{"product_id":"hertel-04139317-cobalt-jobber-drill-bit-letter-d","title":"Hertel 04139317 Cobalt Jobber Drill Bit Letter D","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe HERTEL 04139317 is a cobalt jobber-length drill bit sized to letter D (0.2460 inches) with a 135-degree split point and oxide\/gold coating. Cobalt construction provides elevated heat resistance compared to standard high-speed steel, making it well suited for drilling into harder ferrous metals, stainless steel, and high-strength alloys where bit life is a concern. The split-point geometry reduces walking at startup and lowers the thrust force required to feed the bit into the material. Right-hand spiral flutes with regular helix evacuate chips efficiently during through-hole and blind-hole operations. Overall length is 4 inches with a 2.75-inch flute length and a straight-cylindrical shank at 0.2460 inches diameter.\u003c\/p\u003e\n\u003cp\u003eThis bit is intended for holemaking in metalworking applications across manufacturing, maintenance, and fabrication environments. The heavy-duty grade and cobalt material make it appropriate for interrupted cuts, hardened plate, and production drilling where standard HSS bits wear prematurely. The straight-cylindrical shank seats directly in standard drill chucks and collet systems without adapter hardware. It is sold and packaged individually and is a standard jobber-series length compatible with hand-held drills, drill presses, and CNC machining centers operating at appropriate feeds and speeds for cobalt tooling.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eCobalt material for increased heat and wear resistance over standard HSS bits\u003c\/li\u003e\n  \u003cli\u003e135-degree split-point tip reduces walking and lowers required feed pressure\u003c\/li\u003e\n  \u003cli\u003eOxide finish provides additional surface hardness and lubricity\u003c\/li\u003e\n  \u003cli\u003eRight-hand spiral flute with regular helix for efficient chip evacuation\u003c\/li\u003e\n  \u003cli\u003eWeb-thinned, tapered web configuration reduces cutting resistance\u003c\/li\u003e\n  \u003cli\u003eHeavy-duty grade rated for drilling harder ferrous and alloy materials\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a jobber-series replacement drill bit for use in standard drill chucks and collet toolholders accepting a 0.2460-inch straight-cylindrical shank.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eA licensed machinist or qualified metalworking technician should verify correct feeds and speeds for the workpiece material before use, as cobalt bits require different parameters than standard HSS tooling. Secure the workpiece firmly before drilling to prevent movement or rotation. Use appropriate cutting fluid or coolant when drilling through hardened or stainless alloys to extend bit life and maintain dimensional accuracy. Inspect the shank and cutting edges before each use and replace if chipping, excessive wear, or deformation is observed.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Letter)\u003c\/strong\u003e: D\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Decimal Inch)\u003c\/strong\u003e: 0.2460 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Material\u003c\/strong\u003e: Cobalt\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Oxide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Point Angle\u003c\/strong\u003e: 135 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePoint Type\u003c\/strong\u003e: Split\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Type\u003c\/strong\u003e: Spiral\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpiral Type\u003c\/strong\u003e: Regular\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 2.75 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 4 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.2460 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeb Configuration\u003c\/strong\u003e: Tapered, Web-Thinned\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: Jobber\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Grade\u003c\/strong\u003e: Heavy Duty\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDouble Margin\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.01 pounds\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: 04139317\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51735015031090,"sku":"04139317","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/660275fdbe1939079469483280edcd6e.jpg?v=1788769219","url":"https:\/\/voomisupply.com\/products\/hertel-04139317-cobalt-jobber-drill-bit-letter-d","provider":"Voomi Supply","version":"1.0","type":"link"}