{"product_id":"keo-902-000-015-solid-pilot-counterbore-0-346-in-3-flute","title":"Keo 902-000-015 Solid Pilot Counterbore 0.346 in 3 Flute","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe KEO 902-000-015 is a solid pilot counterbore designed for precision seat cutting in metal fabrication and machine shop applications. Built from cobalt steel with a bright, uncoated finish, this tool delivers the hardness and heat resistance required for consistent performance in ferrous and harder materials. It features a 0.346-inch counterbore diameter, a 0.221-inch oversize pilot diameter, and three flutes for efficient chip evacuation and a clean, accurate bore seat. The straight-cylindrical shank measures 9\/32 inch in diameter, providing secure tool holding in standard drill press or milling machine setups. Machinists and tool-and-die professionals rely on this style of counterbore for flush-seat preparation work.\u003c\/p\u003e\u003cp\u003eThis counterbore is sized for use with number 10 socket-head cap screws, making it well suited for tooling fixtures, machine components, and mechanical assemblies where cap screws must sit flush or below the workpiece surface. The oversize pilot ensures the tool tracks cleanly in a pre-drilled clearance hole, maintaining concentricity between the pilot bore and the counterbore seat. Its 4.5-inch overall length provides adequate reach for standard workpiece thicknesses encountered in general machining and production environments. The forward cutting direction is standard for right-hand drill press and mill spindle operation.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eCobalt steel construction for increased hardness and heat resistance compared to standard high-speed steel\u003c\/li\u003e\n\u003cli\u003e0.346-inch counterbore diameter sized for number 10 socket-head cap screws\u003c\/li\u003e\n\u003cli\u003e0.221-inch oversize pilot diameter maintains concentricity in pre-drilled holes\u003c\/li\u003e\n\u003cli\u003eThree-flute geometry promotes efficient chip clearance and smooth seat finish\u003c\/li\u003e\n\u003cli\u003eStraight-cylindrical 9\/32-inch shank for secure chuck or collet holding\u003c\/li\u003e\n\u003cli\u003eBright, uncoated finish suitable for general-purpose ferrous and non-ferrous machining\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use with number 10 socket-head cap screws. Intended for workpieces with a pre-drilled clearance hole that accepts the 0.221-inch oversize pilot. Compatible with standard drill press chucks and milling machine collets sized for a 9\/32-inch straight shank.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThis tool is installed and operated by machinists using a drill press, mill, or similar machine tool. Secure the straight shank firmly in a chuck or collet before operation and verify the spindle is fully stopped before making any tool changes or adjustments. Use appropriate cutting fluid for the workpiece material to extend tool life and improve finish quality. Always follow shop safety protocols and machine manufacturer guidelines 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: 0.346 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePilot Diameter\u003c\/strong\u003e: 0.221 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePilot Type\u003c\/strong\u003e: Oversize\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 9\/32 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 4.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Forward\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFastener Compatibility\u003c\/strong\u003e: Number 10 Socket-Head Cap Screw\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Cobalt Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Bright\/Uncoated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.14 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: KEO\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 902-000-015\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"KEO","offers":[{"title":"Default Title","offer_id":51972010279218,"sku":"902-000-015","price":78.42,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/b2aac3344ca4bbe04fba22b8bb6bdd15.jpg?v=1789960850","url":"https:\/\/voomisupply.com\/products\/keo-902-000-015-solid-pilot-counterbore-0-346-in-3-flute","provider":"Voomi Supply","version":"1.0","type":"link"}