{"product_id":"guhring-9055240078000-cobalt-stub-drill-bit-0-3071-in","title":"Guhring 9055240078000 Cobalt Stub Drill Bit 0.3071 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe GUHRING 9055240078000 is a cobalt stub-length (screw machine length) drill bit designed for high-speed, high-accuracy hole making in metalworking and machining applications. Built from M35 cobalt high-speed steel, this bit delivers superior heat and wear resistance compared to standard HSS tooling. The bright\/uncoated finish keeps tolerances tight right out of the box. At 0.3071 inches (7.80 mm) in diameter with a 118-degree four-facet split point and web-thinned tip, it starts on center without a pilot hole and reduces thrust in drilling operations. Licensed machinists, tool-and-die technicians, and maintenance mechanics are the primary installers.\u003c\/p\u003e\n\u003cp\u003eThis stub-length drill bit is suited for CNC machining centers, manual drill presses, and screw machine setups where a shorter flute length provides rigidity and reduces deflection. Its 3xD flute-to-diameter ratio and maximum drilling depth of 0.9960 inches (25.30 mm) make it appropriate for through-holes and blind holes in aluminum and similar non-ferrous and softer ferrous materials. The straight-cylindrical shank seats cleanly in standard drill chucks and collet holders without modification.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eM35 cobalt construction provides increased heat resistance over standard HSS bits\u003c\/li\u003e\n  \u003cli\u003eFour-facet split point with web thinning reduces walking and lowers required thrust\u003c\/li\u003e\n  \u003cli\u003eStub\/screw machine length body increases rigidity and minimizes deflection\u003c\/li\u003e\n  \u003cli\u003eRight-hand spiral flute evacuates chips efficiently during through and blind-hole drilling\u003c\/li\u003e\n  \u003cli\u003eBright\/uncoated finish maintains dimensional accuracy at the cutting edge\u003c\/li\u003e\n  \u003cli\u003eConforms to DIN 1897 specification for consistent geometry and interchangeability\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement and standard tooling option for applications requiring a 7.80 mm (0.3071 inch) drill within the DIN 1897 stub-length standard. Fits any drill chuck or collet accepting a 7.80 mm straight-cylindrical shank. Part of GUHRING Series 5524.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by qualified machinists or maintenance technicians. Secure the shank fully in the chuck or collet before operation and verify runout is within acceptable limits for the application. Ensure spindle speed and feed rate are set per the workpiece material before engaging the cut. Do not use this bit as a reamer or attempt to resharpen without proper grinding equipment and knowledge of the original four-facet geometry.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Diameter\u003c\/strong\u003e: 0.3071 inches (7.80 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3.11 inches (79.00 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 1.457 inches (37.00 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Drilling Depth\u003c\/strong\u003e: 0.9960 inches (25.30 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Point Angle\u003c\/strong\u003e: 118 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePoint Type\u003c\/strong\u003e: Four Facet Split\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\u003eFlute by Diameter Ratio\u003c\/strong\u003e: 3xD\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: 7.80 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTool Material\u003c\/strong\u003e: Cobalt (M35)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Bright\/Uncoated\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\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Material\u003c\/strong\u003e: Aluminum\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Diameter Tolerance\u003c\/strong\u003e: +0.000 to -0.022 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Length Type\u003c\/strong\u003e: Stub\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 5524\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandard\u003c\/strong\u003e: DIN 1897\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.053 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 1\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: GUHRING\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 9055240078000\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GUHRING","offers":[{"title":"Default Title","offer_id":51746308063538,"sku":"9055240078000","price":24.58,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/28cbb6959fc353d271216a66a0eeaebd.jpg?v=1788868168","url":"https:\/\/voomisupply.com\/products\/guhring-9055240078000-cobalt-stub-drill-bit-0-3071-in","provider":"Voomi Supply","version":"1.0","type":"link"}