{"product_id":"precision-twist-drill-5998734-letter-a-hss-jobber-drill-bit","title":"Precision Twist Drill 5998734 Letter a Hss Jobber Drill Bit","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe PRECISION TWIST DRILL 5998734 is a jobber-length twist drill bit sized at Letter A (15\/64 inch, 0.2340 inch decimal), designed for general-purpose drilling in a wide range of materials including steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. The 135-degree split-point geometry reduces walking at startup and cuts through hard materials with less feed pressure than a standard 118-degree point. A steam oxide coating provides light corrosion resistance and improves surface lubricity. The bit is ground from high speed steel (HSS) and is built to heavy-duty grade standards, making it a reliable choice for machinists, maintenance technicians, fabricators, and pipefitters doing production or field drilling work.\u003c\/p\u003e\u003cp\u003eThis drill bit is suited for drilling steel and hard metals in both shop and field environments. The straight-cylindrical shank fits standard three-jaw chucks on drill presses, handheld drills, and CNC drill stations. The regular spiral flute and tapered web configuration promote efficient chip evacuation, which matters when drilling deeper holes in interrupted cuts or tough alloys. At 3.875 inches overall length with a 2.625-inch flute length, it handles depth-to-diameter ratios up to approximately 11xD without extension. Two flutes and a web-thinned point complete the geometry for reduced thrust and cleaner entry.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eLetter A size: 0.2340 inch diameter, equivalent to 15\/64 inch\u003c\/li\u003e\n\u003cli\u003e135-degree split point reduces bit walking and lowers required feed pressure on hard materials\u003c\/li\u003e\n\u003cli\u003eSteam oxide coating improves lubricity and provides light rust resistance\u003c\/li\u003e\n\u003cli\u003eHigh speed steel construction rated for steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium\u003c\/li\u003e\n\u003cli\u003eWeb-thinned tapered web reduces thrust and extends tool life in heavy-duty applications\u003c\/li\u003e\n\u003cli\u003eStraight-cylindrical shank fits standard drill chucks without adapters\u003c\/li\u003e\n\u003cli\u003eMeets ANSI and NAS 907 standards; Series R10B-R15B-R18B\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a direct-fit replacement or standard jobber-length drill bit for any application requiring a Letter A (0.2340 inch) straight-shank twist drill. Fits standard three-jaw drill chucks and is compatible with drill presses, hand drills, and CNC drilling equipment accepting straight-cylindrical shanks of 15\/64 inch diameter.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation and use should be performed by a qualified machinist or technician familiar with rotating cutting tools. Secure the shank fully in the chuck and verify concentricity before drilling. Always wear appropriate eye protection and secure the workpiece before starting the spindle. Do not exceed the recommended cutting speed for the workpiece material, and use cutting fluid when drilling stainless steel, superalloys, or titanium to extend tool life and maintain hole quality.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Letter)\u003c\/strong\u003e: A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Inch)\u003c\/strong\u003e: 15\/64 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Decimal Inch)\u003c\/strong\u003e: 0.2340 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: 3.875 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 2.625 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Drilling Depth\u003c\/strong\u003e: 2.625 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.2340 inches (15\/64 inch)\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: 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\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\u003eDouble Margin\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute by Diameter Ratio\u003c\/strong\u003e: 11xD\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Grade\u003c\/strong\u003e: Heavy Duty\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTool Performance\u003c\/strong\u003e: General Purpose\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\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: 0.19 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: 5998734\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PRECISION TWIST DRILL","offers":[{"title":"Default Title","offer_id":51694717534514,"sku":"5998734","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/630ae9ea750d4f4c3de41855fbe582d7_57f94163-dc0c-4689-bdff-ec393d60de60.jpg?v=1788327631","url":"https:\/\/voomisupply.com\/products\/precision-twist-drill-5998734-letter-a-hss-jobber-drill-bit","provider":"Voomi Supply","version":"1.0","type":"link"}