{"product_id":"hertel-18551-countersink-1-in-82-degree-6-flute-hss","title":"Hertel 18551 Countersink 1 in 82 Degree 6 Flute Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe HERTEL 18551 is a high speed steel countersink designed for producing chamfered recesses in metal, plastic, and composite workpieces. With a 1 inch head diameter and an 82-degree included angle, it creates the precise seat geometry required for flat-head fasteners in aerospace, general machining, and fabrication applications. The 6-flute design distributes cutting load evenly, reducing chatter and improving finish quality in both hand-feed and machine-feed operations. The straight cylindrical shank measures 0.5 inches in diameter, allowing it to seat securely in standard drill chucks and collet holders used in drill presses, lathes, and milling machines.\u003c\/p\u003e\u003cp\u003eThis countersink is suited for use in machine shops, maintenance facilities, and production environments where consistent chamfer geometry is required. The 82-degree angle matches the industry-standard fastener seat for flat-head machine screws and aerospace-spec hardware. It is intended for use by machinists and tool-and-die professionals working with ferrous and non-ferrous materials. The high speed steel construction handles moderate cutting speeds without requiring carbide tooling upgrades in most general-purpose applications.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e1 inch head diameter for large-diameter chamfer work\u003c\/li\u003e\n\u003cli\u003e82-degree included angle matches flat-head fastener seat geometry\u003c\/li\u003e\n\u003cli\u003e6 flutes for reduced chatter and improved surface finish\u003c\/li\u003e\n\u003cli\u003eStraight cylindrical shank at 0.5 inches diameter fits standard chucks and collets\u003c\/li\u003e\n\u003cli\u003eHigh speed steel construction provides toughness across a range of workpiece materials\u003c\/li\u003e\n\u003cli\u003eTip diameter of 0.203 inches ensures clean entry point initiation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a direct-fit countersink for standard drill presses, milling machines, and lathes accepting a 0.5 inch straight cylindrical shank. Compatible with drill chucks and ER collet systems sized for 0.5 inch tooling.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation and use should be performed by qualified machinists familiar with rotary cutting tool safety. Secure the shank fully in the chuck or collet before operation and confirm runout is within acceptable tolerance for the application. Power down and lock out the machine before changing or adjusting the tool. Do not exceed the recommended cutting speed range for high speed steel tooling in the workpiece material being machined.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Diameter\u003c\/strong\u003e: 1 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Angle\u003c\/strong\u003e: 82 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 6\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight Cylindrical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTip Diameter\u003c\/strong\u003e: 0.203 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: High Speed Steel\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\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: 18551\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51730484986162,"sku":"18551","price":172.91,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/4d6eadfeb2f2cde6890f6d5942a3700d.jpg?v=1788718297","url":"https:\/\/voomisupply.com\/products\/hertel-18551-countersink-1-in-82-degree-6-flute-hss","provider":"Voomi Supply","version":"1.0","type":"link"}