Korloy TNMG160408-HM NC3120 (TNMG 332-HM) Long-Life Insert for Alloy Steel (10pcs)
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The Original Korloy TNMG160408-HM NC3120 (ANSI: TNMG 332-HM) is a high-performance Triangular Turning Insert engineered for Hardened and Alloy Steel Machining (P-Group). Featuring the specialized NC3120 Grade, this tool offers an optimized CVD coating layer that provides exceptional resistance to high-temperature oxidation and friction. The HM (Medium Cutting) Chipbreaker and robust 0.8mm radius make it the ultimate choice for high-speed production runs on alloy steels, mold steels, and pre-hardened components.
Maximum Wear Resistance: NC3120 is Korloy's answer to the challenges of machining high-strength alloys. It is specifically formulated to minimize "crater wear" and "flank wear" at high cutting speeds, ensuring that your dimensions remain consistent across hundreds of parts without frequent tool changes.
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 | NC3120 (Ultra-High Speed CVD for Alloy Steel) |
Core Performance Benefits:
- Engineered for Alloy Steel: Superior performance on 4140, 4340, 8620, and other high-tensile materials.
- Stable Edge Toughness: The 0.8mm (332) radius handles aggressive feed rates and helps prevent chipping in continuous-to-lightly interrupted cuts.
- Advanced Heat Shield: Thick CVD Al2O3 layer protects the carbide substrate from thermal deformation during high-speed dry machining.
- 6 Cutting Edges: Double-sided triangular design provides the best economic value for industrial production.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Alloy Steel (4140/SCM440) | 160-320 m/min (525-1050 sfm) | 0.15-0.45 mm/rev (.006-.018 ipr) | 0.8-4.0 mm (.032-.157") |
| Tool Steel (H13/D2 Soft) | 120-220 m/min (390-720 sfm) | 0.12-0.35 mm/rev (.005-.014 ipr) | 0.8-3.0 mm (.032-.118") |
Compatible Tooling Systems:
- External Lathe Holders: MTJNR 2020K16 / MTJNR 2525M16 (ANSI 12-4B / 16-4D)
- Heavy Boring Bars: S25S-WTJNR16 / S32T-WTJNR16
Machinist Tip: NC3120 vs. NC3020 Efficiency
When to choose the NC3120 Grade:
The Efficiency King. If your shop processes alloy steels (4140, etc.) in large quantities, NC3120 is worth the upgrade. It withstands higher speeds and provides 20-30% longer life in heat-intensive alloy cutting than NC3020.
For standard mild steel or general maintenance where material types vary hourly, NC3020 is more versatile. NC3120 is a specialized "formula" for those looking for the absolute limit of tool life in alloy steels.
Pro Advice: To maximize the benefits of NC3120, ensure you are using stable workholding. In alloy steel, chatter can lead to micro-chipping; the 0.8mm radius on this model helps dissipate force, but rigidity is still key for high-speed success.
Packaging: 10 pieces per box.
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