{"product_id":"precision-twist-drill-5999078-cobalt-jobber-drill-bit-w","title":"Precision Twist Drill 5999078 Cobalt Jobber Drill Bit W","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe PRECISION TWIST DRILL 5999078 is a cobalt jobber-length drill bit sized to Letter W (0.3860 inches) with a 135-degree split-point geometry. The web-thinned, tapered-web construction reduces thrust at the point and improves chip evacuation. An oxide and straw coating provides surface hardness and mild lubricity for drilling into steel and other ferrous and non-ferrous materials. The straight cylindrical shank measures 0.3860 inches in diameter and 1.375 inches in length, fitting standard three-jaw drill chucks without adapters. This bit is designed for general-purpose heavy-duty production and maintenance drilling performed by machinists, pipefitters, ironworkers, and industrial maintenance technicians.\u003c\/p\u003e\n\u003cp\u003eThis drill bit is suited for use in ferrous steels, stainless steels, cast irons, non-ferrous metals, and high-temperature alloys, consistent with Primary Workpiece Material Codes P, M, K, N, and S. It fits bench drill presses, magnetic drill presses, CNC machining centers, and hand-held right-angle drills equipped with a chuck accepting a 0.3860-inch straight shank. The regular spiral flute with a 10xD flute-to-diameter ratio allows a maximum drilling depth of 3.750 inches, making this bit appropriate for through-holes and moderate-depth blind holes in structural steel, plate, pipe, and fabricated assemblies.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eCobalt high-speed steel construction for elevated heat resistance during continuous drilling in steel and alloys\u003c\/li\u003e\n  \u003cli\u003e135-degree split point with web thinning reduces walking and lowers required thrust force\u003c\/li\u003e\n  \u003cli\u003eOxide and straw coating provides surface hardness and mild corrosion resistance\u003c\/li\u003e\n  \u003cli\u003eRegular spiral flute at 10xD ratio supports chip clearance to a maximum depth of 3.750 inches\u003c\/li\u003e\n  \u003cli\u003eStraight cylindrical shank fits standard three-jaw chucks without requiring a reducer or adapter\u003c\/li\u003e\n  \u003cli\u003eMeets ANSI and NAS 907 specifications for dimensional and performance consistency\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a general-purpose jobber drill for use in right-hand rotating drill chucks across drill presses, CNC machining centers, and portable drills accepting a straight shank; part of the R10CO-R15CO-R18CO series from PRECISION TWIST DRILL.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by machinists or qualified maintenance technicians using a keyed or keyless three-jaw chuck. Secure the shank fully into the chuck jaws before engaging the spindle. Use cutting fluid or coolant appropriate to the workpiece material to prolong cutting edge life; this bit does not support internal coolant-through delivery. Inspect the cutting edges and web for wear or chipping before each use and replace if edge integrity is compromised.\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: W\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Decimal Inch)\u003c\/strong\u003e: 0.3860 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 Point Angle\u003c\/strong\u003e: 135 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePoint Type\u003c\/strong\u003e: Standard Web-Thinned\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Oxide and Straw\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\u003eCutting Direction\u003c\/strong\u003e: Right Hand\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: 3.750 inches (3-3\/4 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Drilling Depth\u003c\/strong\u003e: 3.750 inches (3-3\/4 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 5.125 inches (5-1\/8 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight Cylindrical\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.3860 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Length\u003c\/strong\u003e: 1.375 inches (1-3\/8 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeb Configuration\u003c\/strong\u003e: Tapered\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Material\u003c\/strong\u003e: Steel (Codes P, M, K, N, S)\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\u003eSeries\u003c\/strong\u003e: R10CO-R15CO-R18CO\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandards\u003c\/strong\u003e: ANSI, NAS 907\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: 5999078\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PRECISION TWIST DRILL","offers":[{"title":"Default Title","offer_id":51694225064242,"sku":"5999078","price":35.03,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/43023b3e6b6bab88a536782a7f7f19eb_09e2f5ab-93d0-47da-97c2-e7dd789da07e.jpg?v=1788321868","url":"https:\/\/voomisupply.com\/products\/precision-twist-drill-5999078-cobalt-jobber-drill-bit-w","provider":"Voomi Supply","version":"1.0","type":"link"}