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Widia CNMG1906125 TN4000
Widia CNMG1906125 TN4000 is a high-toughness, CVD-coated turning insert (ISO CNMG, 19.05 mm IC, 1.2 mm corner radius) designed to handle medium to heavy cuts in steel, stainless steel & cast iron. Great for applications where reduced tool changes & stable finishes matter.
The Widia CNMG1906125 TN4000 carbide turning insert offers best-in-class durability and reliability for demanding machining tasks. Built with a robust carbide substrate enriched in cobalt, and finished with a CVD multilayer coating (including layers such as TiN/TiCN/Al₂O₃ or equivalent per Widia’s TN4000 specs), it resists wear and edge chipping especially under heavy, interrupted cuts.
With ISO CNMG geometry, 19.05 mm inscribed circle, 6.35 mm thickness, and a 1.2 mm corner radius, it maintains rigidity and stability. It is ideal for turning operations (outer diameter, inner diameter) on steel, stainless steel and cast iron materials. Because it maintains sharpness and resists flank wear, machining results are consistent — fewer tool changes, less downtime, better finishes.
Choose this insert when you need high material removal rates, reliable performance in roughing, and cost savings per component. Great for automotive, aerospace, die & mold, and general engineering shops needing heavy duty turning inserts. CNC Tools Depot stocks authentic Widia TN4000 inserts — DM / WhatsApp / Call us for pricing, lead time & bulk orders.
Hook / Attention Line
“Cut more parts, spend less downtime — Widia CNMG1906125 TN4000 delivers longer tool life and high‐material removal, reducing your cost per component dramatically!”
Key Features & Specs
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Geometry: ISO negative rhombic shape C-style, CNMG insert with IC (Inscribed Circle) size ~19.05 mm, thickness ~6.35 mm, corner radius 1.2 mm.
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Grade & Coating: TN4000 — a tough, CVD-coated carbide substrate with cobalt-enriched top layer, built for strength under heavy cuts and intermittent / roughing operations.
Cutting Applications: Optimized for turning (OD/ID), especially for steel, stainless steel, cast iron; good for medium to heavy cuts, interrupted cuts etc. (though not for milling/drilling) using CNMG geometry.
Why It’s a Best Seller
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Less downtime: With its toughness, the TN4000 grade resists edge chipping and wear even under harder / interrupted cuts.
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Better surface finish: Because the edge remains sharper longer, finishes are more consistent, less rework.
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High wear resistance: The multilayer/coated carbide substrate (with cobalt enrichment) means superior resistance to flank wear and crater wear when machining steel/stainless.
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Cost-per-part falls: You replace inserts less frequently, maintain stable feed/speed, reduce tool changeover – all adding up to real savings.
Application Industries
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Automotive (engine blocks, shaft turning, transmission components)
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Aerospace (steel & stainless components requiring precision and durability)
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Die & Mold (for roughing stock, stainless dies)
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General engineering (machinery parts, shafts, pipes)
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Frequently Asked Questions
The TN4000 grade is optimized for machining steel, stainless steel, and cast iron. It handles medium to heavy duty turning, especially in roughing or interrupted cuts.
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ISO designation: CNMG190612-5
Inscribed Circle (IC): ~19.05 mm -
Thickness (S): ~6.35 mm
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Corner Radius (r): 1.2 mm
TN4000 is tougher and built for heavy cuts / roughing; finish-grade inserts (with finer coatings/less robust substrate) will give better surface finish under lighter cuts but will wear faster under load. If your priority is productivity and durability, TN4000 gives better tool life and lower overall cost.
Yes — thanks to its cobalt-enriched substrate and strong coating, it resists edge chipping from rough or interrupted cuts. This is one of its advantages that many shops appreciate.
Fewer tool changes (reduced downtime), lower scrap / fewer rejects due to more consistent edge, better wear resistance so longer life, and thus lower cost per finished component. In high volume turning of steel or stainless, these savings can be significant.
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