{"product_id":"guhring-9003050063500-cobalt-jobber-drill-bit-letter-e","title":"Guhring 9003050063500 Cobalt Jobber Drill Bit Letter E","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe GUHRING 9003050063500 is a cobalt jobber-length drill bit sized at Letter E (0.250 inch decimal) with a 118-degree standard point angle. Finished with an oxide coating for added wear resistance, it is built to DIN 338 specification and carries a web-thinned, tapered web configuration that reduces thrust during entry. The straight-cylindrical shank measures 0.250 inch in diameter and seats securely in standard drill chucks. With a 2-flute right-hand spiral flute design and a general-purpose tool performance rating, this bit is suited for machinists, maintenance technicians, and fabricators working with ferrous and cast iron materials.\u003c\/p\u003e\u003cp\u003eThis drill bit is designed for general-purpose drilling in cast iron and steel in both production and maintenance environments. The Series 305 designation places it in a jobber-length family intended for through-hole and blind-hole work where a standard flute-to-diameter ratio is appropriate. It is a single-piece, individually packaged bit commonly used in manual drill presses, CNC machines, and hand-held power drills where a 1\/4-inch straight-shank tool is required.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eCobalt construction with oxide coating for improved heat and wear resistance\u003c\/li\u003e\n\u003cli\u003e118-degree standard point angle suitable for general-purpose ferrous drilling\u003c\/li\u003e\n\u003cli\u003eWeb-thinned tapered web reduces drill thrust and improves chip clearance\u003c\/li\u003e\n\u003cli\u003eRight-hand cut, 2-flute spiral design for efficient chip evacuation\u003c\/li\u003e\n\u003cli\u003eDIN 338 specification ensures dimensional consistency\u003c\/li\u003e\n\u003cli\u003eStraight-cylindrical shank fits standard chucks without adapters\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a general-purpose jobber-length drill bit compatible with any drill press, machining center, or hand-held drill accepting a 0.250-inch straight-cylindrical shank. Rated for primary workpiece materials cast iron and steel per material codes K and P.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation and use should be performed by qualified machinists or maintenance technicians familiar with drill press and machining safety practices. Secure the shank fully in the chuck and verify concentricity before drilling. Disconnect power to the machine before changing bits or adjusting workpiece fixturing. Operator should select appropriate feed rate and cutting speed for the workpiece material to avoid premature bit wear or breakage.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Inch)\u003c\/strong\u003e: 1\/4 inch\u003c\/li\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 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\u003eDrill Bit Material\u003c\/strong\u003e: Cobalt\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish\/Coating\u003c\/strong\u003e: Oxide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Type\u003c\/strong\u003e: Spiral\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpiral Type\u003c\/strong\u003e: 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\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.2500 inch (6.35 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 101 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 63 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Length\u003c\/strong\u003e: 38 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Drilling Depth\u003c\/strong\u003e: 2.110 inches (53.48 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute by Diameter Ratio\u003c\/strong\u003e: 5xD\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 Diameter Tolerance\u003c\/strong\u003e: -0.022 to 0.000 mm\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\u003eTool Performance\u003c\/strong\u003e: General Purpose\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard\u003c\/strong\u003e: DIN 338\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 305\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: 0.05 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: GUHRING\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 9003050063500\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GUHRING","offers":[{"title":"Default Title","offer_id":51738463437106,"sku":"9003050063500","price":19.92,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/f89226984c5e769c14f9059e3a69b3ed.jpg?v=1788799853","url":"https:\/\/voomisupply.com\/products\/guhring-9003050063500-cobalt-jobber-drill-bit-letter-e","provider":"Voomi Supply","version":"1.0","type":"link"}