{"product_id":"precision-twist-drill-5999136-jobber-drill-bit-letter-u-hss","title":"Precision Twist Drill 5999136 Jobber Drill Bit Letter U Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe PRECISION TWIST DRILL 5999136 is a jobber-length drill bit sized to Letter U (0.3680 inches decimal equivalent), designed for general-purpose drilling in demanding trade and industrial applications. Built from high speed steel with a steam oxide coating, this bit runs a 135-degree split point that reduces walking on entry and lowers thrust requirements compared to a conventional 118-degree point. The straight-cylindrical shank seats securely in standard three-jaw chucks, and the two-flute regular spiral geometry evacuates chips efficiently through a 3.625-inch flute length. Overall length is 5 inches. Web thinning on the tapered web further reduces cutting resistance. This is a heavy-duty grade bit suited for production and maintenance drilling alike.\u003c\/p\u003e\u003cp\u003eThis bit is rated for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium, covering the ISO material groups P, M, K, N, and S. That range makes it a practical single-bit choice for HVAC techs drilling sheet metal and structural steel, plumbers drilling cast iron and copper-bearing fixtures, electricians drilling panel knockouts and unistrut, and general maintenance trades working across mixed-material environments. Maximum drilling depth matches the flute length at 3.625 inches. Series designation covers R10B, R15B, and R18B. Conforms to ANSI and NAS 907 standards.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eLetter U size: 0.3680 inches decimal equivalent for precise hole sizing\u003c\/li\u003e\n\u003cli\u003e135-degree split point reduces walking and lowers feed pressure at entry\u003c\/li\u003e\n\u003cli\u003eHigh speed steel construction with steam oxide coating for lubricity and corrosion resistance\u003c\/li\u003e\n\u003cli\u003eWeb-thinned tapered web reduces cutting torque and extends bit life\u003c\/li\u003e\n\u003cli\u003eTwo-flute regular spiral with 3.625-inch flute length for effective chip evacuation\u003c\/li\u003e\n\u003cli\u003eStraight-cylindrical shank fits standard drill chucks without adapters\u003c\/li\u003e\n\u003cli\u003eConforms to ANSI and NAS 907 specifications for dimensional accuracy\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a general-purpose jobber-length drill bit compatible with any standard three-jaw drill chuck accepting a 0.3680-inch straight-cylindrical shank, including benchtop drill presses, hand drills, and right-angle drill attachments used across HVAC, plumbing, electrical, and mechanical trades.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eA licensed or experienced tradesperson should secure the bit fully into the chuck and verify runout before drilling. Always wear eye protection and appropriate gloves when operating drill equipment. Use cutting fluid or coolant when drilling stainless steel, superalloys, or titanium to manage heat buildup and extend bit life. Power down the drill and allow the bit to fully stop before changing bits or clearing chip buildup from the flutes.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Letter)\u003c\/strong\u003e: U\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Decimal Inch)\u003c\/strong\u003e: 0.3680 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\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\u003eOverall Length\u003c\/strong\u003e: 5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 3.625 inches (3-5\/8 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Drilling Depth\u003c\/strong\u003e: 3.625 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.3680 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Length\u003c\/strong\u003e: 1.375 inches (1-3\/8 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\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpiral Type\u003c\/strong\u003e: 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\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeb Thinning\u003c\/strong\u003e: Web-Thinned\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePoint Type\u003c\/strong\u003e: Standard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTool Performance\u003c\/strong\u003e: General Purpose\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Grade\u003c\/strong\u003e: Heavy Duty\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute by Diameter Ratio\u003c\/strong\u003e: 10xD\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flats\u003c\/strong\u003e: 0\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Materials\u003c\/strong\u003e: Steel, Stainless Steel, Cast Iron, Non-Ferrous Metal, Superalloys and Titanium, Hard Material\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: R10B, R15B, R18B\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards\u003c\/strong\u003e: ANSI, NAS 907\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.18 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: 5999136\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PRECISION TWIST DRILL","offers":[{"title":"Default Title","offer_id":51720552677682,"sku":"5999136","price":22.62,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/630ae9ea750d4f4c3de41855fbe582d7_e95e40d2-d405-402b-95c3-0795d60ea50b.jpg?v=1788565994","url":"https:\/\/voomisupply.com\/products\/precision-twist-drill-5999136-jobber-drill-bit-letter-u-hss","provider":"Voomi Supply","version":"1.0","type":"link"}