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.
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