{"product_id":"accupro-c911-00440-thread-mill-4-40-internal-2-flute-tialn","title":"Accupro C911-00440 Thread Mill 4-40 Internal 2 Flute Tialn","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe ACCUPRO C911-00440 is a helical flute thread mill designed for cutting internal 4-40 UNC threads in a single helical pass. Built from micrograin solid carbide and coated with TiAlN, it delivers consistent thread form and extended tool life in ferrous and non-ferrous materials. The 2-flute geometry supports chip evacuation in tight bores, while the 0.085 inch cutting diameter suits small-bore thread milling applications where taps may not be practical. At 40 teeth per inch and a 0.219 inch length of cut, this tool is well matched to standard 4-40 thread depth requirements. Machinists and tooling professionals in precision machining, mold and die, and aerospace component shops are the primary users.\u003c\/p\u003e\u003cp\u003eThis thread mill is suited for CNC machining centers running internal thread milling cycles on small-diameter holes. The 1\/8 inch shank diameter makes it compatible with standard ER collet systems and small-bore tool holders common in precision shops. It is appropriate for use on steel, stainless, aluminum, and other machinable alloys where a 4-40 UNC internal thread is required. Because the cutting diameter is smaller than the thread minor diameter, the tool can be used for thread milling in through-holes and blind holes without requiring a separate tap or thread-forming step.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eMicrograin solid carbide construction for rigidity and wear resistance in small-diameter thread milling\u003c\/li\u003e\n\u003cli\u003eTiAlN coating provides thermal protection and extends tool life in dry or semi-dry cutting conditions\u003c\/li\u003e\n\u003cli\u003e2-flute helical design promotes chip evacuation in confined internal bores\u003c\/li\u003e\n\u003cli\u003e0.085 inch cutting diameter sized for 4-40 UNC internal thread profiles\u003c\/li\u003e\n\u003cli\u003e0.219 inch length of cut accommodates standard 4-40 thread engagement depths\u003c\/li\u003e\n\u003cli\u003eNo coolant-through design — suited for external coolant or dry machining setups\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for CNC machining centers using helical interpolation thread milling cycles to produce 4-40 UNC internal threads. Fits standard 1\/8 inch ER collet chucks and compatible small-bore tool holders.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThread mills of this type are installed by licensed machinists or CNC tooling technicians using a calibrated collet or tool holder with proper runout tolerance. Ensure the spindle is fully stopped and the machine is in a safe state before changing or measuring the tool. Program helical interpolation per the control manufacturer and tool manufacturer specifications — do not use single-pass tapping cycles with this tool. Verify cutting parameters against the workpiece material before production runs.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 4-40\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Type\u003c\/strong\u003e: Internal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTeeth Per Inch\u003c\/strong\u003e: 40 TPI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCutting Diameter\u003c\/strong\u003e: 0.085 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength of Cut\u003c\/strong\u003e: 0.219 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 1\/8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 2\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: 0.02 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: ACCUPRO\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: C911-00440\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ACCUPRO","offers":[{"title":"Default Title","offer_id":51752495939890,"sku":"C911-00440","price":191.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/0b12fd34bb700aa8890bd9856c0ee5a7.jpg?v=1788928608","url":"https:\/\/voomisupply.com\/products\/accupro-c911-00440-thread-mill-4-40-internal-2-flute-tialn","provider":"Voomi Supply","version":"1.0","type":"link"}