{"product_id":"precision-twist-drill-5998398-5-16-inch-hss-jobber-drill-bit","title":"Precision Twist Drill 5998398 5\/16 Inch Hss Jobber Drill Bit","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe PRECISION TWIST DRILL 5998398 is a jobber-length twist drill bit designed for general-purpose drilling in a wide range of materials. Built from high speed steel with a bright uncoated finish, this bit carries a standard 118-degree point angle and a right-hand spiral flute for efficient chip evacuation. The straight-cylindrical shank measures 5\/16 inch in diameter, matching the cutting diameter for direct chuck compatibility. At 4.5 inches overall length with a 3.1875-inch flute and a 1.3125-inch shank, it fits standard drill presses, handheld power drills, and magnetic base drills used in fabrication and field service work.\u003c\/p\u003e\u003cp\u003eThis bit is suited for drilling steel, cast iron, non-ferrous metals, superalloys, and titanium in both shop and field environments. The Series R10H-R18H designation places it in a general-purpose jobber-length lineup commonly used by machinists, pipefitters, plumbers, electricians, and HVAC technicians for hole-making during equipment installation, panel work, and structural fabrication. The two-flute spiral geometry and web-thinned, tapered web design support consistent entry and reduced thrust in general-purpose applications where coolant-through capability is not required.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eHigh speed steel construction handles steel, cast iron, non-ferrous metals, superalloys, and titanium\u003c\/li\u003e\n\u003cli\u003e118-degree standard point angle for general-purpose entry without pre-drilling\u003c\/li\u003e\n\u003cli\u003eWeb-thinned, tapered web reduces drilling thrust and improves chip clearance\u003c\/li\u003e\n\u003cli\u003eBright uncoated finish — no coating buildup to affect tolerance in standard applications\u003c\/li\u003e\n\u003cli\u003eStraight-cylindrical shank fits all standard 3-jaw chucks without adapters\u003c\/li\u003e\n\u003cli\u003eANSI-standard geometry for consistent, predictable performance across drill presses and handheld tools\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use in standard 3-jaw drill chucks accepting a 5\/16-inch straight-cylindrical shank. Compatible primary workpiece materials include steel, cast iron, non-ferrous metals, superalloys, and titanium per Series R10H-R18H specifications.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eSecure the shank fully in the drill chuck before operation and verify chuck key is removed prior to powering the tool. For drilling metal, use cutting fluid or cutting oil to extend bit life and improve hole quality where the application allows. Inspect the cutting edges and point before each use — a dull or chipped point increases thrust and reduces hole accuracy. Follow applicable ANSI and workplace safety standards for eye protection and workpiece clamping when drilling ferrous metals.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size\u003c\/strong\u003e: 5\/16 inch (0.3125 inch)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Point Angle\u003c\/strong\u003e: 118 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: High Speed Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Bright\/Uncoated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 4.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 3.1875 inches (3-3\/16 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 5\/16 inch (0.3125 inch)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Length\u003c\/strong\u003e: 1.3125 inches (1-5\/16 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\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\u003ePoint Type\u003c\/strong\u003e: Standard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeb Configuration\u003c\/strong\u003e: Tapered, Web-Thinned\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Drilling Depth\u003c\/strong\u003e: 3.1875 inches\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: R10H-R18H\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: 0.083 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: 5998398\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PRECISION TWIST DRILL","offers":[{"title":"Default Title","offer_id":51722908434738,"sku":"5998398","price":18.81,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/ac335c1d53632e99459aa82e5500dfd1_7807a296-8773-4af4-b369-6831d1ddeeec.jpg?v=1788597720","url":"https:\/\/voomisupply.com\/products\/precision-twist-drill-5998398-5-16-inch-hss-jobber-drill-bit","provider":"Voomi Supply","version":"1.0","type":"link"}