{"product_id":"precision-twist-drill-5999795-jobber-drill-bit-21","title":"Precision Twist Drill 5999795 Jobber Drill Bit 21","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe PRECISION TWIST DRILL 5999795 is a jobber-length drill bit in wire gauge size 21, equivalent to 0.1590 inches in diameter. Built from high-speed steel with a cobalt oxide bronze coating, it is designed for general-purpose drilling in demanding materials. The 135-degree split point reduces walking and allows faster entry without a center punch. Overall length is 3.25 inches with a 1.0625-inch flute length. The straight cylindrical shank seats securely in standard drill chucks. This bit suits machinists, maintenance technicians, and metalworking professionals who need consistent performance across a range of workpiece materials.\u003c\/p\u003e\u003cp\u003eThis drill bit is well-suited for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium in both shop and field environments. It fits production drilling, maintenance repair, and fabrication work where wire-gauge sizing is specified. The 7xD flute-to-diameter ratio provides adequate chip clearance in typical jobber-length applications. The web-thinned, tapered web construction reduces thrust and improves cutting efficiency in harder materials. It meets NAS 907 specification requirements, making it appropriate for aerospace and precision manufacturing environments where dimensional standards are enforced.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eWire gauge size 21, 0.1590 inches decimal diameter\u003c\/li\u003e\n\u003cli\u003e135-degree standard split point reduces drill walking and center-punch need\u003c\/li\u003e\n\u003cli\u003eHigh-speed steel construction with cobalt oxide bronze coating for heat and wear resistance\u003c\/li\u003e\n\u003cli\u003eWeb-thinned tapered web reduces cutting thrust in hard and tough materials\u003c\/li\u003e\n\u003cli\u003eRight-hand spiral flute with 1.0625-inch maximum drilling depth\u003c\/li\u003e\n\u003cli\u003eMeets NAS 907 specification for precision and aerospace applications\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a general-purpose jobber-length drill bit compatible with any standard drill chuck accepting a 0.1590-inch straight cylindrical shank. Part of the R88CO-R89CO series from PRECISION TWIST DRILL.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstall in a standard drill chuck, keyed or keyless, and confirm shank is fully seated before use. Power down the drill press or disconnect the handheld tool before changing bits. Use appropriate cutting fluid or coolant when drilling stainless steel, superalloys, or titanium to extend tool life and maintain dimensional accuracy. Verify workpiece is securely clamped before drilling to prevent movement and bit breakage.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Wire)\u003c\/strong\u003e: 21\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Decimal Inch)\u003c\/strong\u003e: 0.1590 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Material\u003c\/strong\u003e: High Speed Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Cobalt Oxide Bronze\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Point Angle\u003c\/strong\u003e: 135 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Type\u003c\/strong\u003e: Spiral, 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\u003eOverall Length\u003c\/strong\u003e: 3.25 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 1.0625 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.1590 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Length\u003c\/strong\u003e: 2.1875 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight Cylindrical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Drilling Depth\u003c\/strong\u003e: 1.0625 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute by Diameter Ratio\u003c\/strong\u003e: 7xD\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeb Configuration\u003c\/strong\u003e: Tapered, Web-Thinned\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Material\u003c\/strong\u003e: Steel, Stainless Steel, Cast Iron, Non-Ferrous Metal, Superalloys and Titanium, Hard Material\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard\u003c\/strong\u003e: NAS 907\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: R88CO-R89CO\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\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: 5999795\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PRECISION TWIST DRILL","offers":[{"title":"Default Title","offer_id":51690802512178,"sku":"5999795","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/3e3d535a3d9bbc988b898b8040095a33_f6c2f896-cf47-4e13-9ce8-acc05c12c696.jpg?v=1788275616","url":"https:\/\/voomisupply.com\/products\/precision-twist-drill-5999795-jobber-drill-bit-21","provider":"Voomi Supply","version":"1.0","type":"link"}