{"product_id":"precision-twist-drill-5998220-cobalt-jobber-drill-7-16-in","title":"Precision Twist Drill 5998220 Cobalt Jobber Drill 7\/16 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe PRECISION TWIST DRILL 5998220 is a cobalt jobber-length drill bit designed for heavy-duty drilling in steel and other demanding workpiece materials. Built to NAS 907 and ANSI standards, it features a 135-degree split point with web thinning for faster penetration and reduced walking on entry. The straw oxide finish provides added surface hardness and corrosion resistance. At 5.5 inches overall length with a 4.0625-inch flute length, it fits standard drill chucks without adapters. This bit is suited for use by machinists, pipefitters, electricians, and HVAC technicians who need reliable performance drilling through ferrous metals in the field or shop.\u003c\/p\u003e\n\u003cp\u003eThis jobber drill bit is built for general-purpose drilling in steel, cast iron, aluminum, and similar materials. The regular spiral flute with tapered web configuration provides efficient chip evacuation during through-hole and blind-hole operations. The straight cylindrical shank measures 7\/16 inches in diameter, making it compatible with standard keyed and keyless drill chucks. The 9xD flute-to-diameter ratio is consistent with standard jobber-length geometry, appropriate for a wide range of production and maintenance drilling tasks across mechanical, HVAC, plumbing, and electrical trades.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eCobalt construction rated for heavy-duty drilling in ferrous and hard materials\u003c\/li\u003e\n  \u003cli\u003e135-degree split point with web thinning reduces thrust and prevents bit walking\u003c\/li\u003e\n  \u003cli\u003eStraw oxide finish improves surface hardness and extends tool life\u003c\/li\u003e\n  \u003cli\u003eRegular right-hand spiral flute promotes efficient chip removal\u003c\/li\u003e\n  \u003cli\u003eStraight cylindrical shank at 7\/16 inches fits standard drill chucks directly\u003c\/li\u003e\n  \u003cli\u003eMeets NAS 907 and ANSI specifications for consistent dimensional accuracy\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003ePart of the R10CO-R15CO-R18CO series. Designed for general-purpose drilling in steel, cast iron, stainless, aluminum, and similar primary workpiece materials with material codes P, M, K, N, and S. Fits any drill press, hand drill, or magnetic drill motor accepting a 7\/16-inch straight shank.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eSecure the shank firmly in the chuck and verify concentricity before drilling to avoid runout. Always use appropriate cutting fluid or coolant when drilling hardened steel or stainless to prevent heat buildup that can degrade the cobalt cutting edge. Power down and lock out any drill press before changing bits. Follow shop safety protocols and applicable ANSI machining guidelines when operating at high RPM.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Size\u003c\/strong\u003e: 7\/16 inches (0.4375 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Material\u003c\/strong\u003e: Cobalt\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 (Bronze)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 5.5 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 4.0625 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 7\/16 inches (0.4375 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Length\u003c\/strong\u003e: 1.4375 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\u003eMaximum Drilling Depth\u003c\/strong\u003e: 4.0625 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute by Diameter Ratio\u003c\/strong\u003e: 9xD\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandards\u003c\/strong\u003e: NAS 907, ANSI\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Material\u003c\/strong\u003e: Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTool Performance\u003c\/strong\u003e: General Purpose, Heavy Duty\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: 5998220\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PRECISION TWIST DRILL","offers":[{"title":"Default Title","offer_id":51702011658546,"sku":"5998220","price":35.94,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/48612cbca6d09eb9dfe2c82cf07b8e8a_929f4ae5-dbec-4ac4-a1a2-a7f6bebf083e.jpg?v=1788408111","url":"https:\/\/voomisupply.com\/products\/precision-twist-drill-5998220-cobalt-jobber-drill-7-16-in","provider":"Voomi Supply","version":"1.0","type":"link"}