{"product_id":"precision-twist-drill-5999347-jobber-drill-bit-letter-r","title":"Precision Twist Drill 5999347 Jobber Drill Bit Letter R","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe PRECISION TWIST DRILL 5999347 is a jobber-length drill bit sized to letter R (0.3390 inches decimal equivalent), designed for general-purpose drilling in metal and hard materials. Built from high speed steel with a steam oxide coating, it runs a standard 118-degree point angle with a web-thinned, tapered web for improved chip clearance at entry. Overall length is 4.75 inches with a flute length of 3.4375 inches, giving it the reach typical for through-hole and deep-feature work in production and maintenance drilling. Licensed HVAC techs, machinists, pipefitters, and general trade professionals reach for this size when drilling pilot holes, clearance holes, and tap-drill applications across a wide range of base metals.\u003c\/p\u003e\u003cp\u003eThis bit is suited for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. It fits standard drill chucks via its straight-cylindrical shank (0.3390 inches diameter, 1.3125 inches shank length). The right-hand spiral flute and regular spiral type make it compatible with conventional drill presses, hand drills, and CNC drilling setups in both shop and field environments. Maximum drilling depth reaches 3.4375 inches, aligning with the 10xD flute-to-diameter ratio of the R10-R15-R18 series.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eLetter R size — 0.3390 inches decimal equivalent for precise hole sizing\u003c\/li\u003e\n\u003cli\u003e118-degree standard point angle with web thinning for reduced thrust and cleaner entry\u003c\/li\u003e\n\u003cli\u003eSteam oxide coating improves lubricity and provides basic corrosion resistance during storage and use\u003c\/li\u003e\n\u003cli\u003eHigh speed steel construction handles steel, stainless, cast iron, non-ferrous metals, and superalloys\u003c\/li\u003e\n\u003cli\u003eStraight-cylindrical shank fits standard 3-jaw drill chucks without adapters\u003c\/li\u003e\n\u003cli\u003e2-flute right-hand spiral design promotes efficient chip evacuation in through-hole drilling\u003c\/li\u003e\n\u003cli\u003eConforms to ANSI standards for jobber-length drill bits\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a general-purpose jobber-length drill bit conforming to ANSI standards, compatible with any standard drill chuck accepting a 0.3390-inch straight shank. Suitable for use in drill presses, hand drills, and CNC drilling equipment across production, maintenance, and field applications.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstall in a properly sized drill chuck and tighten securely before operation. Secure the workpiece with a vise or clamp — never hand-hold metal stock during drilling. Apply cutting fluid when drilling stainless steel, superalloys, or titanium to manage heat and extend bit life. Replace the bit if the cutting edges show visible wear, chipping, or if the bit begins to wander at entry.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\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\u003eOverall Length\u003c\/strong\u003e: 4.75 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 3.4375 inches (3-7\/16 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Length\u003c\/strong\u003e: 1.3125 inches (1-5\/16 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 Type\u003c\/strong\u003e: Straight-Cylindrical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Point Angle\u003c\/strong\u003e: 118 degrees\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\u003eWeb Configuration\u003c\/strong\u003e: Tapered, Web-Thinned\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\u003eCoating\/Finish\u003c\/strong\u003e: Steam Oxide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Drilling Depth\u003c\/strong\u003e: 3.4375 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Material\u003c\/strong\u003e: Steel, Stainless Steel, Cast Iron, Non-Ferrous Metal, Superalloys and Titanium, Hard Material\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: R10-R15-R18\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTool Performance\u003c\/strong\u003e: General Purpose\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard\u003c\/strong\u003e: ANSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.083 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: PRECISION TWIST DRILL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 5999347\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PRECISION TWIST DRILL","offers":[{"title":"Default Title","offer_id":51714387935538,"sku":"5999347","price":18.42,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/0d1376067efa74e57cf29a3e46baef9d_eff664bd-689d-45f9-ae41-5f150bc243c5.jpg?v=1788500728","url":"https:\/\/voomisupply.com\/products\/precision-twist-drill-5999347-jobber-drill-bit-letter-r","provider":"Voomi Supply","version":"1.0","type":"link"}