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.