{"product_id":"hertel-18304-countersink-5-16-in-82-deg-6-flute-hss","title":"Hertel 18304 Countersink 5\/16 in 82 Deg 6 Flute Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe HERTEL 18304 is a single-use countersink designed for creating chamfered seat profiles in metal, wood, and composite materials prior to fastener installation. Built from high speed steel (HSS), it delivers consistent cutting performance across a range of substrate hardnesses. The 82-degree included angle matches the standard head geometry for flat-head machine screws and bolts. The 5\/16-inch head diameter and 5\/16-inch straight cylindrical shank make it compatible with standard drill chucks. Six flutes provide smooth, chatter-resistant cutting action and efficient chip evacuation, producing clean, accurate countersink profiles with minimal hand dressing required.\u003c\/p\u003e\n\u003cp\u003eThis countersink is suited for light machining, assembly line prep work, and maintenance applications where flat-head fasteners must sit flush with the workpiece surface. It is a standard-size tool used by machinists, millwrights, and maintenance technicians working with ferrous and non-ferrous metals. The straight cylindrical shank seats directly in drill press chucks, hand drills, or CNC spindles without adapters. It is commonly applied in sheet metal fabrication, equipment repair, and general manufacturing environments requiring precise countersink geometry.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e82-degree included angle matches standard flat-head fastener head geometry\u003c\/li\u003e\n  \u003cli\u003eHigh speed steel construction for durability across a range of materials\u003c\/li\u003e\n  \u003cli\u003e6-flute design reduces chatter and promotes smooth chip clearance\u003c\/li\u003e\n  \u003cli\u003e5\/16-inch straight cylindrical shank fits standard drill chucks without adapters\u003c\/li\u003e\n  \u003cli\u003e5\/16-inch head diameter suitable for light to medium fastener prep work\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a standard straight-shank countersink for use in drill presses, hand drills, and CNC spindles accepting a 5\/16-inch cylindrical shank.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by machinists and maintenance technicians using standard drill equipment. Secure the workpiece before operation and run at a speed appropriate for the substrate material to avoid overheating the cutting edges. Inspect the flutes for wear or damage before use. Do not force the tool into hardened materials beyond the HSS rating.\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\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 Type\u003c\/strong\u003e: Straight Cylindrical\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: 18304\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51749478400306,"sku":"18304","price":81.02,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/f382c4ac007a78617978abfd61b468c9.jpg?v=1788906586","url":"https:\/\/voomisupply.com\/products\/hertel-18304-countersink-5-16-in-82-deg-6-flute-hss","provider":"Voomi Supply","version":"1.0","type":"link"}