{"product_id":"value-collection-gh8830424-counterbore-21-32-in-4-flute-hss","title":"Value Collection GH8830424 Counterbore 21\/32 in 4 Flute Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe VALUE COLLECTION GH8830424 is an interchangeable pilot counterbore designed for precision counterboring operations in metal fabrication and aerospace-style applications. Built from high speed steel with a bright, uncoated polished finish, this tool features a 21\/32-inch counterbore diameter and a 1\/2-inch straight shank for secure chuck engagement. Four right-hand cutting flutes deliver clean, consistent material removal. The 5-3\/8-inch overall length provides reach and clearance in a range of drilling setups. It is used by machinists, tool-and-die workers, and aircraft maintenance technicians requiring reliable counterbore geometry.\u003c\/p\u003e\u003cp\u003eThis counterbore is suited for aircraft-style applications where interchangeable pilots allow a single body to accommodate multiple pilot shank diameters. The included pilot shank compatibility is 3\/16 inch. Typical use cases include spot-facing bolt seats, countersinking fastener recesses, and preparing hole geometry for flush or recessed hardware in aluminum, mild steel, and similar materials. The straight shank mounts directly in standard drill press chucks, milling machine spindles, or CNC tool holders without adapters.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e21\/32-inch counterbore diameter for precise recess sizing\u003c\/li\u003e\n\u003cli\u003e1\/2-inch straight shank fits standard chucks and collets\u003c\/li\u003e\n\u003cli\u003e4 right-hand cutting flutes for smooth, efficient stock removal\u003c\/li\u003e\n\u003cli\u003eHigh speed steel construction for durability across ferrous and non-ferrous metals\u003c\/li\u003e\n\u003cli\u003eBright, uncoated polished finish suitable for general-purpose machining\u003c\/li\u003e\n\u003cli\u003eAircraft-style interchangeable pilot design accepts 3\/16-inch pilot shank\u003c\/li\u003e\n\u003cli\u003e5-3\/8-inch overall length provides adequate reach for most setups\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an interchangeable pilot counterbore compatible with 3\/16-inch pilot shanks. Suitable for use in drill presses, milling machines, and CNC spindles accepting a 1\/2-inch straight shank toolholder.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation and use should be performed by qualified machinists or maintenance technicians familiar with rotating cutting tools. Ensure the machine spindle is fully powered down and the chuck or collet is locked before installing or removing the counterbore. Verify pilot shank engagement and shank seating before beginning the cut. Always operate within the recommended speed range for high speed steel tooling and the workpiece material.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCounterbore Diameter\u003c\/strong\u003e: 21\/32 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 Type\u003c\/strong\u003e: Straight\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\u003eOverall Length\u003c\/strong\u003e: 5-3\/8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 4\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: GH8830424\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51724024906034,"sku":"GH8830424","price":143.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/2240e1441d6a2d4c79a52efb2d98e19c_e427e6ce-2312-4b88-9d0f-679bb513dd5f.jpg?v=1788611780","url":"https:\/\/voomisupply.com\/products\/value-collection-gh8830424-counterbore-21-32-in-4-flute-hss","provider":"Voomi Supply","version":"1.0","type":"link"}