{"product_id":"eagle-cutting-tool-c1090-128-i-cobalt-drill-bit-1-7-16-in","title":"Eagle Cutting Tool C1090-128-I Cobalt Drill Bit 1-7\/16 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe EAGLE CUTTING TOOL C1090-128-I is a cobalt slow spiral (screw machine length) drill bit designed for heavy-duty drilling in hard and abrasive materials. Built with a cobalt high-speed steel construction, this bit handles elevated cutting temperatures without losing hardness, making it well suited for production drilling where standard HSS bits wear prematurely. The 1-7\/16 inch cutting diameter and 1\/2 inch reduced shank allow the bit to seat securely in standard 1\/2 inch drill chucks and Jacobs-style keyless chucks without requiring a larger machine spindle.\u003c\/p\u003e\n\u003cp\u003eThis drill bit is used in metalworking, fabrication, and maintenance applications where large-diameter holes are needed in stainless steel, hardened steel, cast iron, titanium, and other tough alloys. The slow spiral geometry reduces chip packing and improves rigidity in shorter-length drilling operations. It is typically run on drill presses, milling machines, or heavy-duty electric drills in commercial and industrial shop environments. Machinists, tool-and-die workers, pipefitters, and industrial maintenance technicians commonly use this size for pipe flanges, structural steel, and manifold work.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eCobalt high-speed steel construction resists heat buildup during high-speed or dry cutting\u003c\/li\u003e\n  \u003cli\u003eSlow spiral geometry reduces chip load and improves hole quality in short-length drilling\u003c\/li\u003e\n  \u003cli\u003e1-7\/16 inch cutting diameter suits large-bore hole requirements in metal fabrication\u003c\/li\u003e\n  \u003cli\u003e1\/2 inch reduced shank fits standard 1\/2 inch chucks without requiring a larger spindle bore\u003c\/li\u003e\n  \u003cli\u003eScrew machine length profile provides added rigidity compared to jobber-length bits of the same diameter\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or direct-use cobalt drill bit for any drill press, milling machine, or heavy-duty hand drill equipped with a 1\/2 inch or larger chuck accepting a 1\/2 inch reduced shank.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by machinists or qualified tradespeople familiar with machine tool operation. Secure the shank fully into the chuck and confirm runout before beginning a cut. Always set spindle speed appropriate for the workpiece material and bit diameter — larger diameter bits require lower RPM. Use cutting fluid or coolant when drilling ferrous metals to extend bit life and maintain dimensional accuracy.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCutting Diameter\u003c\/strong\u003e: 1-7\/16 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 1\/2 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBit Material\u003c\/strong\u003e: Cobalt High-Speed Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpiral Type\u003c\/strong\u003e: Slow Spiral (Screw Machine Length)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 1.2 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMinimum Order 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: EAGLE CUTTING TOOL\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: C1090-128-I\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"EAGLE CUTTING TOOL","offers":[{"title":"Default Title","offer_id":51233668727090,"sku":"C1090-128-I","price":125.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/307620612.png?v=1780106305","url":"https:\/\/voomisupply.com\/products\/eagle-cutting-tool-c1090-128-i-cobalt-drill-bit-1-7-16-in","provider":"Voomi Supply","version":"1.0","type":"link"}