{"product_id":"hertel-18751-countersink-5-16-in-90-degree-4-flute-hss","title":"Hertel 18751 Countersink 5\/16 in 90 Degree 4 Flute Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe HERTEL 18751 is a straight-shank countersink designed for creating clean, chamfered seat profiles in metal, plastic, and composite materials. Built from high-speed steel, this tool offers reliable wear resistance in general-purpose drilling and countersinking operations. The 90-degree included angle suits standard fastener seating requirements across a wide range of applications. With a 5\/16-inch head diameter and a matching 5\/16-inch straight cylindrical shank, it fits securely in standard drill chucks and collet holders. The four-flute configuration improves cutting efficiency and helps reduce chatter during operation, making it a dependable choice for machinists and fabricators working on precision assemblies.\u003c\/p\u003e\n\u003cp\u003eThe HERTEL 18751 is suited for use in machine shops, fabrication facilities, and maintenance environments where consistent countersink geometry is required. It is typically used to prepare holes for flat-head screws, rivets, and similar flush-mount fasteners in ferrous and non-ferrous workpieces. The straight cylindrical shank allows straightforward mounting in standard drill press, lathe, or hand-drill setups. This tool is appropriate for both production runs and one-off maintenance tasks where a reliable, correctly-angled seat is needed.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e5\/16-inch head diameter for compact countersink profiles\u003c\/li\u003e\n  \u003cli\u003e90-degree included angle matches standard flat-head fastener geometry\u003c\/li\u003e\n  \u003cli\u003eFour-flute design improves cutting action and reduces chatter\u003c\/li\u003e\n  \u003cli\u003eHigh-speed steel construction provides good wear resistance in general-purpose applications\u003c\/li\u003e\n  \u003cli\u003eStraight cylindrical shank fits standard drill chucks and collet systems without adapters\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a general-purpose countersink for use in standard drill presses, lathes, and hand-drill setups where a 5\/16-inch straight cylindrical shank is accepted.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eSecure the shank firmly in a drill chuck or collet before operation and confirm runout is within acceptable limits. Apply cutting fluid when working with ferrous metals to extend tool life and improve finish quality. Use appropriate machine guarding and eye protection in accordance with applicable shop safety standards. Inspect the cutting edges before each use and remove the tool from service if chipping or excessive wear is observed.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead Diameter\u003c\/strong\u003e: 5\/16 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 5\/16 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight Cylindrical\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIncluded Angle\u003c\/strong\u003e: 90 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 4\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: High-Speed Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 27112812\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: HERTEL\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 18751\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51755381227826,"sku":"18751","price":84.42,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/2ecc59d76857135d13bfbc4c77359e23.jpg?v=1788954329","url":"https:\/\/voomisupply.com\/products\/hertel-18751-countersink-5-16-in-90-degree-4-flute-hss","provider":"Voomi Supply","version":"1.0","type":"link"}