{"product_id":"precision-twist-drill-5999439-screw-machine-drill-bit","title":"Precision Twist Drill 5999439 Screw Machine Drill Bit","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe PRECISION TWIST DRILL 5999439 is a screw machine length drill bit engineered for high-performance metal cutting in demanding shop and field environments. Built from high speed steel (HSS) with a coated finish, this bit features a 135-degree split point for fast self-centering starts and reduced thrust. The web-thinned, tapered web construction improves chip evacuation and cutting efficiency. At 0.4531 inches (29\/64 inch) in diameter with a 3-9\/16 inch overall length and a 2-1\/8 inch flute length, it fits standard straight-cylindrical shank drill chucks. The right-hand spiral flute geometry delivers clean, controlled cuts in high-alloy and difficult-to-machine materials. Meets ANSI and NAS 907 specifications.\u003c\/p\u003e\u003cp\u003eThis drill bit is rated for primary use in titanium workpieces and other high-performance metal cutting applications. The screw machine length format — shorter than jobber length — provides added rigidity and reduced deflection, making it well suited for CNC machining centers, drill presses, and manual drilling operations where hole location accuracy matters. The R40C series is a heavy-duty grade intended for production environments where tool life and repeatability are priorities. Machinists, tool and die makers, and maintenance technicians working in aerospace, manufacturing, and general metalworking will find this bit appropriate for close-tolerance drilling work.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e135-degree split point for self-centering starts and reduced walking on hard materials\u003c\/li\u003e\n\u003cli\u003eWeb-thinned tapered web improves chip flow and reduces cutting resistance\u003c\/li\u003e\n\u003cli\u003eHigh speed steel construction with coated finish for extended tool life\u003c\/li\u003e\n\u003cli\u003eScrew machine length provides greater rigidity and less deflection versus jobber-length bits\u003c\/li\u003e\n\u003cli\u003eRight-hand spiral flute, straight-cylindrical shank fits standard drill chucks\u003c\/li\u003e\n\u003cli\u003eMeets ANSI and NAS 907 specifications for dimensional and performance compliance\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use in standard straight-shank drill chucks on CNC machining centers, drill presses, and hand-held drilling equipment. Primary workpiece material rating is titanium; suitable for general high-performance metalworking applications within the 0.4500 to 0.5000 inch drill bit size range.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation and use should be performed by qualified machinists or maintenance technicians familiar with metal drilling operations. Secure the shank fully in the drill chuck and verify runout before use. Power down and de-energize all equipment before changing bits. Use appropriate cutting fluid or coolant as required by the workpiece material — note this bit does not feature through-coolant capability.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Inch)\u003c\/strong\u003e: 29\/64 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Decimal Inch)\u003c\/strong\u003e: 0.4531 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3-9\/16 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 2-1\/8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Point Angle\u003c\/strong\u003e: 135 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTool Material\u003c\/strong\u003e: High Speed Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Coated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\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\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePoint Type\u003c\/strong\u003e: Split\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeb Configuration\u003c\/strong\u003e: Tapered, Web-Thinned\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Length Type\u003c\/strong\u003e: Screw Machine\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute by Diameter Ratio\u003c\/strong\u003e: 2.5xD\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Material\u003c\/strong\u003e: Titanium\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Grade\u003c\/strong\u003e: Heavy Duty\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: R40C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards\u003c\/strong\u003e: ANSI, NAS 907\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.73 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: 5999439\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PRECISION TWIST DRILL","offers":[{"title":"Default Title","offer_id":51713742995762,"sku":"5999439","price":24.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/3a127f3d4a4d2e09c2be8232b57923c6.jpg?v=1788495012","url":"https:\/\/voomisupply.com\/products\/precision-twist-drill-5999439-screw-machine-drill-bit","provider":"Voomi Supply","version":"1.0","type":"link"}