Korloy TNMG160408-HM PC9030 (TNMG 332-HM) Stainless Steel Turning Insert (10pcs)
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The Original Korloy TNMG160408-HM PC9030 (ANSI: TNMG 332-HM) is a premier PVD Coated Triangular Turning Insert meticulously designed for Stainless Steel (M-Group) and Heat-Resistant Super Alloys (S-Group). Featuring the high-performance PC9030 PVD Grade, this insert provides a smooth, sharp edge that effectively counteracts the "gummy" nature of stainless steel. The HM Chipbreaker combined with a robust 0.8mm corner radius ensures superior chip breaking and edge reliability during medium-duty machining.
High Performance in Adhesive Materials: Stainless steels like 304 and 316 are prone to Built-Up Edge (BUE). PC9030’s advanced PVD coating reduces chemical affinity between the tool and the workpiece, ensuring clean cuts, extended tool life, and exceptional surface integrity.
Technical Specifications (Metric & Imperial):
| ISO Designation | TNMG 160408-HM |
| ANSI Designation | TNMG 332-HM |
| Inscribed Circle (IC) | 9.525 mm / (3/8") |
| Thickness (S) | 4.76 mm / (3/16") |
| Corner Radius (r) | 0.8 mm / (1/32") |
| Grade | PC9030 (Universal PVD Specialist) |
Core Performance Benefits:
- PVD TiAlN Nano-Coating: Excellent thermal stability and surface smoothness to prevent chip welding.
- Optimized HM Geometry: Specifically tuned for medium cutting, providing a balance between cutting force and chip control.
- Enhanced Edge Toughness: The 0.8mm (332) radius handles deeper cuts and provides high resistance to mechanical shock and vibration.
- Versatility: While king of the M-group, it is also a powerful problem-solver for carbon steels in low-speed or unstable setups.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Austenitic (304/316) | 100-200 m/min (330-650 sfm) | 0.15-0.35 mm/rev (.006-.014 ipr) | 0.8-3.5 mm (.032-.138") |
| Duplex Stainless Steel | 60-120 m/min (200-390 sfm) | 0.15-0.30 mm/rev (.006-.012 ipr) | 0.8-3.0 mm (.032-.118") |
Compatible Tooling Systems:
- Standard External Holders: MTJNR 2020K16 / MTJNR 2525M16 (ANSI 12-4B / 16-4D)
- Rigid Boring Bars: S25S-WTJNR16 / S32T-WTJNR16
Machinist Tip: Mastering Stainless Cuts
Optimizing the TNMG160408-HM PC9030:
The Safe Choice. PC9030 is designed for a broad window of speeds. If you are experiencing vibration or inconsistent material quality, PC9030 provides the necessary toughness to keep the edge intact.
If you are performing heavy interruptions or turning extremely tough Duplex alloys at low speeds, the PC9035 grade (extra toughness) might be required. For 90% of stainless jobs, PC9030 (this model) is the superior balance.
Pro Advice: The 0.8mm radius is the best "general purpose" size. However, ensure you maintain a feed rate (fn) at least 1/3 of the corner radius (approx. 0.25mm/rev) to ensure the chipbreaker engages correctly and keeps heat away from the workpiece.
Packaging: 10 pieces per box.
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