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.