{"product_id":"precision-twist-drill-5997608-drill-bit-letter-e-1-4-in","title":"Precision Twist Drill 5997608 Drill Bit Letter E 1\/4 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe PRECISION TWIST DRILL 5997608 is a jobber-length drill bit sized to Letter E, equivalent to 0.2500 inches in diameter, designed for general-purpose drilling in metalworking applications. Ground from high-speed steel with a steam oxide coating, the bit features a 135-degree split-point tip for reduced walking and faster penetration on hard surfaces. The overall length is 4 inches with a 2.75-inch spiral flute and a straight cylindrical shank. It is web-thinned with a tapered web configuration, reducing thrust requirements during drilling. This bit is used by machinists, maintenance mechanics, and trade professionals working with metal fabrication and repair tasks.\u003c\/p\u003e\n\u003cp\u003eThe 5997608 is suited for drilling into steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. The regular spiral flute with right-hand cut geometry handles a broad range of metalworking scenarios, including production drilling and field repair work. With a flute-to-diameter ratio of 11xD and a 2.75-inch maximum drilling depth, it is appropriate for through-hole and blind-hole operations in material thicknesses up to the rated flute length. This is a single-piece, individual-quantity bit commonly kept in trade tool kits and service vans.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eLetter E size — 0.2500 inches diameter — matches standard tap and clearance drill charts for 1\/4-inch fastener work\u003c\/li\u003e\n  \u003cli\u003e135-degree split-point tip reduces bit walking on flat or curved metal surfaces without a center punch\u003c\/li\u003e\n  \u003cli\u003eSteam oxide coating provides light lubricity and corrosion resistance during storage and use\u003c\/li\u003e\n  \u003cli\u003eWeb-thinned tapered web lowers drilling thrust and extends bit life in harder alloys\u003c\/li\u003e\n  \u003cli\u003eRight-hand cut, regular spiral flute with 2-flute geometry for efficient chip evacuation\u003c\/li\u003e\n  \u003cli\u003eMeets ANSI and NAS 907 standards; rated for steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a general-purpose jobber-length drill bit for use in standard 3-jaw drill chucks, drill presses, and hand drills accepting a 0.2500-inch straight cylindrical shank. Compatible with applications calling for Letter E or 1\/4-inch drill bit sizing per ANSI and NAS 907 standards.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eSecure the straight cylindrical shank fully in the chuck before operation and verify the chuck is tightened with the key before starting the drill. Use appropriate cutting fluid or coolant when drilling stainless steel, superalloys, or titanium to prevent work hardening and premature tip wear. Do not exceed the rated 2.75-inch flute depth in a single pass on deep holes — peck drilling in stages improves chip clearance and reduces heat buildup. Follow applicable shop safety standards and wear eye protection when drilling metal.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Letter)\u003c\/strong\u003e: E\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Decimal)\u003c\/strong\u003e: 0.2500 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\u003eMaterial\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\u003eOverall Length\u003c\/strong\u003e: 4 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 2.75 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.2500 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Length\u003c\/strong\u003e: 1.25 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\u003eWeb Configuration\u003c\/strong\u003e: Tapered, Web-Thinned\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Drilling Depth\u003c\/strong\u003e: 2.75 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute by Diameter Ratio\u003c\/strong\u003e: 11xD\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePoint Type\u003c\/strong\u003e: Standard\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: R10B-R15B-R18B\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandards\u003c\/strong\u003e: ANSI, NAS 907\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\u003eTool Performance\u003c\/strong\u003e: General Purpose, Heavy Duty Grade\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.19 pounds\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: PRECISION TWIST DRILL\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 5997608\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PRECISION TWIST DRILL","offers":[{"title":"Default Title","offer_id":51689721037106,"sku":"5997608","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/e54529b321c8d88e787e6c4f803d17c6_8c81e54a-59e8-4abc-bd9d-944ba57907cf.jpg?v=1788263461","url":"https:\/\/voomisupply.com\/products\/precision-twist-drill-5997608-drill-bit-letter-e-1-4-in","provider":"Voomi Supply","version":"1.0","type":"link"}