Korloy CNMG120408-HM NC3120 High-Speed Steel Roughing Insert (10pcs)
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The Original Korloy CNMG120408-HM NC3120 (ANSI Standard: CNMG 432) is a next-generation CVD-coated carbide insert specifically engineered for high-efficiency turning of steel. The NC3120 grade features Korloy's latest coating technology, which offers superior thermal stability and 30% more wear resistance than previous generations. With the versatile 0.8mm (1/32") nose radius and the legendary HM chipbreaker, this insert is the industry's top choice for high-volume production of carbon and alloy steel parts.
Modern Workshop Standard: NC3120 is designed to thrive at higher RPMs, reducing cycle times while maintaining a stable cutting edge—perfect for modern CNC machines.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | CNMG120408-HM |
| ANSI Code | CNMG 432 |
| Grade | NC3120 (Advanced CVD High-Speed Steel) |
| Nose Radius | 0.8 mm (1/32") - High Strength |
Core Performance Benefits:
- Exceptional Red-Hardness: The thick Alumina (Al2O3) coating allows for significantly higher cutting speeds without the edge softening.
- Robust R0.8 Edge: Provides the structural strength needed for aggressive feed rates and heavy material removal.
- Universal HM Chipbreaker: Known for its wide application range, effectively managing chip evacuation in both medium and roughing depths of cut.
- Economic 4-Edge Design: Double-sided negative geometry provides 4 usable edges, optimizing your tooling cost-per-part.
Recommended Cutting Parameters:
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel (1045 / S45C) | 200 - 380 m/min | 0.15 - 0.45 mm/rev | 1.0 - 5.0 mm |
| Alloy Steel (4140 / SCM440) | 150 - 320 m/min | 0.12 - 0.35 mm/rev | 0.8 - 4.5 mm |
Compatible Tool Holders:
To maximize the productivity of your CNMG 432 inserts, use rigid D-Type or M-Type tool holders:
- External Turning: MCLNR/L 2020K12 / MCLNR/L 2525M12 / MCLNR/L 2525M12
- Internal Boring Bars: S32T-MCLNR12 / S40T-MCLNR12
Steel Finishing Guide: NC3120 vs. NC3225
Choosing the right upgrade for your production:
Optimized for high speeds and continuous cuts. The "productivity king" for stable steel turning.
Best for interrupted cuts and unstable machines. Use this if you experience frequent chipping.
Machinist's Tip: When moving from NC3020 to NC3120, you can often increase your cutting speed (Vc) by 15-20% without losing tool life.
Packaging: 10 pieces per box.
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.