Korloy CNMG120412-HM NC3120 Heavy Roughing Turning Insert (10pcs)
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The Original Korloy CNMG120412-HM NC3120 (ANSI Standard: CNMG 433) is a high-performance CVD-coated carbide insert engineered for heavy-duty roughing and high-feed steel turning. As the successor to the legendary NC3020, the NC3120 grade provides significantly improved coating adhesion and heat resistance. With its robust 1.2mm (3/64") nose radius, this insert excels in high metal removal rate (MRR) applications, allowing you to push your machine to its limits while maintaining stable tool life.
Roughing Powerhouse: The R1.2 radius is designed to withstand the highest cutting forces and dissipate heat away from the cutting edge, making it the primary choice for large diameter bars and forged steel components.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | CNMG120412-HM |
| ANSI Code | CNMG 433 |
| Grade | NC3120 (New Flagship CVD Steel Grade) |
| Nose Radius | 1.2 mm (3/64") - Maximum Strength |
Core Performance Benefits:
- Maximum Metal Removal: Specifically designed for large depths of cut and high feed rates, drastically shortening cycle times.
- Advanced CVD Technology: The NC3120 coating offers superior flank wear resistance, maintaining dimensional accuracy even in long continuous cuts.
- Enhanced Thermal Stability: Thrives in high-temperature environments, reducing the risk of plastic deformation during high-speed roughing.
- HM Roughing Geometry: The HM chipbreaker ensures excellent chip control even when moving large volumes of material, preventing "bird-nesting."
Recommended Cutting Parameters:
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Low Carbon Steel (1018/1045) | 180 - 360 m/min | 0.25 - 0.60 mm/rev | 1.5 - 6.5 mm |
| Alloy Steel (4140/SCM440) | 150 - 300 m/min | 0.20 - 0.50 mm/rev | 1.2 - 5.5 mm |
Compatible Tool Holders:
Heavy roughing with R1.2 radius requires maximum rigidity. Use high-performance D-Type or M-Type holders:
- External Turning: PCLNR/L 2525M12 / DCLNR/L 2525M12 / PCLNR/L 3232P12
- Boring Bars (Heavy Duty): S32T-PCLNR12 / S40T-PCLNR12 / S50U-PCLNR12
Steel Shop Guide: NC3120 vs. NC3225
Optimizing your choice for heavy-duty turning:
Best for high-speed continuous roughing on stable machines. Offers the best wear resistance in carbon steel.
Best for interrupted cuts, heavy scale, or older machines with less rigidity. More resistant to chipping.
Machinist's Tip: Due to the 1.2mm radius, you can use a higher feed rate than an R0.8 insert to achieve the same surface finish. Ensure your machine has enough horsepower for deep ap cuts.
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.