Korloy CNMG120404-HM NC3120 High-Performance Steel Turning Insert (10pcs)
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The Original Korloy CNMG120404-HM NC3120 (ANSI Standard: CNMG 431) represents the next generation of high-efficiency steel turning. Engineered with an advanced thick CVD coating, the NC3120 grade is optimized to withstand higher cutting temperatures and resist flank wear more effectively than its predecessors. With the precision-ground 0.4mm (1/64") radius and the legendary HM chipbreaker, this insert provides exceptional chip control and a superior surface finish across a vast array of carbon and alloy steels.
Technology Upgrade: NC3120 utilizes a new coating bonding technology that prevents peeling even at high speeds, providing a 30% longer tool life compared to traditional steel grades.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | CNMG120404-HM |
| ANSI Code | CNMG 431 |
| Grade | NC3120 (New CVD High-Speed Steel Grade) |
| Chipbreaker | HM (Finishing to Medium Cut) |
Core Performance Benefits:
- Superior Red-Hardness: The advanced Alumina coating maintains its hardness at extreme temperatures, allowing for higher SFM (Surface Feet per Minute).
- Excellent Surface Integrity: The 0.4mm nose radius minimizes cutting forces, reducing the risk of vibration and ensuring a bright, high-quality finish.
- Universal HM Geometry: The HM breaker is the industry favorite for its ability to break chips across a wide range of feed rates and depths of cut.
- Maximum Edge Stability: Enhanced coating adhesion prevents micro-chipping at the cutting edge, resulting in high dimensional accuracy part after part.
Recommended Cutting Parameters:
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel (1045 / S45C) | 200 - 380 m/min | 0.08 - 0.25 mm/rev | 0.3 - 3.5 mm |
| Alloy Steel (4140 / SCM440) | 150 - 320 m/min | 0.06 - 0.20 mm/rev | 0.3 - 3.0 mm |
Compatible Tool Holders:
For high-speed precision turning, we recommend rigid D-Type or M-Type holders:
- External Turning: MCLNR/L 2020K12 / MCLNR/L 2525M12
- Precision Boring Bars: S25S-MCLNR12 / S32T-MCLNR12
Steel Grade Upgrade Guide: NC3120 vs. NC3020
Why switch to the new NC3120?
Superior coating bonding. Up to 30% higher wear resistance. The new standard for high-speed steel turning.
The classic reliable choice. Good for general steel work, but being phased out for the more efficient NC3120.
Machinist's Tip: If your machine can handle the RPM, NC3120 thrives at higher cutting speeds, which actually helps in achieving a cleaner chip break.
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.