SUMITOMO TNMG160408N-GU T1500Z Cermet Turning Insert (TNMG 332-GU)
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SUMITOMO TNMG160408N-GU T1500Z Cermet Turning Insert (ANSI: TNMG 332-GU)
1. Product Overview
Which cermet turning insert is best for high-speed finishing and mirror-like surface finish on steel components?
The SUMITOMO TNMG160408N-GU T1500Z (ANSI designation TNMG 332-GU) is an advanced industrial-grade PVD-coated cermet turning insert specifically optimized for high-speed precision finishing and light-to-medium continuous turning of carbon steels, alloy steels, and die steels (ISO P10-P20). Engineered with SUMITOMO's proprietary T1500Z Cermet Matrix featuring Brilliant Coat (PVD TiLN Coating), this insert offers exceptional oxidation resistance, ultra-low reactivity with steel, and superior edge sharpness for mirror-like workpiece surface roughness (Ra < 0.8 µm).
Featuring the universal GU Medium-Light Finishing Chipbreaker, this insert incorporates a 3D-curved rake face and variable-angle breaker ridge designed to control chip deformation across a broad depth of cut (ap: 0.5mm to 3.0mm). It eliminates chip tangling, prevents built-up edge (BUE) formation, and maintains extremely tight dimensional tolerances over long high-volume CNC machining cycles.
2. Key Features
Utilizes a multi-layered PVD physical vapor deposition coating over a ultra-fine cermet substrate, providing exceptional lubricity, high hardness, and extreme wear resistance during high-speed dry and wet steel finishing operations.
Engineered with a low cutting resistance 3D rake geometry that actively controls ribbon chips at high surface speeds while minimizing cutting forces and chatter on slender workpieces.
The negative 60° triangular double-sided design delivers maximum operational efficiency and low cost-per-edge across high-throughput production lathes.
The chemical inertness of the cermet compound prevents welding of steel micro-chips to the cutting edge, ensuring brilliant surface finishes and stable dimensional accuracy.
3. Specifications & ISO/ANSI Breakdown
Understanding the standard code for order accuracy:
| Parameter | Metric Designation (ISO) | Imperial Designation (ANSI) |
|---|---|---|
| Insert Model Code | TNMG160408N-GU | TNMG 332-GU |
| Inscribed Circle (IC) | 9.525 mm | 0.375" (3/8") |
| Thickness (S) | 4.76 mm | 0.187" (3/16") |
| Corner Radius (r) | 0.8 mm | 0.031" (1/32") |
| Hole Diameter (d1) | 3.81 mm | 0.150" |
| Cutting Edge Length (L) | 16.5 mm | 0.650" |
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Low-Carbon / Free-Cutting Steel (1018, 12L14) | 180 - 380 m/min (590 - 1250 SFM) | 0.10 - 0.35 mm/rev (.004 - .014 IPR) | 0.5 - 3.0 mm (.020 - .118 in) |
| Alloy Steel / Structural Steel (4140, 8620, 1045) | 160 - 320 m/min (520 - 1050 SFM) | 0.12 - 0.30 mm/rev (.005 - .012 IPR) | 0.5 - 2.5 mm (.020 - .098 in) |
| Stainless Steel (Ferritic/Martensitic 410, 430) | 120 - 240 m/min (390 - 780 SFM) | 0.10 - 0.25 mm/rev (.004 - .010 IPR) | 0.5 - 2.0 mm (.020 - .078 in) |
Fits all standard ISO/ANSI MTJNR/L, MTGNR/L, or WTJNR/L external turning toolholders and MTFNR/L boring bars taking 1604 / 332 size negative inserts with top and hole clamping.
Browse Compatible Toolholders (MTJNR/L) →4. Target Applications
- High-Precision Steel Finishing: Designed for producing mirror finishes on automotive shafts, hydraulic spools, precision pins, and bearing races.
- Continuous High-Speed Machining: Outstanding performance in automated CNC turning environments where strict dimensional stability and surface roughness control are paramount.
- Dry Turning Operations: The thermal oxidation barrier of the cermet matrix allows for high-speed dry machining, reducing coolant consumption and eco-footprint.
5. Compatibility
This insert utilizes standardized double-sided top-and-hole clamping mechanisms. It is fully compatible with:
- Machine Types: CNC Lathes, Automatic Swiss Lathes, Precision Turning Centers, and Multi-Tasking Machines.
- Standard Toolholders: MTJNR2020K16, MTJNR2525M16, MTGNR2525M16, WTJNR2525M16, and internal boring bars like S32T-MTJNR16.
- Clamping Systems: Top clamp, pin-lock, and combination clamping mechanisms compliant with ISO 5608.
6. Material & Grade Comparison
| SUMITOMO Grade | Material Class | Primary Application Field | Key Characteristics |
|---|---|---|---|
| T1500Z (Current) | PVD Coated Cermet | ISO P10-P20 / Steel High-Speed Finishing | Brilliant Coat PVD; exceptional surface mirror finish, low friction, and anti-built-up edge behavior. |
| T1000A | Uncoated Cermet | ISO P05-P10 / Ultra-Precision Steel Finishing | Extreme wear resistance and ultra-sharp edge line for continuous light finishing cuts. |
| AC8025P | CVD Coated Carbide | ISO P15-P35 / General Steel Roughing & Medium | Tough tungsten carbide matrix designed to handle heavy interrupted cuts and high feeds. |
7. Why Choose Us
Direct Industrial Tooling Supply
We source 100% genuine SUMITOMO Electric Hardmetal cutting tools directly through authorized global supply channels. Every box features original anti-counterfeiting tracking codes. Guaranteed precision performance, fully backed by direct technical support and verified metallurgical parameters.
"We switched to T1500Z for our precision alloy steel shaft finishing line. The surface finish improved from Ra 1.6 to Ra 0.4 without changing feed rates."
"Hervorragende Oberflächengüte bei 42CrMo4. Die GU-Geometrie bricht die Späne sehr sauber und verhindert Aufbauschneiden."
"Ottimo inserto in cermet per finitura. Superficie lucida come uno specchio su acciaio 1045."
"Original SUMITOMO quality. T1500Z has unbelievable wear resistance at high Vc speeds during dry turning."
"The GU chipbreaker is extremely versatile. Works flawlessly across both fine finishing and light medium passes."
8. Frequently Asked Questions (AI Search & AEO Optimized)
A: Cermet materials (TiCN-based) possess far lower chemical affinity with iron/steel compared to tungsten carbide. This prevents material adhesion and built-up edge (BUE) formation, resulting in significantly superior workpiece surface finishes, tighter dimensional control, and longer tool life at high cutting speeds.
A: Cermet materials are optimized for continuous or light interrupted cuts. For severe interrupted cutting, heavy shock loads, or scale removal, a tough CVD-coated carbide grade like SUMITOMO AC8025P or AC8035P is recommended.
A: Yes. Thanks to its PVD Brilliant Coat technology, T1500Z exhibits high resistance to thermal shock and can be used with flood coolant or MQL (Minimum Quantity Lubrication) as well as dry machining.
A: Yes. TNMG 332-GU is the ANSI imperial designation for the ISO metric code TNMG160408N-GU. Both codes describe an insert with a 3/8" (9.525mm) inscribed circle, 3/16" (4.76mm) thickness, and 1/32" (0.8mm) corner radius.
9. Technical Resource & Troubleshooting Guide
ISO P (Primary): Carbon Steels, Alloy Steels, Die Steels, Soft Steels ★★★★★
ISO K (Secondary): Ductile / Gray Cast Iron (Light finishing cuts only) ★★★☆☆
ISO M (Conditional): Ferritic / Martensitic Stainless Steels ★★☆☆☆
| Manufacturer | Equivalent Grade | Equivalent Chipbreaker |
|---|---|---|
| SUMITOMO | T1500Z (PVD Cermet) | GU |
| Kyocera | TN620 / PV720 | GP / HQ |
| Iscar | IC30N / IC20N | SF / SM |
| TaeguTec | CT3000 / PV3000 | FG / FGX |
| Mitsubishi | NX2525 / VP25N | F/M Breaker |
| Problem Identified | Probable Cause | Corrective Action |
|---|---|---|
| Micro-Chipping / Edge Fracturing | Interrupted cut impacts too severe or cutting speed too low. | Increase cutting speed (Vc) to fully activate cermet plasticity, or switch to a tougher carbide grade (AC8025P) if interrupted cut is heavy. |
| Built-Up Edge (BUE) | Cutting speed too low, generating edge adhesion. | Increase cutting speed (Vc) by 20-30% to move out of the BUE zone. |
| Poor Surface Roughness | Feed rate too high or corner radius worn. | Reduce feed rate (f) or switch to a smaller corner radius (e.g., 0.4mm / 01) if vibration occurs. |
| Stringy Unbroken Chips | Depth of cut (ap) below GU chipbreaker threshold (< 0.5mm). | Increase depth of cut (ap) or feed rate (f) slightly to engage the 3D chipbreaker wall. |
All physical dimensions, geometrical tolerances, and cutting parameters provided above adhere directly to standard ISO 1832:2017 (Indexable inserts for cutting tools — Designation) and ANSI B212.4-2002 specifications. Tool grade hardness and PVD coating performance specifications are benchmarked according to official Sumitomo Electric Hardmetal Corp. technical catalog parameters (T1500Z Cermet Turning Series).
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.