{"product_id":"precision-twist-drill-5997837-no-77-cobalt-jobber-drill","title":"Precision Twist Drill 5997837 No. 77 Cobalt Jobber Drill","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe PRECISION TWIST DRILL 5997837 is a No. 77 wire-size jobber-length drill bit manufactured from cobalt high speed steel with a straw oxide finish. Sized at 0.0180 inches in diameter with a 0.875-inch overall length and a 0.1875-inch flute length, it is built for heavy-duty general-purpose drilling in ferrous and non-ferrous materials. The 135-degree split point and web-thinned tip reduce walking on entry and lower the thrust required to break through the workpiece. Licensed machinists, tool-and-die makers, and field technicians use this bit for precision small-diameter work in steel and other demanding materials.\u003c\/p\u003e\u003cp\u003eThis bit is suited for production and maintenance drilling applications where a wire-gauge No. 77 hole is required. The regular spiral flute geometry and right-hand cutting direction make it compatible with standard drill presses, CNC machining centers, and handheld power drills operating at appropriate spindle speeds for the 0.0180-inch diameter. Primary workpiece materials include steel, cast iron, non-ferrous alloys, and composite materials corresponding to material codes P, M, K, N, and S. The cobalt alloy construction handles elevated cutting temperatures better than standard high speed steel, making it well-suited for harder steel grades and interrupted cuts.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eNo. 77 wire size, 0.0180 inches diameter for precision small-hole drilling\u003c\/li\u003e\n\u003cli\u003eCobalt high speed steel construction for improved heat and wear resistance\u003c\/li\u003e\n\u003cli\u003e135-degree standard split point with web thinning reduces thrust and minimizes walking\u003c\/li\u003e\n\u003cli\u003eStraw oxide finish provides corrosion resistance and reduces friction at the cutting edge\u003c\/li\u003e\n\u003cli\u003eRegular spiral flute with tapered web for reliable chip evacuation\u003c\/li\u003e\n\u003cli\u003eMeets ANSI and NAS 907 standards for dimensional accuracy\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use in the PRECISION TWIST DRILL Series R10CO-R15CO-R18CO and suited as a general-purpose No. 77 wire-size drill bit for any standard straight-shank drill chuck accepting a 0.0180-inch diameter shank.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation of this bit requires a drill chuck rated for the 0.0180-inch straight cylindrical shank diameter. Secure the bit fully in the chuck before operating and verify spindle speed is appropriate for the workpiece material and bit diameter per standard machining tables. Secure the workpiece firmly before drilling to prevent movement during the cut. Inspect the cutting edges for wear or chipping before each use, as cobalt bits used at incorrect speeds or feeds can chip rather than wear gradually.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Wire)\u003c\/strong\u003e: No. 77\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Decimal Inch)\u003c\/strong\u003e: 0.0180 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: Straw Oxide\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\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeb Thinning\u003c\/strong\u003e: Web-Thinned\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeb Configuration\u003c\/strong\u003e: Tapered\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\u003eNumber of Flutes\u003c\/strong\u003e: 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 0.1875 inches (3\/16 inch)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 0.875 inches (7\/8 inch)\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: 0.0180 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Length\u003c\/strong\u003e: 0.6875 inches (11\/16 inch)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Drilling Depth\u003c\/strong\u003e: 0.1875 inches (3\/16 inch)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute by Diameter Ratio\u003c\/strong\u003e: 10xD\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Material\u003c\/strong\u003e: Steel and multi-material (P, M, K, N, S)\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\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\u003eTool Application\u003c\/strong\u003e: Drilling\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTool Performance\u003c\/strong\u003e: General Purpose\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.04167 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\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: 5997837\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PRECISION TWIST DRILL","offers":[{"title":"Default Title","offer_id":51711612617010,"sku":"5997837","price":91.81,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/fd6336b34c1d0261f5eb3b4d3e77059f_ca10219f-deeb-4165-bc62-e064719e7b60.jpg?v=1788477605","url":"https:\/\/voomisupply.com\/products\/precision-twist-drill-5997837-no-77-cobalt-jobber-drill","provider":"Voomi Supply","version":"1.0","type":"link"}