{"product_id":"chicago-latrobe-49397-screw-machine-drill-bit-0-144-in-hss","title":"Chicago-latrobe 49397 Screw Machine Drill Bit 0.144 in Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe CHICAGO-LATROBE 49397 is a screw machine length drill bit designed for high-production drilling in ferrous and cast iron workpieces. Built from high speed steel with a coated finish, it measures 0.144 inches (wire size 27) in diameter with an overall length of 2-1\/16 inches and a 1-inch flute length. The 135-degree split point reduces walking and requires less feed pressure at entry, making it well suited for heavy-duty shop and field drilling applications. Right-hand spiral flutes evacuate chips efficiently during through-hole operations. This bit meets NAS 907 and ISO standards, confirming dimensional and performance consistency for professional use.\u003c\/p\u003e\n\u003cp\u003eScrew machine length drill bits are shorter than jobber-length bits, which increases rigidity and reduces deflection in close-tolerance drilling setups. The 49397 is intended for use in drill presses, CNC turret lathes, screw machines, and hand-held power drills where a stiffer bit improves hole accuracy. Primary workpiece materials include cast iron and steel, making it a practical choice for HVAC bracket fabrication, plumbing rough-in metalwork, electrical panel work, and general mechanical assembly. It is sold individually but requires a minimum order of 12 units per order.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e0.144 inch diameter (wire size 27) with a diameter tolerance of +0.0000 to -0.0007 inches for consistent close-tolerance holes\u003c\/li\u003e\n  \u003cli\u003e135-degree split point reduces entry walking and lowers required feed force on steel and cast iron\u003c\/li\u003e\n  \u003cli\u003eWeb-thinned parallel web construction improves chip clearance and reduces heat buildup at the cutting edge\u003c\/li\u003e\n  \u003cli\u003eScrew machine length (2-1\/16 inches overall) provides added rigidity and reduced deflection compared to jobber-length bits\u003c\/li\u003e\n  \u003cli\u003eHigh speed steel construction with coated finish extends service life in repetitive production drilling\u003c\/li\u003e\n  \u003cli\u003eMeets NAS 907 and ISO standards for dimensional accuracy and heavy-duty performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use in standard straight-shank drill chucks on drill presses, screw machines, CNC turret lathes, and hand-held power drills. Rated for primary workpiece materials of cast iron and steel per Series 159 heavy-duty specifications.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eA licensed machinist or qualified tradesperson should secure the shank fully in a properly sized chuck before operating. Ensure the workpiece is firmly clamped and the drill press or machine is powered down before changing or inspecting bits. Use appropriate cutting fluid when drilling steel to extend bit life and maintain hole quality. Inspect the cutting edge for wear regularly, as a dull split point will increase heat and reduce hole accuracy.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Diameter\u003c\/strong\u003e: 0.144 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWire Size\u003c\/strong\u003e: 27\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2-1\/16 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 1 inch\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\u003eNumber of Flutes\u003c\/strong\u003e: 2\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\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\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\u003eWeb Configuration\u003c\/strong\u003e: Parallel, 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\u003eTool Performance\u003c\/strong\u003e: Heavy-Duty\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDiameter Tolerance\u003c\/strong\u003e: +0.0000 to -0.0007 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Material\u003c\/strong\u003e: Cast Iron, Steel\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: 159\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandards\u003c\/strong\u003e: NAS 907, ISO\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.0084 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMinimum Order Quantity\u003c\/strong\u003e: 12\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: CHICAGO-LATROBE\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 49397\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CHICAGO-LATROBE","offers":[{"title":"Default Title","offer_id":51753134194994,"sku":"49397","price":37.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/80f37af2c3a852ae922c6b0909638d81.jpg?v=1788933148","url":"https:\/\/voomisupply.com\/products\/chicago-latrobe-49397-screw-machine-drill-bit-0-144-in-hss","provider":"Voomi Supply","version":"1.0","type":"link"}