute interchangeable pilot counterbore designed for precision counterboring operations in metalworking and aircraft-style fabrication applications. The cutter features a 5\/16-inch counterbore diameter and a 19\/64-inch straight shank, with a 4-inch overall length (OAL). Constructed from high speed steel (HSS) with a bright, uncoated polished finish, this tool delivers consistent cutting performance on ferrous and non-ferrous materials. The interchangeable pilot design allows for pilot swaps to match varying hole sizes without replacing the entire tool body. Right-hand cutting direction is standard. Licensed machinists, aircraft maintenance technicians, and tool-and-die professionals are the primary users of this style of counterbore.\u003c\/p\u003e\u003cp\u003eThis counterbore is suited for aircraft-style assembly work, general machining, and production environments where clean, flat-bottomed seat geometry is required for fastener heads or mating surfaces. The interchangeable pilot system accommodates a 3\/32-inch pilot shank diameter, making it appropriate for light to medium counterboring tasks in sheet metal, structural aluminum, and similar materials commonly found in aerospace and industrial maintenance work.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e5\/16-inch counterbore diameter for precise fastener seat geometry\u003c\/li\u003e\n\u003cli\u003e19\/64-inch straight shank for standard toolholder and drill chuck compatibility\u003c\/li\u003e\n\u003cli\u003e4-flute design provides smooth cutting action and improved chip evacuation\u003c\/li\u003e\n\u003cli\u003eHigh speed steel construction for durability across ferrous and non-ferrous materials\u003c\/li\u003e\n\u003cli\u003eBright, uncoated polished finish — no added coating to affect dimensional tolerance\u003c\/li\u003e\n\u003cli\u003eInterchangeable pilot accepts 3\/32-inch pilot shank diameter\u003c\/li\u003e\n\u003cli\u003eAircraft style designation for compliance with aerospace fabrication standards\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use with interchangeable pilot systems accepting a 3\/32-inch pilot shank diameter. Suitable for aircraft-style counterboring applications as an OEM-style replacement or new installation in standard straight-shank toolholders and drill chucks.\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 cutting tool setup and machine tool operation. Ensure the machine spindle is fully stopped and locked out before installing or changing the pilot or tool body. Secure the straight shank firmly in an appropriate drill chuck or toolholder to the chuck or collet manufacturer specifications. Follow applicable shop safety standards and wear appropriate eye protection during all cutting operations.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCounterbore Diameter\u003c\/strong\u003e: 5\/16 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 19\/64 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length (OAL)\u003c\/strong\u003e: 4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePilot Shank Diameter Compatibility\u003c\/strong\u003e: 3\/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\u003eAircraft Style\u003c\/strong\u003e: Yes\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: GH8830200\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51723187487026,"sku":"GH8830200","price":84.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/1a71b7eed2e4aede23651375febef2a7.jpg?v=1788601771","url":"https:\/\/voomisupply.com\/products\/value-collection-gh8830200-counterbore-5-16-in-4-flute-hss","provider":"Voomi Supply","version":"1.0","type":"link"}