{"product_id":"chicago-latrobe-70308-drill-bit-letter-h-0-2660-in-hss-tin","title":"Chicago-latrobe 70308 Drill Bit Letter H 0.2660 in Hss Tin","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe CHICAGO-LATROBE 70308 is a jobber-length twist drill bit sized to letter H, equivalent to 0.2660 inches in decimal. Built from high speed steel with a titanium nitride (TiN) coating, it delivers added surface hardness and extended tool life compared to uncoated HSS. The bit features a 118-degree standard point angle, a two-flute regular spiral configuration, and a web-thinned, tapered web for reduced thrust during entry. Overall length is 4.125 inches with a flute length of 2.875 inches. The straight-cylindrical shank measures 0.2660 inches in diameter. This is a general-purpose drill intended for machinists, maintenance technicians, and metalworking tradespeople.\u003c\/p\u003e\n\u003cp\u003eThe 70308 is rated for drilling cast iron and steel in general-purpose applications. Its jobber-length geometry suits bench drill presses, knee mills, and hand-held power drills where standard reach is sufficient. The right-hand spiral flute evacuates chips efficiently in both ferrous and light-alloy materials. It conforms to DIN 338 standards, making it a common replacement or stock bit for job shops, HVAC fabrication, plumbing rough-in, and electrical panel work where precise hole sizing by letter designation is required.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eLetter H size — 0.2660 inches decimal equivalent with a diameter tolerance of -0.0010 to 0.0000 inches\u003c\/li\u003e\n  \u003cli\u003eTitanium nitride (TiN) coating increases surface hardness and reduces friction at the cutting edge\u003c\/li\u003e\n  \u003cli\u003e118-degree standard point angle with web thinning reduces drill thrust and improves centering\u003c\/li\u003e\n  \u003cli\u003eTwo-flute regular spiral design promotes chip clearance in steel and cast iron\u003c\/li\u003e\n  \u003cli\u003eStraight-cylindrical shank fits standard drill chucks without adapter\u003c\/li\u003e\n  \u003cli\u003eConforms to DIN 338 jobber-length standard for consistent dimensional performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a general-purpose jobber-length drill bit for use in steel and cast iron workpieces. Fits any standard drill chuck accepting a 0.2660-inch straight-cylindrical shank.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstall in a drill press, milling machine, or hand drill with a chuck rated for the shank diameter. Secure the workpiece firmly before drilling to prevent movement and bit breakage. Use cutting fluid or coolant when drilling steel to manage heat buildup, as TiN-coated HSS bits are not designed for dry high-speed runs in hard ferrous materials. Inspect the cutting edge before each use and replace if chipping or excessive wear is present.\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: H\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Decimal Inch)\u003c\/strong\u003e: 0.2660 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Diameter Tolerance\u003c\/strong\u003e: -0.0010 to 0.0000 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Point Angle\u003c\/strong\u003e: 118 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 4.125 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 2.875 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.2660 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Length\u003c\/strong\u003e: 1.250 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 2\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Type\u003c\/strong\u003e: Spiral — Regular\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePoint Type\u003c\/strong\u003e: Standard\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeb Configuration\u003c\/strong\u003e: Tapered, Web-Thinned\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: High Speed Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish \/ Coating\u003c\/strong\u003e: Titanium Nitride (TiN)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Material\u003c\/strong\u003e: Cast Iron, Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 150T\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandard\u003c\/strong\u003e: DIN 338\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTool Performance\u003c\/strong\u003e: General Purpose\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.6 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: CHICAGO-LATROBE\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 70308\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CHICAGO-LATROBE","offers":[{"title":"Default Title","offer_id":51732411973938,"sku":"70308","price":17.77,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/ec0e4f85e9f5a7f996310fdeb1705189.jpg?v=1788742511","url":"https:\/\/voomisupply.com\/products\/chicago-latrobe-70308-drill-bit-letter-h-0-2660-in-hss-tin","provider":"Voomi Supply","version":"1.0","type":"link"}