{"product_id":"hertel-42091-cobalt-jobber-drill-bit-8-mm-135-degree","title":"Hertel 42091 Cobalt Jobber Drill Bit 8 Mm 135 Degree","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe HERTEL 42091 is a cobalt jobber length drill bit designed for drilling through hard and abrasive materials including stainless steel, high-alloy steels, and other tough metals. Built from M35 cobalt steel and finished with an oxide and gold coating, the bit resists heat buildup and wear during high-speed drilling operations. It features a 135-degree split point that reduces walking on contact, a two-flute right-hand spiral configuration for chip evacuation, and a straight cylindrical shank for standard drill chuck compatibility. At 8 mm in diameter and 4.61 inches overall length, it fits standard jobber length applications. Metalworkers, maintenance technicians, and fabricators use this bit for precision drilling in production and field environments.\u003c\/p\u003e\u003cp\u003eThis drill bit is suited for metal fabrication shops, maintenance and repair operations, and industrial production environments where consistent performance in hard metals is required. The 135-degree split point geometry minimizes thrust force and improves hole entry accuracy. The regular spiral flute with a 5xD flute-to-diameter ratio handles chip clearing efficiently in blind and through holes. It is appropriate for use in drill presses, CNC machining centers, and hand-held power drills with compatible chuck sizes.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eM35 cobalt steel construction handles elevated drilling temperatures in hard alloys\u003c\/li\u003e\n\u003cli\u003e135-degree split point reduces walking and lowers required thrust force\u003c\/li\u003e\n\u003cli\u003eOxide and gold coating extends surface hardness and resists corrosion\u003c\/li\u003e\n\u003cli\u003eTwo-flute right-hand spiral promotes consistent chip evacuation\u003c\/li\u003e\n\u003cli\u003eStraight cylindrical shank fits standard drill chucks without adapters\u003c\/li\u003e\n\u003cli\u003e5xD flute-to-diameter ratio balances flute length with core strength\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style jobber length drill bit for use in standard drill chucks accepting 8 mm straight cylindrical shanks, including drill presses, CNC machining centers, and power hand drills.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation of this drill bit is performed by qualified machinists or maintenance technicians familiar with rotating cutting tools. Ensure the drill chuck is fully secured and the workpiece is firmly clamped before operation. Apply cutting fluid appropriate for the workpiece material to reduce heat and extend bit life. Inspect the cutting edges and point geometry for wear before each use and replace the bit if chipping or dulling is observed.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size\u003c\/strong\u003e: 8 mm (0.3150 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 117 mm (4.61 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 75 mm (2.95 inches)\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\u003eNumber of Flutes\u003c\/strong\u003e: 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight Cylindrical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Grade\u003c\/strong\u003e: M35 Cobalt\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Oxide and Gold\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute By Diameter Ratio\u003c\/strong\u003e: 5xD\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: HERTEL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 42091\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51727521284402,"sku":"42091","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/0631941796864ed600c562c42ff2472b.jpg?v=1788678844","url":"https:\/\/voomisupply.com\/products\/hertel-42091-cobalt-jobber-drill-bit-8-mm-135-degree","provider":"Voomi Supply","version":"1.0","type":"link"}