{"product_id":"chicago-latrobe-70318-drill-bit-letter-r-0-3390-in-hss-tin","title":"Chicago-latrobe 70318 Drill Bit Letter R 0.3390 in Hss Tin","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe CHICAGO-LATROBE 70318 is a jobber-length drill bit sized to letter R, equal to 0.3390 inches in diameter, built from high speed steel with a titanium nitride (TiN) coating. It features a 118-degree standard point angle with web thinning on a tapered web for easier penetration and reduced thrust. The straight-cylindrical shank measures 0.3390 inches in diameter and 1.3125 inches in length. At 4.75 inches overall length with a 3.4375-inch flute, this is a general-purpose bit sized for repeated use in production and maintenance drilling. It is installed and used by machinists, pipefitters, and maintenance mechanics working in metal fabrication, HVAC, or plumbing rough-in environments.\u003c\/p\u003e\n\u003cp\u003eThis bit is rated for drilling cast iron and steel and is suited for handheld drill motors, drill presses, and magnetic base drills in both shop and field settings. The right-hand spiral flute promotes chip evacuation during through-hole drilling. The Series 150T designation places it within CHICAGO-LATROBE's general-purpose TiN-coated jobber line, which is commonly stocked by tradespeople for everyday structural and mechanical drilling tasks where a standard twist drill is specified.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eLetter R size: 0.3390 inches diameter for precise hole sizing\u003c\/li\u003e\n  \u003cli\u003eTitanium nitride (TiN) coating increases surface hardness and extends tool life in ferrous materials\u003c\/li\u003e\n  \u003cli\u003e118-degree standard point with web thinning reduces entry thrust and centering effort\u003c\/li\u003e\n  \u003cli\u003eRight-hand spiral flute efficiently clears chips during drilling\u003c\/li\u003e\n  \u003cli\u003eStraight-cylindrical shank fits standard drill chucks without adapters\u003c\/li\u003e\n  \u003cli\u003eMeets DIN 338 standard for jobber-length geometry and tolerances\u003c\/li\u003e\n  \u003cli\u003eDiameter tolerance of -0.0010 to 0.0000 inches ensures consistent hole sizing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a general-purpose jobber-length drill bit compatible with any drill chuck accepting a 0.3390-inch straight-cylindrical shank, including handheld drill motors, drill presses, and magnetic base drills. Primary workpiece materials are cast iron and steel per manufacturer specification.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eSecure the straight-cylindrical shank firmly in a properly sized drill chuck before operation, and confirm the chuck key is removed before powering the drill. Use cutting fluid or coolant when drilling steel at sustained depths to preserve coating life, though this bit is not configured for internal coolant delivery. Always wear eye protection and secure the workpiece before drilling. Dull or chipped cutting edges should not be forced through material; regrinding or replacement is the correct course of action.\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: R\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Decimal Inch)\u003c\/strong\u003e: 0.3390 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: 4.75 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 3.4375 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.3390 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Length\u003c\/strong\u003e: 1.3125 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 2\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpiral Type\u003c\/strong\u003e: Regular\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Type\u003c\/strong\u003e: Spiral\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\u003eDrill Bit Material\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\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\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\u003eDiameter Tolerance\u003c\/strong\u003e: -0.0010 to 0.0000 inches\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: 0.5 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: 70318\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CHICAGO-LATROBE","offers":[{"title":"Default Title","offer_id":51728826499378,"sku":"70318","price":21.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/8056635f34c297fd4b46afdd575b1657.jpg?v=1788696446","url":"https:\/\/voomisupply.com\/products\/chicago-latrobe-70318-drill-bit-letter-r-0-3390-in-hss-tin","provider":"Voomi Supply","version":"1.0","type":"link"}