Korloy TNMG160404-HM PC9030 (TNMG 331-HM) Stainless Steel Turning Insert (10pcs)
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The Original Korloy TNMG160404-HM PC9030 (ANSI: TNMG 331-HM) is a high-performance PVD Coated Triangular Insert specifically engineered for Stainless Steel (M-Group) and Heat-Resistant Alloys. Utilizing the advanced PC9030 PVD Grade, this insert features a super-smooth coating and a tough substrate that effectively prevents Built-Up Edge (BUE)—a common problem in stainless machining. The HM Chipbreaker and 0.4mm precision radius deliver exceptional chip control and fine surface finishes on precision components.
The Stainless Steel Expert: Stainless steel is notorious for its "gummy" nature and work-hardening. PC9030’s specialized PVD coating maintains a sharp cutting edge while resisting the heat and chemical adhesion common in 304, 316, and Duplex stainless steels.
Technical Specifications (Metric & Imperial):
| ISO Designation | TNMG 160404-HM |
| ANSI Designation | TNMG 331-HM |
| 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 (Universal PVD for Stainless & Steel) |
Core Performance Benefits:
- PVD Nano-Coating: Provides extreme lubricity and a sharp edge, crucial for cutting through tough, adhesive stainless fibers.
- Excellent Impact Strength: The tough substrate is ideal for interrupted cuts and unstable machining conditions in stainless steel.
- Precision Tip Control: The R0.4 (331) radius is perfect for fine tolerances and preventing vibration on thin-walled parts.
- Versatile Application: While optimized for M-Group (Stainless), PC9030 also performs brilliantly on P-Group (Steel) during unstable or low-speed cuts.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Stainless Steel (304/316) | 80-180 m/min (260-590 sfm) | 0.05-0.20 mm/rev (.002-.008 ipr) | 0.4-3.0 mm (.016-.118") |
| Alloy Steel (Medium Hard) | 100-220 m/min (330-720 sfm) | 0.10-0.25 mm/rev (.004-.010 ipr) | 0.5-3.5 mm (.020-.138") |
Compatible Tooling Systems:
- External Precision Holders: MTJNR 2020K16 / MTJNR 2525M16 (ANSI 12-4B / 16-4D)
- Stainless Boring Bars: S25S-WTJNR16 / S32T-WTJNR16
Machinist Tip: Why PC9030 for Stainless?
PVD vs CVD for M-Group Materials:
Sharp & Smooth. PVD coatings are thinner and adhere better to sharp edges. This is essential for stainless steel, which requires a "slicing" action to prevent the material from smearing and sticking to the tool.
Avoid for Stainless. While great for steel, CVD coatings like NC3020 are too thick for gummy stainless. Using CVD on 304 stainless often results in "built-up edge" and rapid tool chipping.
Pro Advice: When machining 300-series stainless, always use plenty of high-pressure coolant directed at the cutting edge to evacuate chips quickly and reduce the chance of work-hardening.
Packaging: 10 pieces per box.
TNMG 160404-HM for 304 stainless steel, Korloy PC9030 vs NC3020 for stainless, best carbide inserts for 316 stainless, TNMG 331-HM PVD coated insert specs, stainless steel CNC turning parameters
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.