{"product_id":"precision-twist-drill-5995507-cobalt-extension-drill-bit","title":"Precision Twist Drill 5995507 Cobalt Extension Drill Bit","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe PRECISION TWIST DRILL 5995507 is a cobalt aircraft extension drill bit designed for drilling in tough materials including hardened steels, stainless steel, and high-temperature alloys. Built to NAS 907 Type J standards, this bit features a 135-degree split point that is self-centering, reducing the need for a center punch and minimizing walking on entry. The straw finish indicates heat treatment consistent with cobalt tooling. With a wire gauge size of No. 8 and a decimal diameter of 0.199 inches, it delivers precise hole sizing for aerospace-style and general metalworking applications. Licensed tradespeople and machinists in HVAC, fabrication, and maintenance fields rely on this bit for accurate, repeatable results in demanding materials.\u003c\/p\u003e\u003cp\u003eThis drill bit suits applications requiring extended reach beyond what a standard-length bit provides. The 2.4375-inch flute length and 6-inch overall length make it appropriate for drilling through thicker workpieces or in confined areas where standard jobber bits cannot reach. The straight-cylindrical shank at 0.199 inches diameter fits standard drill chucks without adapters. General-purpose performance covers structural steel, sheet metal stacks, and similar substrates common in commercial HVAC installation, electrical rough-in, and plumbing rough-in work.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e135-degree split point is self-centering for accurate hole starts without center punching\u003c\/li\u003e\n\u003cli\u003eCobalt construction with straw finish provides increased heat and wear resistance over standard HSS bits\u003c\/li\u003e\n\u003cli\u003eExtended 6-inch overall length allows drilling in deep or hard-to-reach locations\u003c\/li\u003e\n\u003cli\u003eTwo-flute spiral design with web-thinned, tapered web for efficient chip evacuation\u003c\/li\u003e\n\u003cli\u003eRight-hand cutting direction compatible with standard drill drivers and drill presses\u003c\/li\u003e\n\u003cli\u003eMeets NAS 907 Type J standard for aircraft-quality drill performance\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a general-purpose cobalt extension drill bit compatible with any standard drill chuck accepting a 0.199-inch straight-cylindrical shank, suitable for use in handheld drills, drill presses, and magnetic base drills across metalworking and trade installation applications.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eA licensed machinist, journeyman tradesperson, or qualified technician should select proper speeds and feeds for the material being drilled when using cobalt bits. Secure the workpiece firmly before drilling and use cutting fluid or oil when drilling ferrous metals to extend tool life and improve hole finish. Inspect the bit for chipping or wear before each use. Never apply side loading to an extension drill, as the extended length increases leverage and the risk of breakage.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Wire Gauge)\u003c\/strong\u003e: No. 8\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Diameter\u003c\/strong\u003e: 0.199 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 6 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 2.4375 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.199 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\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: Split\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelf-Centering\u003c\/strong\u003e: Yes\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: Spiral\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length to Diameter Ratio\u003c\/strong\u003e: 4xD\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\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeb Thinning\u003c\/strong\u003e: Web-Thinned\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTool Material\u003c\/strong\u003e: Cobalt\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Straw\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: CO501-6\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard\u003c\/strong\u003e: NAS 907 Type J\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: 5995507\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PRECISION TWIST DRILL","offers":[{"title":"Default Title","offer_id":51695451504946,"sku":"5995507","price":20.92,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/9a3e48cb1baf3e332194f6fb8f7c2a57_a367b26b-2894-47b3-bae3-7e1797d8d15b.jpg?v=1788335194","url":"https:\/\/voomisupply.com\/products\/precision-twist-drill-5995507-cobalt-extension-drill-bit","provider":"Voomi Supply","version":"1.0","type":"link"}