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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