Korloy TNMG160404-HM NC3030 (TNMG 331-HM) Tough Steel Turning Insert (10pcs)
Price shown is a starting point. Contact us for a precise quote based on your requirements.
The Original Korloy TNMG160404-HM NC3030 (ANSI: TNMG 331-HM) is a high-toughness Triangular Turning Insert specifically engineered for Steel Machining (P-Group) under unstable conditions. Featuring the specialized NC3030 CVD Coating, this insert provides industry-leading resistance to chipping and thermal shock. The HM (Medium Cutting) Chipbreaker with its 0.4mm corner radius is the ideal solution for precision turning on workpieces with interrupted surfaces, such as shafts with keyways or hex bolts.
Built for the Tough Jobs: Unlike general-purpose grades that may crack during interrupted cuts, the NC3030 grade features a reinforced substrate that absorbs impact. It is your best insurance policy against sudden edge failure when machining rough or uneven steel surfaces.
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 | NC3030 (Impact Resistant CVD for Steel) |
Core Performance Benefits:
- Maximum Toughness: Specialized substrate prevents fracture during heavy-duty interruptions or fluctuating loads.
- Advanced CVD Coating: Thick Al2O3 layer ensures tool longevity by resisting heat buildup, even during dry machining.
- Precision Tip: The 0.4mm (331) radius allows for detailed semi-finishing and fine tolerances in unstable setups.
- Multi-Edge Economy: 6 cutting edges (3 per side) provide exceptional cost-per-part efficiency.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Interrupted Steel (1045/4140) | 120-220 m/min (390-720 sfm) | 0.08-0.25 mm/rev (.003-.010 ipr) | 0.4-3.0 mm (.016-.118") |
| Low Rigid Setup (Steel) | 140-240 m/min (460-785 sfm) | 0.10-0.30 mm/rev (.004-.012 ipr) | 0.5-3.5 mm (.020-.138") |
Compatible Tooling Systems:
- External Precision Holders: MTJNR 2020K16 / MTJNR 2525M16 (ANSI 12-4B / 16-4D)
- Internal Boring Bars: S25S-WTJNR16 / S32T-WTJNR16
Machinist Tip: NC3020 vs. NC3030
Choosing the right grade for your steel job:
Best for Interrupted Cuts. Choose this grade for shafts with holes, hex shapes, or when the machine/workpiece lacks rigidity. It favors toughness over raw speed.
Best for Continuous Cuts. If your cut is stable (round bar, no gaps), NC3020 will offer higher wear resistance and allow for faster cutting speeds.
Pro Advice: When dealing with interruptions, use plenty of coolant to prevent thermal cracking, and slightly reduce your cutting speed (Vc) compared to continuous cutting to protect the cutting edge from impact fatigue.
Packaging: 10 pieces per box.
TNMG 160404-HM for interrupted cutting, Korloy NC3030 vs NC3020 grade, best carbide inserts for unstable steel parts, TNMG 331-HM impact resistant insert, CNC turning inserts for interrupted steel lathe work
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.