{"product_id":"hertel-66692435-jobber-drill-bit-letter-e-hss-tialn","title":"Hertel 66692435 Jobber Drill Bit Letter E Hss Tialn","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe HERTEL 66692435 is a Letter E jobber-length drill bit designed for general-purpose holemaking in metal and other hard materials. It features a 135-degree split point that reduces walking and requires no center punch on most surfaces. The TiAlN coating improves surface hardness and heat resistance, extending tool life in production drilling applications. The bit is manufactured from high speed steel and includes a web-thinned, tapered web configuration that lowers thrust and improves chip evacuation. With a 4-inch overall length and 2-3\/4-inch flute length, it fits standard drill chucks and is appropriate for use in hand drills, drill presses, and CNC machines. Licensed machinists, tool-and-die workers, millwrights, and maintenance technicians are the typical end users.\u003c\/p\u003e\u003cp\u003eThis drill bit is suited for drilling through mild steel, aluminum, cast iron, and similar materials in both shop and field environments. The straight cylindrical shank accepts standard three-jaw drill chucks without modification. Its heavy-duty grade designation and NAS specification make it appropriate for aerospace and industrial maintenance applications where dimensional consistency and surface finish are important. The 0.2500-inch decimal diameter corresponds to a Letter E size, making it a common choice for tapping and reaming operations that require precise pre-drill sizing.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e135-degree split point reduces drill walking and lowers required feed pressure\u003c\/li\u003e\n\u003cli\u003eTiAlN coating increases surface hardness and thermal resistance for extended tool life\u003c\/li\u003e\n\u003cli\u003eWeb-thinned tapered web reduces axial thrust and improves chip flow\u003c\/li\u003e\n\u003cli\u003eRegular spiral flute with right-hand cutting direction for standard drill press and hand drill use\u003c\/li\u003e\n\u003cli\u003eNAS specification designation for consistent dimensional tolerances\u003c\/li\u003e\n\u003cli\u003eHeavy-duty grade construction rated for production and repeat-cycle drilling\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a standard Letter E jobber drill bit with a 0.2500-inch straight cylindrical shank, compatible with any three-jaw drill chuck accepting that shank diameter. Suitable for use in hand drills, benchtop drill presses, and CNC machining centers.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is performed by machinists or maintenance technicians using a standard drill chuck and key. Secure the shank fully in the chuck and verify concentricity before drilling. Ensure the workpiece is clamped or fixtured before engaging the bit to prevent rotation and injury. Follow applicable shop safety procedures including eye protection and appropriate feed rates for the material being drilled.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Letter)\u003c\/strong\u003e: E\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Decimal Inch)\u003c\/strong\u003e: 0.2500 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, Regular\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 2-3\/4 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 Type\u003c\/strong\u003e: Straight-Cylindrical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.2500 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: High Speed Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: TiAlN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeb Configuration\u003c\/strong\u003e: Tapered, Web-Thinned\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\u003eGrade\u003c\/strong\u003e: Heavy Duty\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecification Designation\u003c\/strong\u003e: NAS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: Jobber\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.12 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: 66692435\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51743892734258,"sku":"66692435","price":17.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/153ef4727c075c43239aea8d4cef69f2.jpg?v=1788850944","url":"https:\/\/voomisupply.com\/products\/hertel-66692435-jobber-drill-bit-letter-e-hss-tialn","provider":"Voomi Supply","version":"1.0","type":"link"}