{"product_id":"precision-twist-drill-5998995-cobalt-jobber-drill-bit-letter-b","title":"Precision Twist Drill 5998995 Cobalt Jobber Drill Bit Letter B","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe PRECISION TWIST DRILL 5998995 is a cobalt jobber-length drill bit sized to Letter B (0.2380 inches) with a 135-degree split-point geometry and web-thinned tip. Built from cobalt high-speed steel and finished with an oxide\/bronze straw coating, it is engineered for heavy-duty drilling in ferrous metals, stainless, and high-strength alloys. The two-flute right-hand spiral design promotes chip evacuation during through-hole and blind-hole operations. At 4.0 inches overall length with a 2.75-inch flute, this bit fits standard drill chucks and magnetic-base drill units without modification. It meets ANSI and NAS 907 specifications, making it suitable for aerospace and precision fabrication environments.\u003c\/p\u003e\n\u003cp\u003eThis bit is used in metalworking applications involving steel, cast iron, aluminum, non-ferrous metals, and specialty alloys as indicated by the primary workpiece material codes P, M, K, N, and S. It is a general-purpose heavy-duty tool suited for maintenance technicians, millwrights, pipefitters, and fabrication shops that drill pilot holes, clearance holes, and production runs in structural and sheet metal. The 12xD flute-to-diameter ratio supports moderate drilling depth without step-drilling on most production gauges.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eCobalt HSS construction for improved heat and wear resistance in hard metals\u003c\/li\u003e\n  \u003cli\u003e135-degree split point with web thinning reduces walking and lowers thrust on entry\u003c\/li\u003e\n  \u003cli\u003eOxide\/bronze straw coating extends tool life in abrasive and high-temperature cuts\u003c\/li\u003e\n  \u003cli\u003eRight-hand spiral, regular flute for reliable chip clearance in through and blind holes\u003c\/li\u003e\n  \u003cli\u003eStraight cylindrical shank (0.2380 inches diameter) fits standard 3-jaw drill chucks\u003c\/li\u003e\n  \u003cli\u003eMeets ANSI and NAS 907 standards for dimensional and performance consistency\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement and general-purpose jobber drill for use in any standard drill press, hand drill, or magnetic-base drill accepting a straight-shank bit in the Letter B size range.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation and use of this bit is performed by machinists, maintenance technicians, pipefitters, and fabricators using drill presses, magnetic-base drills, or hand-held power drills. Secure the straight shank fully in a properly sized chuck and tighten all jaws evenly before operation. Always use cutting fluid or coolant when drilling steel and hard alloys to protect both the bit and the workpiece. Inspect the cutting edges for wear before each use and replace the bit if chipping or rounding is observed at the tip.\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: B\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Decimal Inch)\u003c\/strong\u003e: 0.2380 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\u003eCoating\/Finish\u003c\/strong\u003e: Oxide\/Bronze Straw\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\u003eFlute Type\u003c\/strong\u003e: Regular Spiral, 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: 2.75 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Drilling Depth\u003c\/strong\u003e: 2.75 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 4.0 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: 0.2380 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Length\u003c\/strong\u003e: 1.25 inches\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\u003ePrimary Workpiece Material\u003c\/strong\u003e: Steel, Cast Iron, Non-Ferrous, Aluminum, Specialty Alloys (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\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\u003eStandards\u003c\/strong\u003e: ANSI, NAS 907\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: 0.042 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: 5998995\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PRECISION TWIST DRILL","offers":[{"title":"Default Title","offer_id":51722088677682,"sku":"5998995","price":19.7,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/43023b3e6b6bab88a536782a7f7f19eb_db26d2e7-b0bc-4578-887f-4738dd7e6c28.jpg?v=1788585489","url":"https:\/\/voomisupply.com\/products\/precision-twist-drill-5998995-cobalt-jobber-drill-bit-letter-b","provider":"Voomi Supply","version":"1.0","type":"link"}