{"product_id":"precision-twist-drill-5997845-cobalt-jobber-drill-no-8","title":"Precision Twist Drill 5997845 Cobalt Jobber Drill No 8","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe PRECISION TWIST DRILL 5997845 is a No. 8 wire-size cobalt jobber-length drill bit built for production and maintenance drilling in steel and other demanding workpiece materials. It measures 0.1990 inches in diameter with a 135-degree split point and a web-thinned, tapered-web geometry that reduces entry force and centers the bit without a pilot hole. Overall length is 3.625 inches with a 2.4375-inch flute length. The straw oxide finish provides baseline lubricity and heat resistance. This is a two-flute, right-hand-cut tool ground to NAS 907 and ANSI standards, suited for machinists, maintenance technicians, and fabricators working in metal-cutting applications.\u003c\/p\u003e\n\u003cp\u003eThis cobalt jobber drill is intended for drilling steel, stainless, cast iron, nonferrous alloys, and high-temp alloys — workpiece material codes P, M, K, N, and S. The 12xD flute-to-diameter ratio and straight cylindrical shank make it compatible with standard drill chucks and collet holders on bench drills, drill presses, CNC machining centers, and hand-held power drills. It belongs to the R10CO-R15CO-R18CO series, which covers heavy-duty cobalt jobber drills in this size range. Typical applications include structural fabrication, machine shops, and field maintenance where higher heat resistance than standard HSS is required.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eCobalt high-speed steel construction resists heat buildup when drilling harder steels and alloys\u003c\/li\u003e\n  \u003cli\u003e135-degree split point with web thinning reduces thrust force and improves self-centering\u003c\/li\u003e\n  \u003cli\u003eStraw oxide finish adds surface lubricity and corrosion resistance\u003c\/li\u003e\n  \u003cli\u003eRight-hand spiral flute evacuates chips efficiently in through-hole and blind-hole drilling\u003c\/li\u003e\n  \u003cli\u003eStraight cylindrical shank fits standard 3-jaw chucks and collet systems without an adapter\u003c\/li\u003e\n  \u003cli\u003eGround to NAS 907 and ANSI standards for dimensional consistency across the series\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003ePart of the PRECISION TWIST DRILL R10CO-R15CO-R18CO cobalt jobber series. Fits any drill chuck or collet accepting a 0.1990-inch straight shank. Rated for workpiece material codes P, M, K, N, and S per the supplier specification.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eSecure the shank fully in the chuck and verify concentricity before drilling to minimize runout and premature wear. Use cutting fluid or coolant when drilling steel or stainless to extend tool life; coolant-through is not supported by this tool. Operate at manufacturer-recommended surface footage for cobalt tooling in the target material — excessive speed generates heat that degrades the cutting edge. Inspect the point for chipping or wear before each use and recondition on a drill grinder when required.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Wire)\u003c\/strong\u003e: No. 8\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Decimal Inch)\u003c\/strong\u003e: 0.1990 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Material\u003c\/strong\u003e: Cobalt High-Speed Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Grade\u003c\/strong\u003e: Heavy Duty\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Point Angle\u003c\/strong\u003e: 135 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePoint Type\u003c\/strong\u003e: Standard Split Point, Web-Thinned\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Straw Oxide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Type\u003c\/strong\u003e: Regular Spiral\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 2\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 2.4375 inches (2-7\/16 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Drilling Depth\u003c\/strong\u003e: 2.4375 inches (2-7\/16 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3.625 inches (3-5\/8 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.1990 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Length\u003c\/strong\u003e: 1.1875 inches (1-3\/16 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight Cylindrical\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeb Configuration\u003c\/strong\u003e: Tapered\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute by Diameter Ratio\u003c\/strong\u003e: 12xD\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\u003ePrimary Workpiece Material\u003c\/strong\u003e: Steel (P, M, K, N, S)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandards\u003c\/strong\u003e: NAS 907, ANSI\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: R10CO-R15CO-R18CO\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: 5997845\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PRECISION TWIST DRILL","offers":[{"title":"Default Title","offer_id":51694359347506,"sku":"5997845","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/fd6336b34c1d0261f5eb3b4d3e77059f_6e32c4cd-7e9a-458a-948d-ffaa24e6bc96.jpg?v=1788323590","url":"https:\/\/voomisupply.com\/products\/precision-twist-drill-5997845-cobalt-jobber-drill-no-8","provider":"Voomi Supply","version":"1.0","type":"link"}