{"product_id":"kennametal-4109939-threading-insert-nt2lk-kcu25-carbide","title":"Kennametal 4109939 Threading Insert NT2LK KCU25 Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe KENNAMETAL 4109939 is a carbide threading insert in the Top Notch series, designed for cutting both internal and external threads on a lathe or CNC turning center. Manufactured in a left-hand configuration with a 60-degree partial profile included angle, this insert handles external pitches from 0.70 to 3.00 mm (8 to 36 TPI) and internal pitches from 1.25 to 3.50 mm (7 to 20 TPI). The AlTiN finish is applied via PVD coating, providing heat and oxidation resistance during high-speed threading operations. Insert size is 2, with a corner radius of 0.1 mm (0.0039 inches) and a tip-to-top-of-insert measurement of 0.0752 inches. Machinists and tooling technicians working in production or job-shop environments will find this insert suited to threading a wide range of ferrous and non-ferrous workpieces.\u003c\/p\u003e\n\u003cp\u003eThis insert is intended for use in Top Notch series threading toolholders that accept the NT style, left-hand insert geometry. It supports both internal and external threading applications on manual lathes, CNC turning centers, and multi-axis machining equipment. The K-style chipbreaker promotes controlled chip evacuation during threading passes. Typical applications include producing unified, metric, and 60-degree thread forms across a broad pitch range in production or repair machining environments.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eCarbide substrate with PVD-applied AlTiN finish for elevated heat resistance\u003c\/li\u003e\n  \u003cli\u003eLeft-hand insert orientation for reverse-rotation or back-turning thread applications\u003c\/li\u003e\n  \u003cli\u003e60-degree partial profile supports both internal and external thread cutting in a single insert\u003c\/li\u003e\n  \u003cli\u003eExternal pitch range: 0.70 to 3.00 mm (8 to 36 TPI)\u003c\/li\u003e\n  \u003cli\u003eInternal pitch range: 1.25 to 3.50 mm (7 to 20 TPI)\u003c\/li\u003e\n  \u003cli\u003eK-style chipbreaker for chip control during threading passes\u003c\/li\u003e\n  \u003cli\u003eTop Notch series platform for positive indexing and repeatable tool-edge positioning\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use in Top Notch series threading toolholders accepting NT2 left-hand insert style. Verify toolholder compatibility with the NT insert style and insert size 2 before ordering.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a qualified machinist or tooling technician. Power down and lock out the machine spindle before seating or indexing the insert. Use the appropriate torx or clamp screw driver as specified by the toolholder manufacturer to secure the insert  -  do not overtighten. Inspect the seating pocket for chips or debris before installing a new cutting edge to ensure proper insert contact and repeatable tool-tip positioning.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Style\u003c\/strong\u003e: NT\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\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\u003eThread Standard\u003c\/strong\u003e: Partial Profile 60 Degree\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: Left Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eExternal Pitch Range\u003c\/strong\u003e: 0.70 to 3.00 mm (8 to 36 TPI)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInternal Pitch Range\u003c\/strong\u003e: 1.25 to 3.50 mm (7 to 20 TPI)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIncluded Angle\u003c\/strong\u003e: 60 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChipbreaker\u003c\/strong\u003e: K\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Size\u003c\/strong\u003e: 2\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCorner Radius\u003c\/strong\u003e: 0.1 mm (0.0039 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTip to Top of Insert\u003c\/strong\u003e: 0.0752 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: Top Notch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.004 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 23291804\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: KENNAMETAL\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 4109939\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"KENNAMETAL","offers":[{"title":"Default Title","offer_id":51741273129266,"sku":"4109939","price":227.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/ec6f8025d303736261a889a82bab004d_111f6d67-8884-45e5-bb0b-e9ce1f0b8aad.jpg?v=1788830456","url":"https:\/\/voomisupply.com\/products\/kennametal-4109939-threading-insert-nt2lk-kcu25-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}