{"product_id":"precision-twist-drill-5998660-drill-bit-letter-e-1-4-in","title":"Precision Twist Drill 5998660 Drill Bit Letter E 1\/4 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe PRECISION TWIST DRILL 5998660 is a jobber length drill bit sized to Letter E (0.2500 inches) with a 118-degree standard point angle. It is made from high speed steel with a steam oxide coating that reduces friction and extends tool life in production drilling environments. The bit features a two-flute regular spiral design with a straight-cylindrical shank, a 2.75-inch flute length, and a 4-inch overall length. This is a general purpose drill intended for use by machinists, maintenance technicians, and metalworking tradespeople who need a reliable, ANSI-compliant jobber bit for everyday metal drilling tasks.\u003c\/p\u003e\n\u003cp\u003eThe 5998660 is suited for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium in both production and maintenance-repair-operations contexts. Its 11xD flute-to-diameter ratio provides adequate chip clearance for moderate-depth drilling. The straight-cylindrical shank fits standard drill chucks found on benchtop drill presses, handheld drills, and CNC machines with appropriate toolholding. The Series R10 designation places this bit within PRECISION TWIST DRILL's general purpose jobber line, designed for common hole-making applications where coolant-through tooling is not required.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eLetter E size: 0.2500-inch diameter with a diameter tolerance of -0.0007 to 0.0000 inches\u003c\/li\u003e\n  \u003cli\u003e118-degree standard point angle with web-thinned, tapered web configuration for easier starting\u003c\/li\u003e\n  \u003cli\u003eHigh speed steel construction with steam oxide coating to reduce friction and inhibit corrosion\u003c\/li\u003e\n  \u003cli\u003e2-flute regular spiral design with a 2.75-inch maximum drilling depth\u003c\/li\u003e\n  \u003cli\u003eStraight-cylindrical shank at 0.2500-inch diameter, 1.25 inches in length, with no flats\u003c\/li\u003e\n  \u003cli\u003eANSI-compliant general purpose grade suitable for a wide range of workpiece materials\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. Compatible with any standard drill chuck accepting a 0.2500-inch straight-cylindrical shank. Series designation covers R10, R15, and R18 product families within the PRECISION TWIST DRILL general purpose jobber line.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThis bit is installed and operated by machinists, maintenance technicians, and general metalworking tradespeople. Secure the shank fully in the drill chuck and verify there is no runout before beginning a cut. Coolant-through is not supported on this bit; apply cutting fluid externally when drilling hard or heat-sensitive materials. Inspect the cutting edges for wear before each use and replace the bit 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: E\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Inch)\u003c\/strong\u003e: 1\/4 inch (0.2500 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\u003eMaterial\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: 4 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 2.75 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Drilling Depth\u003c\/strong\u003e: 2.75 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.2500 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Length\u003c\/strong\u003e: 1.25 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: Regular Spiral\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\u003ePoint Type\u003c\/strong\u003e: Standard\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: -0.0007 to 0.0000 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute by Diameter Ratio\u003c\/strong\u003e: 11xD\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: R10-R15-R18\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandards\u003c\/strong\u003e: ANSI\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: 0.04167 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: PRECISION TWIST DRILL\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 5998660\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PRECISION TWIST DRILL","offers":[{"title":"Default Title","offer_id":51709880893746,"sku":"5998660","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/8285143b76113f15c5f987c3a55f96e2_8051bda2-6513-463b-9386-201c06e18c10.jpg?v=1788461782","url":"https:\/\/voomisupply.com\/products\/precision-twist-drill-5998660-drill-bit-letter-e-1-4-in","provider":"Voomi Supply","version":"1.0","type":"link"}