{"product_id":"precision-twist-drill-5998146-cobalt-drill-bit-1-64-in","title":"Precision Twist Drill 5998146 Cobalt Drill Bit 1\/64 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe PRECISION TWIST DRILL 5998146 is a cobalt jobber-length drill bit engineered for heavy-duty drilling applications in ferrous and non-ferrous metals. At 1\/64 inch (0.0156 inch) in diameter, this right-hand, two-flute bit features a 135-degree split point that reduces walking on entry and lowers the thrust required to start a hole. The straw oxide and bronze coating adds surface hardness and mild corrosion resistance. With a 3\/4-inch overall length and a 3\/16-inch flute length, this is a purpose-built micro drill intended for precision metalworking tasks where accuracy in tight tolerances is critical.\u003c\/p\u003e\u003cp\u003eThis drill bit is suited for production and maintenance drilling in steel and a broad range of workpiece materials including cast iron, non-ferrous alloys, heat-resistant alloys, and similar metals. Its cobalt construction handles higher cutting temperatures than standard HSS, making it a practical choice for harder steels where conventional bits wear prematurely. Machinists, toolmakers, and trade professionals working with CNC machines, drill presses, or precision hand-held equipment will find this bit appropriate for fine-detail through-hole work. The series designation is R10CO-R15CO-R18CO. The straight shank and standard point geometry make it compatible with standard collets and chucks sized for 1\/64-inch shanks.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eCobalt construction for elevated heat resistance when drilling harder steels\u003c\/li\u003e\n\u003cli\u003e135-degree split point reduces bit walking and lowers entry thrust\u003c\/li\u003e\n\u003cli\u003eStraw oxide and bronze coating provides surface hardness and mild corrosion resistance\u003c\/li\u003e\n\u003cli\u003eWeb-thinned, tapered web design reduces cutting resistance through the full flute depth\u003c\/li\u003e\n\u003cli\u003eMeets ANSI standards and NAS 907 specification\u003c\/li\u003e\n\u003cli\u003eRight-hand, regular spiral flute suitable for general-purpose through-hole drilling\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a general-purpose OEM-style replacement or production drill for use in any standard chuck or collet accepting a 1\/64-inch straight shank. Compatible with material codes P, M, K, N, and S per the input specification, covering steel, stainless, cast iron, non-ferrous metals, and heat-resistant alloys.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is performed by machinists or tool technicians in shop or field environments. Secure the straight shank in a properly sized collet or drill chuck before operation. Always run at appropriate spindle speeds for the workpiece material and bit diameter; micro drill bits are sensitive to side-load and runout, so chuck concentricity is critical. Do not apply excessive feed pressure, which can snap a bit of this diameter.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Diameter\u003c\/strong\u003e: 1\/64 inch (0.0156 inch)\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\u003ePoint Type\u003c\/strong\u003e: Standard Split Point\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Straw Oxide and Bronze\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3\/4 inch (0.750 inch)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 3\/16 inch (0.1875 inch)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 1\/64 inch (0.0156 inch)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Length\u003c\/strong\u003e: 9\/16 inch (0.5625 inch)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight Cylindrical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Type\u003c\/strong\u003e: Regular Spiral\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Drilling Depth\u003c\/strong\u003e: 3\/16 inch (0.1875 inch)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeb Configuration\u003c\/strong\u003e: Tapered, Web-Thinned\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpiral Type\u003c\/strong\u003e: Regular\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Grade\u003c\/strong\u003e: Heavy Duty\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Material\u003c\/strong\u003e: Steel (Material Codes 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\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\u003ePackage Weight\u003c\/strong\u003e: 0.04167 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 1\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: 5998146\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PRECISION TWIST DRILL","offers":[{"title":"Default Title","offer_id":51703005053234,"sku":"5998146","price":89.63,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/48612cbca6d09eb9dfe2c82cf07b8e8a_04dfe597-08b6-4903-9c82-29bd3fbaeaa0.jpg?v=1788414291","url":"https:\/\/voomisupply.com\/products\/precision-twist-drill-5998146-cobalt-drill-bit-1-64-in","provider":"Voomi Supply","version":"1.0","type":"link"}