Korloy TNMG160404-GS PC9030 (TNMG 331-GS) Stainless Steel Turning Insert (10pcs)
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The Original Korloy TNMG160404-GS PC9030 (ANSI: TNMG 331-GS) is a high-productivity, double-sided Triangular Indexable Insert designed for professional CNC machining of Stainless Steel (M-Group). Featuring 6 usable cutting edges, it offers exceptional cost-per-edge value. The PC9030 PVD Grade is Korloy's premier solution for preventing adhesion, while the GS Chipbreaker is specifically engineered for precision chip control in gummy materials like 304 and 316 stainless.
Global Standard Sizing: Whether you search by ISO (TNMG160404) or ANSI (TNMG 331), this insert is the industry standard for medium-to-finish turning of stainless steel on both metric and imperial lathe systems.
Technical Specifications (Metric & Imperial):
| ISO Designation | TNMG 160404-GS |
| ANSI Designation | TNMG 331-GS |
| Inscribed Circle (IC) | 9.525 mm / (3/8") |
| Thickness (S) | 4.76 mm / (3/16") |
| Corner Radius (r) | 0.4 mm / (1/64") |
| Grade | PC9030 (Premium PVD Coated) |
Core Performance Benefits:
- 6 Cutting Edges: Double-sided triangular design maximizes tool economy for high-volume production.
- Advanced GS Geometry: Optimized for stainless steel finishing, providing sharp cutting action to prevent work-hardening.
- Thermal Stability: The PC9030 grade resists thermal cracking, common in interrupted stainless cuts.
- Universal Compatibility: Fits all standard MTJNR/L, WTJNR/L, and DTJNR/L toolholders.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Stainless (304/316) | 100-210 m/min (330-690 sfm) | 0.10-0.25 mm/rev (.004-.010 ipr) | 0.5-3.0 mm (.020-.118") |
| Duplex Steel | 60-130 m/min (200-425 sfm) | 0.12-0.22 mm/rev (.005-.008 ipr) | 0.5-2.5 mm (.020-.100") |
Compatible Tooling Systems:
- External Turning: MTJNR 2020K16 (MTJNR 12-4B) / MTJNR 2525M16 (MTJNR 16-4D)
- Internal Boring: S25S-WTJNR16 / S32T-WTJNR16
Machinist Tip: TNMG160404 (331) vs TNMG160408 (332)
Choosing the right corner radius for stainless steel:
Best for Finish. The 0.4mm (1/64") radius generates lower cutting pressure, which is critical when turning thin-walled stainless pipes or small diameters where vibration is a concern.
Best for Roughing. The 0.8mm (1/32") radius has a stronger edge. Switch to this if you are performing heavy roughing or dealing with interrupted cuts on cast stainless parts.
Pro Advice: PC9030 is Korloy's #1 selling grade for M-Group materials. For the longest life in 304/316, always use plenty of high-pressure coolant to keep the PVD coating below its oxidation temperature.
Packaging: 10 pieces per box.
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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.