{"product_id":"precision-twist-drill-5998209-cobalt-jobber-drill-5-16-in","title":"Precision Twist Drill 5998209 Cobalt Jobber Drill 5\/16 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe PRECISION TWIST DRILL 5998209 is a cobalt jobber-length drill bit designed for production and maintenance drilling in steel and other demanding workpiece materials. It features a 5\/16-inch diameter, a 135-degree split point with web thinning for reduced thrust and self-centering starts, and a straw oxide finish that provides surface hardness and mild lubricity. The straight cylindrical shank seats in standard three-jaw chucks. With a 4.5-inch overall length and a 3.1875-inch flute length, this bit handles depths up to 3-3\/16 inches in a single pass. It is suited for trade professionals, machinists, and maintenance technicians working with steel fabrication and repair applications.\u003c\/p\u003e\n\u003cp\u003eThis drill bit is built for general-purpose metal drilling in ferrous and non-ferrous materials, including carbon steel, alloy steel, cast iron, aluminum, and non-metallic workpieces as indicated by its material codes. The regular spiral flute provides efficient chip evacuation during right-hand rotation. It is a practical choice for HVAC equipment fabrication, electrical panel work, plumbing support installations, and general structural drilling where cobalt-grade performance in steel is required without coolant-through capability.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eCobalt high-speed steel construction provides heat resistance and extended tool life in steel drilling\u003c\/li\u003e\n  \u003cli\u003e135-degree split point with web thinning reduces walking and lowers feed force at entry\u003c\/li\u003e\n  \u003cli\u003eStraw oxide finish adds surface hardness and mild lubrication during cutting\u003c\/li\u003e\n  \u003cli\u003eRegular spiral flute with tapered web design promotes consistent chip evacuation\u003c\/li\u003e\n  \u003cli\u003eStraight cylindrical shank fits standard drill chucks without adapters\u003c\/li\u003e\n  \u003cli\u003eMeets NAS 907 and ANSI standards for jobber drill geometry and dimensional consistency\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style general-purpose jobber drill for use in standard three-jaw drill chucks and drill press spindles accepting a 5\/16-inch straight shank. Part of the PRECISION TWIST DRILL Series R10CO-R15CO-R18CO cobalt drill line. Compatible with primary workpiece material codes P, M, K, N, and S covering steel, stainless, cast iron, non-ferrous, and high-temperature alloys.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation and use of this drill bit is performed by machinists, maintenance technicians, and trade professionals operating handheld or stationary drilling equipment. Always secure the workpiece before drilling and confirm chuck jaws are fully tightened on the straight shank. Wear appropriate eye protection and follow shop-specific machine guarding requirements. Coolant through is not supported on this bit; apply cutting fluid externally when drilling in steel to extend tool life.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Diameter\u003c\/strong\u003e: 5\/16 inches (0.3125 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\u003ePoint Angle\u003c\/strong\u003e: 135 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Straw Oxide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 4.5 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 3.1875 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Drilling Depth\u003c\/strong\u003e: 3.1875 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.3125 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Length\u003c\/strong\u003e: 1.3125 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\u003eSpiral Type\u003c\/strong\u003e: Regular\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\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePoint Type\u003c\/strong\u003e: Standard Split Point\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\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\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: R10CO-R15CO-R18CO\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandards\u003c\/strong\u003e: NAS 907, ANSI\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpecification Designation\u003c\/strong\u003e: NAS\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 23241634\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.083 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: 5998209\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PRECISION TWIST DRILL","offers":[{"title":"Default Title","offer_id":51696295805234,"sku":"5998209","price":21.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/48612cbca6d09eb9dfe2c82cf07b8e8a_799bd064-eb59-4b86-ad3d-e870ae55c906.jpg?v=1788341123","url":"https:\/\/voomisupply.com\/products\/precision-twist-drill-5998209-cobalt-jobber-drill-5-16-in","provider":"Voomi Supply","version":"1.0","type":"link"}