{"product_id":"accupro-c911-31218-thread-mill-5-16-18-internal-solid-carbide","title":"Accupro C911-31218 Thread Mill 5\/16-18 Internal Solid Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe ACCUPRO C911-31218 is a helical flute thread mill designed for cutting internal 5\/16-18 UNC threads in a CNC machining environment. Built from micrograin solid carbide and coated with TiAlN, it delivers the hardness and heat resistance required for threading steel, stainless, aluminum, and other common workpiece materials. The tool features 3 right-hand flutes, a 0.235-inch cutting diameter, and a 0.625-inch length of cut. With 18 teeth per inch and a 0.25-inch shank diameter, it is suited for production threading on machining centers where a single tool handles multiple thread sizes by adjusting the helical interpolation path.\u003c\/p\u003e\n\u003cp\u003eThis thread mill is used in job shops, production facilities, and toolrooms for generating precise internal threads in a single helical pass. It is appropriate for through-holes and blind holes where conventional tapping presents tool-breakage risk or where climb-milling thread geometry is preferred. The 0.3125-inch minimum nominal diameter and 0.625-inch length of cut make it a practical choice for shallow-to-moderate thread depth applications in ferrous and non-ferrous materials. No coolant-through capability means external coolant or mist is the standard setup for chip evacuation.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eMicrograin solid carbide substrate for rigidity and edge retention\u003c\/li\u003e\n  \u003cli\u003eTiAlN coating improves heat resistance and tool life in ferrous materials\u003c\/li\u003e\n  \u003cli\u003e3 right-hand helical flutes for efficient chip evacuation on internal threads\u003c\/li\u003e\n  \u003cli\u003eCuts 5\/16-18 UNC internal threads with 0.235-inch cutting diameter\u003c\/li\u003e\n  \u003cli\u003e0.625-inch length of cut accommodates typical thread engagement depths\u003c\/li\u003e\n  \u003cli\u003e0.25-inch shank diameter fits standard collet and end mill holder tooling\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use in CNC machining centers capable of helical interpolation for internal thread milling of 5\/16-18 UNC threads. Compatible with 0.25-inch collet chucks, ER collets, and end mill holders with a 0.25-inch bore.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThread mills require a CNC control capable of helical interpolation — confirm G-code support before setup. Secure the shank fully in the holder to minimize runout, as excessive runout directly impacts thread quality and tool life. Power down the spindle and follow lockout\/tagout procedures when changing tooling. Do not use this tool for hand tapping or in manual milling applications.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 5\/16-18\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Type\u003c\/strong\u003e: Internal\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTeeth Per Inch\u003c\/strong\u003e: 18 TPI\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCutting Diameter\u003c\/strong\u003e: 0.235 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength of Cut\u003c\/strong\u003e: 0.625 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMinimum Nominal Diameter\u003c\/strong\u003e: 0.3125 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.25 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter Tolerance\u003c\/strong\u003e: 0.0003 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 3\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Solid Carbide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Grade\u003c\/strong\u003e: Micrograin\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: TiAlN\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: 0.06 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: ACCUPRO\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: C911-31218\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ACCUPRO","offers":[{"title":"Default Title","offer_id":51729712742706,"sku":"C911-31218","price":254.12,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/f625ffd37388efc6cb81461243b60136.jpg?v=1788708257","url":"https:\/\/voomisupply.com\/products\/accupro-c911-31218-thread-mill-5-16-18-internal-solid-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}