{"product_id":"precision-twist-drill-5998330-no-21-hss-jobber-drill-bit","title":"Precision Twist Drill 5998330 No. 21 Hss Jobber Drill Bit","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe PRECISION TWIST DRILL 5998330 is a jobber-length twist drill bit in wire gauge size No. 21 (0.1590 inches decimal), designed for general-purpose drilling in metal and other hard materials. The bit is manufactured from high speed steel with a steam oxide coating that reduces friction and provides light corrosion resistance during storage. It features a 118-degree standard point angle with a web-thinned, tapered web design for improved chip clearance and easier starting. Overall length is 3.25 inches with a 2.125-inch spiral flute length. Right-hand cut, regular spiral, and a straight-cylindrical shank round out the standard jobber configuration. Licensed machinists, maintenance technicians, and metal fabricators use this size regularly.\u003c\/p\u003e\u003cp\u003eThis bit is suited for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium in both production and maintenance-repair applications. The No. 21 wire size is commonly used for tapping operations and precision hole work in sheet metal and structural steel. The 13xD flute-to-diameter ratio and 2.125-inch maximum drilling depth make it a practical choice for through-hole and blind-hole work on benchtop drill presses and hand-held drills in shop and field settings. It is part of Precision Twist Drill Series R18 and conforms to ANSI standards.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eWire gauge size No. 21 — 0.1590-inch decimal diameter\u003c\/li\u003e\n\u003cli\u003eHigh speed steel construction with steam oxide finish for reduced friction\u003c\/li\u003e\n\u003cli\u003e118-degree standard point angle with web-thinned, tapered web for easier entry\u003c\/li\u003e\n\u003cli\u003eRight-hand cut with regular spiral flute, 2.125-inch flute length\u003c\/li\u003e\n\u003cli\u003eStraight-cylindrical shank, 0.1590-inch shank diameter, 1.125-inch shank length\u003c\/li\u003e\n\u003cli\u003eConforms to ANSI specifications; Series R18 general-purpose rating\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a general-purpose jobber-length replacement drill bit compatible with standard drill chucks and drill presses that accept straight-cylindrical shanks in the 0.1590-inch diameter range. Rated for use in steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium workpiece materials per material codes P, M, K, N, and S.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstall in a standard keyed or keyless drill chuck and verify the shank is fully seated before drilling. Power down or unplug the drill before changing bits. Use cutting fluid or coolant when drilling stainless steel, superalloys, or titanium to preserve edge life; this bit does not support coolant-through delivery. Follow shop safety practices and applicable ANSI standards for drilling operations.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Wire)\u003c\/strong\u003e: No. 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: Steam Oxide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Point Angle\u003c\/strong\u003e: 118 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePoint Type\u003c\/strong\u003e: Standard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Type\u003c\/strong\u003e: Spiral\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpiral Type\u003c\/strong\u003e: 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\u003eFlute Length\u003c\/strong\u003e: 2.125 inches (2-1\/8 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Drilling Depth\u003c\/strong\u003e: 2.125 inches (2-1\/8 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3.25 inches (3-1\/4 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: 0.1590 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Length\u003c\/strong\u003e: 1.125 inches (1-1\/8 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeb Configuration\u003c\/strong\u003e: Tapered, Web-Thinned\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute by Diameter Ratio\u003c\/strong\u003e: 13xD\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\u003eNumber of Flats\u003c\/strong\u003e: 0\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: R10-R15-R18\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\u003eStandard\u003c\/strong\u003e: ANSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.042 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: 5998330\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PRECISION TWIST DRILL","offers":[{"title":"Default Title","offer_id":51696611655986,"sku":"5998330","price":41.52,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/f2bbd17554f8298fe95bb319a732ccea_95ac6730-00be-4e31-bb3d-bcde80d54c29.jpg?v=1788344399","url":"https:\/\/voomisupply.com\/products\/precision-twist-drill-5998330-no-21-hss-jobber-drill-bit","provider":"Voomi Supply","version":"1.0","type":"link"}