{"product_id":"cle-line-c23357-jobber-drill-bit-letter-e-1-4-in-cobalt","title":"Cle-line C23357 Jobber Drill Bit Letter E 1\/4 in Cobalt","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe CLE-LINE C23357 is a cobalt jobber length drill bit sized at Letter E (0.2500 inches \/ 1\/4 inch), built for high-performance drilling in tough materials. The 135-degree split point reduces walking and requires no center punch on most surfaces. With a gold finish, web-thinned geometry, and a tapered web configuration, this bit is engineered for heavy-duty production drilling. The overall length is 4 inches, with a 2.75-inch flute length and a straight-cylindrical shank of 0.2500 inches. Two spiral flutes channel chips efficiently and help maintain cutting speed under load. This bit conforms to ASME B94.11M and is rated for continuous shop use.\u003c\/p\u003e\n\u003cp\u003eThe C23357 is designed for right-hand cutting applications across a range of workpiece materials including aluminum, titanium, and superalloys. It fits standard jobber-length drill chucks and is suited for use in manual drill presses, CNC drilling centers, and hand-held power tools where a 1\/4-inch straight-shank bit is required. The cobalt construction allows it to handle elevated cutting temperatures without losing hardness, making it a practical choice for aerospace-grade materials and stainless alloys encountered in mechanical and fabrication work.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eCobalt construction with gold finish for heat resistance and extended tool life in hard materials\u003c\/li\u003e\n  \u003cli\u003e135-degree split point reduces thrust and eliminates the need for center punching\u003c\/li\u003e\n  \u003cli\u003eWeb-thinned, tapered web design improves chip evacuation and reduces cutting resistance\u003c\/li\u003e\n  \u003cli\u003eRight-hand spiral flutes (quantity: 2) provide efficient chip clearing during through-hole drilling\u003c\/li\u003e\n  \u003cli\u003eStraight-cylindrical shank (0.2500 inches) fits standard 3-jaw chucks without adapters\u003c\/li\u003e\n  \u003cli\u003eMeets ASME B94.11M standard; diameter tolerance held to +0.0000 \/ -0.0007 inches\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style heavy-duty replacement or direct-use jobber drill bit for applications requiring a 1\/4-inch (Letter E) straight-shank cobalt bit rated for aluminum, superalloy, and titanium workpiece materials per CLE-LINE Series 1802.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eMachinists and fabricators should secure the shank fully in the chuck and verify runout before beginning a drilling cycle. Always power down or lock out the machine before changing bits. When drilling titanium or superalloys, use appropriate cutting fluid to manage heat buildup and extend bit life. Follow applicable shop safety standards and machine manufacturer guidelines for speed and feed settings.\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 Inch)\u003c\/strong\u003e: 0.2500 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Material\u003c\/strong\u003e: Cobalt\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Finish\/Coating\u003c\/strong\u003e: Gold\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Grade\u003c\/strong\u003e: Heavy Duty\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\u003eFlute Type\u003c\/strong\u003e: Spiral (Regular)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 2\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\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 Type\u003c\/strong\u003e: Straight-Cylindrical\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\u003eWeb Configuration\u003c\/strong\u003e: Tapered, Web-Thinned\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 Materials\u003c\/strong\u003e: Aluminum, Superalloy, Titanium\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: 1802\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandard\u003c\/strong\u003e: ASME B94.11M\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.399 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: CLE-LINE\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: C23357\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CLE-LINE","offers":[{"title":"Default Title","offer_id":52069776392498,"sku":"C23357","price":87.44,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/a97db6aee61b4ba826e69a387187a246.jpg?v=1790048014","url":"https:\/\/voomisupply.com\/products\/cle-line-c23357-jobber-drill-bit-letter-e-1-4-in-cobalt","provider":"Voomi Supply","version":"1.0","type":"link"}