{"product_id":"kennametal-4109644-threading-insert-nas3r8-kcu25-carbide","title":"Kennametal 4109644 Threading Insert NAS3R8 KCU25 Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe KENNAMETAL 4109644 is a carbide threading insert designed for cutting Stub Acme threads at 8 threads per inch (TPI). It carries the KCU25 manufacturer grade and features a Physical Vapor Deposition (PVD)-applied Aluminum Titanium Nitride (AlTiN) finish coating for improved wear resistance and heat management at the cutting edge. Part of the Top Notch series, this insert is sized at Insert Size 3 and has a cutting tip width of 0.0476 inches (1.21 mm), a corner radius of 0.005 inches (0.13 mm), and a 29-degree included angle. It is configured for right-hand cutting and handles both internal and external thread applications. Machinists and toolroom professionals install this insert into compatible Top Notch toolholders on CNC lathes and manual turning equipment.\u003c\/p\u003e\u003cp\u003eThis insert is suited for threading operations on Stub Acme profiles in metalworking environments where tight thread geometry and surface finish are required. The Stub Acme thread form is common in power transmission components, lead screws, and linear motion hardware found in both production and maintenance machining. The AlTiN PVD coating supports cutting in alloy steels and harder workpiece materials. The right-hand orientation applies to the majority of conventional turning setups. Both internal and external thread cutting are supported, making this a versatile insert for shops running varied threading jobs on a single toolholder platform.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eKCU25 carbide grade with PVD-applied AlTiN coating for wear resistance in demanding threading operations\u003c\/li\u003e\n\u003cli\u003eStub Acme thread standard at 8 TPI with a 29-degree included angle\u003c\/li\u003e\n\u003cli\u003eRight-hand insert configured for both internal and external thread cutting\u003c\/li\u003e\n\u003cli\u003eCutting tip width of 0.0476 inches (1.21 mm) with a 0.005-inch corner radius for accurate thread form\u003c\/li\u003e\n\u003cli\u003ePart of the Top Notch series for use with compatible Top Notch toolholders\u003c\/li\u003e\n\u003cli\u003eInsert Size 3 with a thickness of 0.1949 inches (4.95 mm)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use in KENNAMETAL Top Notch series toolholders that accept NAS-style Insert Size 3 threading inserts. Verify toolholder designation against KENNAMETAL Top Notch system specifications before ordering.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThreading inserts should be seated and indexed by a qualified machinist or toolroom technician. Power down and lock out the machine spindle before changing or indexing inserts. Use the correct torque wrench and Top Notch clamping hardware as specified by the toolholder manufacturer — do not overtighten the clamping screw by feel alone. Inspect the insert pocket for chips or debris before seating the new insert to ensure proper contact and thread-form accuracy.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Style\u003c\/strong\u003e: NAS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Material\u003c\/strong\u003e: Carbide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Grade\u003c\/strong\u003e: KCU25\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: Stub Acme\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Type\u003c\/strong\u003e: Internal and External\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Hand\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInternal Pitch\u003c\/strong\u003e: 8 TPI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Angle\u003c\/strong\u003e: 29 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Size\u003c\/strong\u003e: 3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish Coating\u003c\/strong\u003e: AlTiN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating Process\u003c\/strong\u003e: PVD\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: Top Notch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth of Cutting Tip\u003c\/strong\u003e: 0.0476 inches (1.21 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorner Radius\u003c\/strong\u003e: 0.005 inches (0.13 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThickness\u003c\/strong\u003e: 0.1949 inches (4.95 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTip to Top of Insert\u003c\/strong\u003e: 0.1492 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.025 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 23291804\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: KENNAMETAL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 4109644\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"KENNAMETAL","offers":[{"title":"Default Title","offer_id":51748683645234,"sku":"4109644","price":248.73,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/6309b28acc99b6b6ae241890a35e5781_8fca5874-ac51-4494-b49a-0f4d92fb9adf.jpg?v=1788896665","url":"https:\/\/voomisupply.com\/products\/kennametal-4109644-threading-insert-nas3r8-kcu25-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}