{"product_id":"hertel-66691619-drill-bit-letter-l-cobalt-tin-135-deg","title":"Hertel 66691619 Drill Bit Letter L Cobalt Tin 135 Deg","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe HERTEL 66691619 is a screw machine length drill bit sized at Letter L (0.290 inches decimal) with a 135-degree split point and a titanium nitride (TiN) coating over a cobalt steel body. Screw machine length bits are shorter than jobber-length bits, which increases rigidity and reduces deflection in production drilling, CNC operations, and close-tolerance work. The split-point geometry starts on contact without a center punch and reduces thrust requirements. The TiN coating adds surface hardness and helps extend tool life when drilling through mild steel, stainless, aluminum, and other ferrous and non-ferrous materials. This bit is rated heavy duty and suited for trade and industrial applications.\u003c\/p\u003e\u003cp\u003eThis drill bit is intended for use in drill presses, CNC machining centers, and hand-held power drills where a shorter, more rigid bit is preferred. The straight cylindrical shank at 0.290 inches fits standard 3-jaw chucks and collet-style toolholders commonly found in machine shop and production environments. The regular spiral flute with web-thinned, parallel web construction supports efficient chip evacuation in through-hole and blind-hole applications. Fabricators, maintenance machinists, and mechanical contractors will find this bit appropriate for general metalworking tasks requiring consistent hole quality.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eLetter L size  -  0.290 inches decimal diameter for precise sizing\u003c\/li\u003e\n\u003cli\u003e135-degree split point starts on contact and reduces thrust force\u003c\/li\u003e\n\u003cli\u003eCobalt steel construction with TiN coating for extended tool life in hard materials\u003c\/li\u003e\n\u003cli\u003eScrew machine (stub) length increases rigidity and reduces deflection\u003c\/li\u003e\n\u003cli\u003eWeb-thinned parallel web supports chip evacuation in metal drilling\u003c\/li\u003e\n\u003cli\u003eRight-hand cutting direction, spiral flute, straight cylindrical shank\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a direct-fit screw machine length drill bit for use in any standard 3-jaw drill chuck or collet toolholder accepting a 0.290-inch straight cylindrical shank.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is performed by qualified machinists or mechanical trade professionals. Secure the shank fully in the chuck or collet and verify runout before drilling. Always power down and lock out the machine before changing tooling. Follow applicable OSHA machine guarding and PPE requirements when operating drilling equipment.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Letter)\u003c\/strong\u003e: L\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Decimal Inch)\u003c\/strong\u003e: 0.290 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTool Material\u003c\/strong\u003e: Cobalt\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: TiN (Titanium Nitride)\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\u003eCutting Direction\u003c\/strong\u003e: Right Hand\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\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.290 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2.75 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 1.5625 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeb Configuration\u003c\/strong\u003e: Parallel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeb Thinning\u003c\/strong\u003e: Web-Thinned\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\u003eWeight\u003c\/strong\u003e: 0.1 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 1\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: 66691619\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51739556512050,"sku":"66691619","price":16.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/968e43b040b68187dee59a7de71573dc.jpg?v=1788816210","url":"https:\/\/voomisupply.com\/products\/hertel-66691619-drill-bit-letter-l-cobalt-tin-135-deg","provider":"Voomi Supply","version":"1.0","type":"link"}