{"product_id":"triumph-twist-drill-060428-screw-machine-drill-bit-7-16-in","title":"Triumph Twist Drill 060428 Screw Machine Drill Bit 7\/16 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe TRIUMPH TWIST DRILL 060428 is a screw machine length drill bit designed for high-production drilling in metal, steel, and other hard materials. The shortened overall length of 3-7\/16 inches provides added rigidity compared to jobber-length bits, reducing deflection and improving hole accuracy in close-tolerance applications. Manufactured from high-speed steel with an oxide coating, this bit handles the heat and friction generated during continuous-duty drilling. The 135-degree split point starts on contact without center-punching and reduces thrust. A tapered web configuration further reinforces the cutting edge for heavy-duty work.\u003c\/p\u003e\n\u003cp\u003eThis bit is suited for use in drill presses, CNC machining centers, and manual machine tools where a stubby, rigid bit is preferred over jobber length. Typical applications include production shops, manufacturing environments, and trade professionals drilling through ferrous metals, stainless steel, cast iron, and similar materials. The straight-cylindrical shank fits standard drill chucks without adapters. This is a Series T4HD heavy-duty bit, appropriate for machinists, millwrights, and tool-and-die tradespeople who require consistent, repeatable hole geometry.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e135-degree split point starts on contact, eliminating the need for a center punch and reducing walking\u003c\/li\u003e\n  \u003cli\u003eScrew machine (stub) length at 3-7\/16 inches overall for increased rigidity and reduced deflection\u003c\/li\u003e\n  \u003cli\u003eHigh-speed steel construction with oxide coating for heat resistance and extended tool life\u003c\/li\u003e\n  \u003cli\u003eWeb-thinned, tapered web configuration reduces cutting thrust and improves chip evacuation\u003c\/li\u003e\n  \u003cli\u003eRight-hand spiral flute with 2-1\/16 inch flute length for efficient chip clearing\u003c\/li\u003e\n  \u003cli\u003eStraight-cylindrical shank fits standard three-jaw drill chucks without a sleeve or adapter\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or standard tooling selection for production drilling setups requiring a 7\/16 inch diameter screw machine length bit with a straight-cylindrical shank.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by machinists or qualified trade professionals. Secure the shank firmly in a properly sized drill chuck and verify runout before drilling. Always power down and de-energize the machine spindle before changing or inspecting tooling. Follow applicable shop safety practices and machine manufacturer guidelines when selecting speeds and feeds for the workpiece material.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Diameter\u003c\/strong\u003e: 7\/16 inches (0.4375 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3-7\/16 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 2-1\/16 inches (2.0625 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\u003ePoint Type\u003c\/strong\u003e: Split\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: Oxide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpiral Type\u003c\/strong\u003e: Regular\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 Bit Grade\u003c\/strong\u003e: Heavy Duty\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: T4HD\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.65 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 23241635\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: TRIUMPH TWIST DRILL\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 060428\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TRIUMPH TWIST DRILL","offers":[{"title":"Default Title","offer_id":67912052670770,"sku":"060428","price":22.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/bdb5921626d20cf7b4e92e75f82e74d7.jpg?v=1791226156","url":"https:\/\/voomisupply.com\/products\/triumph-twist-drill-060428-screw-machine-drill-bit-7-16-in","provider":"Voomi Supply","version":"1.0","type":"link"}