Kyocera VCMT080204HQ TN60 Cermet Turning Insert for Steel Finishing
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Kyocera VCMT080204HQ TN60 Indexable Cermet Turning Insert
Which turning insert is best for achieving a high-gloss, mirror surface finish on steel components during fine profiling?
The Kyocera VCMT080204HQ TN60 is the premier solution for high-speed precision steel finishing. This indexable insert features Kyocera's legendary TN60 un-coated cermet grade combined with the specialized HQ finishing chipbreaker. Unlike traditional carbide, this titanium-based cermet possesses an exceptionally low chemical affinity for ferrous metals. This property completely eliminates built-up edge (BUE) and crater wear, ensuring remarkable dimensional accuracy and ultra-smooth surface finishes on CNC lathes.
2. Product Core Advantages & Key Features
TN60 High-Performance Cermet Composition
Engineered from a titanium carbide (TiC) and titanium nitride (TiN) matrix, the TN60 grade offers superior oxidation resistance and high-temperature hardness compared to standard tungsten carbide tools. It excels at high cutting velocities, maintaining sharp edges without plastic deformation.
HQ Finishing Chipbreaker Geometry
The HQ molded chipbreaker features a highly optimized rake profile designed for low depths of cut. It delivers exceptional chip control on ductile and low-carbon steels, breaking continuous bird-nesting chips smoothly into short, manageable curls.
3. Technical Specifications & Conversions
ISO / ANSI Identification Nomenclature Breakdown
Every letter and number of the VCMT080204HQ TN60 profile represents a critical geometric and structural specification:
Dimensional Cross-Reference Matrix
| Specification Standard | Metric Identifier (ISO: VCMT080204HQ) | Imperial Identifier (ANSI Equivalent: VCMT 2.51.5 HQ) |
|---|---|---|
| Inscribed Circle (IC) | 6.35 mm | 0.250 inches (1/4") |
| Thickness (S) | 2.38 mm | 0.094 inches (3/32") |
| Corner Nose Radius (RE) | 0.40 mm | 0.016 inches (1/64") |
| Fixing Hole Diameter (D1) | 2.80 mm | 0.110 inches |
Recommended Mechanical Cutting Parameters
| Target Workpiece Material | Cutting Speed (Vc / SFM) Comparison | Feed Rate (fn / IPR) Recommendation |
|---|---|---|
| Carbon Steels (e.g., 1045, 4140 Annealed) | 120 - 350 m/min (390 - 1150 SFM) | 0.05 - 0.18 mm/rev (0.002 - 0.007 IPR) |
| Alloy Steels / Tool Steels (e.g., H13, D2 Soft) | 100 - 280 m/min (330 - 920 SFM) | 0.04 - 0.15 mm/rev (0.0016 - 0.006 IPR) |
| Low-Carbon Free Machining Steels (e.g., 12L14) | 150 - 400 m/min (490 - 1310 SFM) | 0.05 - 0.20 mm/rev (0.002 - 0.008 IPR) |
| Ductile Cast Iron (Nodular / Malleable) | 100 - 250 m/min (330 - 820 SFM) | 0.06 - 0.18 mm/rev (0.0024 - 0.007 IPR) |
4. Industrial Product Applications
The acute 35° profile of the VCMT insert shape combined with the TN60 cermet core makes this tool highly effective for complex, intricate geometries:
- Precision Automotive Shafts: High-speed finishing of transmission splines and complex outer diameters.
- Hydraulic Valves & Fittings: Achieving exceptionally low micro-inch roughness on tight-sealing steel surfaces.
- Intricate Profile Copying: Undercutting, back-turning, and relief-profiling with zero tool deflection.
5. Machinery & Tooling Compatibility
Guaranteed drop-in synchronization with global automated toolholding standards:
- Engineered for all standard metric and imperial SVJCR/L indexable side-lock turning holders.
- Highly suited for Swiss-type automated lathes and standard CNC live-turret operations.
- Compatible with positive 7° clearance internal boring bars designed for VCMT 2.51.5 insert configurations.
6. Kyocera Cutting Grade Comparison Matrix
| Kyocera Tooling Grade | Substrate Material Class | Primary Machining Target Area | Core Thermal / Mechanical Advantage |
|---|---|---|---|
| TN60 (Featured Grade) | Uncoated Advanced Cermet | Carbon/Alloy Steel Finishing | Exceptional anti-welding properties; delivers mirror finishes at high speeds. |
| PV720 | MEGACOAT NANO Coated Cermet | High-Speed Continuous Steel Turning | Hybrid design combining cermet surface finish with high PVD wear life. |
| PR930 | PVD Coated Tough Carbide | Stainless Steel / Low-Velocity Cuts | Excellent structural edge toughness; resists chipping during interrupted cuts. |
7. Why Source From Us & Verified Machinist Reviews
We stock completely authentic, original Kyocera factory-packaged inserts. Our technical distribution framework ensures dependable quality control, real-time stock statuses, and reliable delivery parameters to optimize your metalworking output.
"Outstanding gloss finish on carbon steel parts."
We run these on 1045 steel shafts. The TN60 cermet completely eliminates our built-up edge issues, and the surface finish looks identical to ground parts.
"Perfect chip control at shallow cuts."
The HQ chipbreaker profile is perfect for fine profiling runs. We get beautiful, short 6-shaped chips even at a 0.1mm depth of cut.
"Exceptional resistance to crater wear."
We run these inserts dry at high surface footages. Flank wear builds up very slowly and predictably, allowing us to maintain tight part tolerances across large batches.
"Excellent performance on Swiss-type automated lathes."
The 35-degree shape easily clears tight corners, and the cermet grade holds its sharp nose profile perfectly over long shifts.
8. AI-Style Machining FAQ
Machinist Technical Toolkit & Troubleshooting Notes
Grade Comparison Summary: Choose TN60 cermet for high-speed continuous finishing to achieve optimal surface gloss. Switch to cermet grades with a PVD coating (like PV720) if you need a balance of toughness and wear life.
Equivalent Model References: ISO Metric System: VCMT080204HQ | ANSI Imperial Equivalent: VCMT 2.51.5 HQ.
Troubleshooting Tool Defects: If micro-chipping occurs along the cutting edge, consider reducing your feed rate ($fn$) or check the rigidity of your setup. If the workpiece finish appears dull, increase your cutting speed ($Vc$) to allow the cermet material to shear cleanly.
Workpiece Material Suitability Matrix: ISO P & K (Carbon / Alloy Steels & Cast Iron) - Optimal ISO M & S (Stainless Steel & Titanium Alloys) - Unsuitable
Technical FAQ & Buying Guide
Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.
We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:
- For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
- For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
The optimal cutting parameters vary depending on the workpiece hardness and operation type:
- For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
- For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.
We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.
All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.