Korloy SNMG120404-HM NC3120 Universal Steel Turning Insert (10pcs)
Price shown is a starting point. Contact us for a precise quote based on your requirements.
The Original Korloy SNMG120404-HM NC3120 is the ultimate "All-Rounder" in the Steel (P-Group) turning category. Precision-engineered with the NC3120 Universal CVD Grade, this insert excels in environments where the machining conditions are unpredictable. Whether you are dealing with continuous cuts or light interruptions, the NC3120 provides a stable and predictable tool life. The -HM (Highly Medium) chipbreaker features a robust edge design that ensures excellent chip breaking across a wide range of feed rates and depths of cut.
The Universal Solution: If you only want to stock one grade for all your carbon and alloy steel jobs, NC3120 is it. It offers better impact resistance than NC3020 and higher wear resistance than NC3030, making it the most cost-effective choice for general job shops.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | SNMG120404-HM |
| Corner Radius | 0.4 mm (Precision & Low Cutting Force) |
| Cutting Edges | 8 Edges (Double-Sided) |
| Grade | NC3120 (Universal CVD Coating) |
Core Performance Benefits:
- Broad Application Range: Covers everything from mild steel to tough alloy steels with a single grade.
- Balanced CVD Technology: A specialized Al2O3 + TiCN coating layer provides excellent heat shield properties while maintaining edge toughness.
- Optimized HM Geometry: The 0.4mm radius paired with the HM chipbreaker allows for precision finishing without sacrificing the ability to take deeper medium cuts.
- Process Reliability: Minimizes unexpected edge chipping, ensuring your CNC machines can run longer with less operator intervention.
Recommended Cutting Parameters (General Steel):
| Material | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel (S45C) | 160 - 320 m/min | 0.15 - 0.40 mm/rev | 1.0 - 4.0 mm |
| Alloy Steel (4140) | 130 - 260 m/min | 0.12 - 0.35 mm/rev | 0.8 - 3.5 mm |
| Mild Steel (A36) | 180 - 350 m/min | 0.15 - 0.45 mm/rev | 1.0 - 4.5 mm |
Compatible Tool Holders:
Precision fit for all standard 12.7mm (1/2") IC negative holders:
- Standard Turning: MSSNR 2020 / 2525 / 3232 Series
- Rigid Boring: S25S-MSSNR12 / S32T-MSSNR12
Machinist Tip: The NC3120 Advantage
How to choose the perfect Korloy grade for your project:
Universal Performance. The best choice for general job shops. It handles variations in material hardness and light interruptions better than NC3020.
Specialized Performance. Switch to NC3020 for maximum speed in long-run continuous cuts. Switch to NC3030 for heavy, violent interruptions or forged skins.
Pro Advice: If you are unsure which grade to start with, NC3120 is the safest bet. For SNMG120404-HM, ensure your feed rate is at least 0.15mm/rev to activate the chipbreaker and prevent "bird nesting" (stringy chips).
Packaging: 10 pieces per box.
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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.