Korloy SNMG120404-HM NC3020 Steel Turning Insert for Medium Machining (10pcs)
Price shown is a starting point. Contact us for a precise quote based on your requirements.
The Original Korloy SNMG120404-HM NC3020 is a heavy-duty Double-Sided Square Turning Insert engineered for high-efficiency Steel (P-Group) machining. Utilizing the advanced NC3020 CVD Coating technology, this insert offers exceptional heat resistance and flank wear resistance, making it ideal for high-speed continuous cutting. The -HM (Medium-Roughing) chipbreaker is designed with a strong land area to withstand high cutting forces while ensuring smooth chip evacuation in carbon steels and alloy steels.
Maximize Metal Removal: NC3020 is Korloy's premier grade for general steel turning. The CVD coating allows you to push the cutting speed (Vc) higher than PVD grades, significantly reducing cycle times in mass production environments.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | SNMG120404-HM |
| Corner Radius | 0.4 mm (Precision & Efficiency) |
| Edges | 8 Usable Cutting Edges |
| Grade | NC3020 (Gold-Standard CVD for Steel) |
Core Performance Benefits:
- Enhanced Thermal Stability: Multi-layer CVD coating protects the carbide substrate from crater wear during high-temperature dry cutting.
- Strong Edge Profile: The HM chipbreaker is optimized for medium-to-heavy depths of cut, providing stability against edge chipping.
- 8-Corner Economy: Dramatically lower your cost-per-edge compared to positive inserts.
- Versatile Steel Coverage: Excellent performance across mild steel (A36), carbon steel (S45C), and alloy steels (4140).
Recommended Cutting Parameters (Steel Machining):
| Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Low Carbon Steel | 180 - 350 m/min | 0.15 - 0.40 mm/rev | 1.0 - 4.0 mm |
| Carbon Steel (1045) | 150 - 300 m/min | 0.15 - 0.35 mm/rev | 1.0 - 4.5 mm |
| Alloy Steel (4140) | 120 - 250 m/min | 0.12 - 0.30 mm/rev | 0.8 - 3.5 mm |
Compatible Tool Holders:
Precision matched for 12.7mm IC negative tool holders:
- External Turning: MSSNR 2020 / 2525 / 3232 Series
- Boring Bars: S32T-MSSNR12 / S40U-MSSNR12
Machinist Tip: NC3020 vs. PC5300 for Steel
Choosing the right grade for your steel turning job:
The Speed King. Use NC3020 for stable, high-speed production on carbon steel. The CVD coating is thicker and survives the heat of dry, high-speed turning much better than PVD.
The Tough Fighter. Choose PC5300 if you have heavy interruptions, low RPM, or unstable machines. PC5300 is tougher against edge chipping but will wear faster at high speeds.
Pro Advice: For SNMG120404-HM NC3020, the best results are achieved when the depth of cut ($ap$) is at least 3x the feed rate. This engages the chipbreaker properly to ensure those perfect "C" shaped 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.