Korloy CNMG120404-HM NC3020 General Steel Turning Insert (10pcs)
Price shown is a starting point. Contact us for a precise quote based on your requirements.
The Original Korloy CNMG120404-HM NC3020 (ANSI Standard: CNMG 431) is the industry's go-to solution for general-purpose steel turning. Engineered for efficiency and reliability, the NC3020 grade features a balanced CVD coating that provides excellent wear resistance at higher cutting speeds. With the 0.4mm (1/64") nose radius and the versatile HM chipbreaker, this insert is perfect for achieving precision dimensions and a high-quality surface finish on a wide range of carbon and alloy steels.
Best for Continuous Cuts: NC3020 is optimized for stable machining conditions, offering higher red-hardness than the NC3030 series for faster cycle times.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | CNMG120404-HM |
| ANSI Code | CNMG 431 |
| Grade | NC3020 (General CVD Steel Grade) |
| Chipbreaker | HM (Semi-Finishing to Medium Cut) |
Core Performance Benefits:
- Optimized Wear Resistance: The advanced CVD coating is tailored to resist flank wear, ensuring long tool life in continuous steel turning.
- Precision Geometry: The 0.4mm radius allows for fine finishing and precise corner control, ideal for parts with strict tolerance requirements.
- Versatile HM Breaker: Provides stable chip control across various feed rates, preventing chip bird-nesting and workpiece scratching.
- Economic 4-Edge Design: Double-sided negative geometry provides 4 usable edges, significantly reducing your cost-per-part.
Recommended Cutting Parameters:
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel (1018/1045) | 180 - 350 m/min | 0.10 - 0.35 mm/rev | 0.5 - 4.0 mm |
| Alloy Steel (4140/SCM440) | 150 - 300 m/min | 0.08 - 0.30 mm/rev | 0.5 - 3.5 mm |
Compatible Tool Holders:
Ensure maximum stability by using standard D-Type or M-Type holders:
- External Turning: PCLNR/L 2020K12 / PCLNR/L 2525M12
- Boring Bars (Internal): S25S-PCLNR12 / S32T-PCLNR12
Steel Grade Selection: NC3020 vs. NC3030
Which Korloy grade is right for your shop?
Higher wear resistance. Best for high-speed continuous cutting and stable setups where efficiency is the priority.
Higher fracture toughness. Best for interrupted cuts, heavy scale, or unstable machines.
Machinist's Tip: If your current insert is wearing out too fast on the flank, upgrade to NC3020 to benefit from its superior abrasive wear resistance.
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.