Korloy TNMX160404L NC3120 (Left Hand) High-Speed Steel Turning Insert (10pcs)
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The Original Korloy TNMX160404L NC3120 is a specialized Left-Hand Triangular Turning Insert engineered for High-Performance Steel Machining (P-Group). Optimized with the NC3120 Grade, this insert features an advanced CVD coating designed to withstand the extreme temperatures of high-speed alloy steel turning. The TNMX geometry provides superior chip evacuation and surface quality, making it an essential tool for precision automotive and machinery components.
Designed for Precision & Endurance: NC3120 is Korloy's premier grade for alloy steel. Its dense coating structure prevents crater wear even during prolonged contact with tough-to-machine steels like 4140, 4340, and pre-hardened tool steels.
Technical Specifications:
| ISO Designation | TNMX 160404L |
| Hand of Tool | Left Hand (L) |
| Inscribed Circle (IC) | 9.525 mm / (3/8") |
| Thickness (S) | 4.76 mm / (3/16") |
| Corner Radius (r) | 0.4 mm / (1/64") |
| Grade | NC3120 (High-Wear Resistant CVD) |
Core Performance Benefits:
- Extended Tool Life: NC3120’s specialized Al2O3 coating layer acts as a thermal barrier, maintaining edge sharpness at high RPMs.
- Superior Surface Finish: The TNMX design allows for excellent chip control, preventing "bird-nesting" and protecting the workpiece surface.
- High Dimensional Stability: Ideal for automated production where frequent offsets are undesirable.
- Specialized Left-Hand Orientation: Specifically designed for back-turning and specialized CNC lathe tool configurations.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Alloy Steel (4140/4340) | 180-330 m/min | 0.08-0.25 mm/rev | 0.3-2.5 mm |
| Carbon Steel (1045) | 200-380 m/min | 0.10-0.30 mm/rev | 0.5-3.0 mm |
Compatible Tool Holders:
Note: Requires Left-Hand (L) or Neutral (N) tool holders designed for 16-size inserts:
- External Holders: MTJNL 2020K16 / MTJNL 2525M16
- Boring Bars: S25S-WTJNL16 / S32T-WTJNL16
Machinist Tip: The NC3120 Advantage
Optimizing your steel turning workflow:
High Speed, Low Wear. This grade is optimized for high-speed finishing where heat is the enemy. It excels in keeping a sharp edge on alloy steels that would normally dull a standard NC3020 insert prematurely.
Ensure your machine's spindle direction (M03/M04) and tool post orientation match the Left-Hand design to take full advantage of the TNMX chipbreaker's geometry.
Pro Advice: For the best results in alloy steel finishing, use a Constant Surface Speed (CSS) to maintain a uniform Vc, ensuring consistent surface finish from the largest to the smallest diameter of your part.
Packaging: 10 pieces per box.
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