{"product_id":"harvey-tool-987116-c8-thread-mill-4-40-internal-solid-carbide","title":"Harvey Tool 987116-C8 Thread Mill 4-40 Internal Solid Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe HARVEY TOOL 987116-C8 is a solid carbide helical flute thread mill designed for cutting internal 4-40 UNC threads in a single helical pass. With a 0.0890-inch cutting diameter, a 0.2750-inch length of cut, and a 1\/8-inch (0.1250-inch) shank, this tool is built for tight-tolerance threading in small-diameter holes. The three-flute geometry promotes chip evacuation and stable cutting action. A Titanium Diboride (TiB2) coating reduces friction and improves wear resistance, extending tool life in abrasive or hardened workpiece materials. Machining professionals and tool-and-die shops use this mill in CNC machining centers where thread milling is preferred over tapping for precision or material-specific requirements.\u003c\/p\u003e\n\u003cp\u003eThis thread mill is suited for internal threading operations on small fastener holes requiring a 4-40 thread profile with 40 teeth per inch. The 2.000-inch overall length provides adequate reach for most standard workpiece setups. The minimum nominal hole diameter for this tool is 0.1120 inches, making it appropriate for close-clearance bores. It is used in production machining, prototype work, and repair applications where a dedicated tap would risk breakage or where thread quality demands are high. CNC machinists, mold makers, and precision machine shops are the primary users.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eSolid carbide construction for rigidity and dimensional stability in demanding materials\u003c\/li\u003e\n  \u003cli\u003eTitanium Diboride (TiB2) coating reduces friction and extends tool life\u003c\/li\u003e\n  \u003cli\u003eThree-flute helical design promotes chip flow and smooth thread form\u003c\/li\u003e\n  \u003cli\u003eCuts 4-40 internal threads at 40 TPI in a single helical interpolation pass\u003c\/li\u003e\n  \u003cli\u003e0.1250-inch shank diameter fits standard ER collets and small-bore tool holders\u003c\/li\u003e\n  \u003cli\u003e2.000-inch overall length with 0.2750-inch length of cut for precise depth control\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. Requires a minimum nominal bore diameter of 0.1120 inches. Compatible with standard 1\/8-inch ER collet tool holders.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThread milling requires a CNC control with helical interpolation capability. Secure the tool in a precision collet chuck and verify runout before cutting. Always program the correct thread lead and helix direction for the desired thread hand. Do not use in manual or non-interpolating machines, as this tool is not designed for direct axial threading.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\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\u003eTeeth Per Inch\u003c\/strong\u003e: 40 TPI\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 3\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCutting Diameter\u003c\/strong\u003e: 0.0890 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.1250 inches (1\/8 inch)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength of Cut\u003c\/strong\u003e: 0.2750 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMinimum Nominal Diameter\u003c\/strong\u003e: 0.1120 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2.0000 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Solid Carbide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Titanium Diboride (TiB2)\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: 0.01 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 23242117\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: HARVEY TOOL\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 987116-C8\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HARVEY TOOL","offers":[{"title":"Default Title","offer_id":51731379880242,"sku":"987116-C8","price":224.38,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/baad090b35b130708244a6c01cb9894d_5c4dbee5-6dd8-4596-856e-e7134c45820a.jpg?v=1788730226","url":"https:\/\/voomisupply.com\/products\/harvey-tool-987116-c8-thread-mill-4-40-internal-solid-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}