Korloy MGMN250-M NC3220 2.5mm Double-Ended Pro-Steel Grooving Insert (10pcs)
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The Original Korloy MGMN250-M NC3220 is the next-generation 2.5mm Double-Ended Grooving Insert specifically developed for High-Performance Steel Machining. Utilizing the advanced NC3220 CVD grade, this insert sets a new benchmark for tool life and reliability in CNC steel parting. It is engineered to bridge the gap between pure wear resistance and high impact toughness, making it the most stable 2.5mm solution for both continuous and general steel cutting operations.
Stability Reinvented: The NC3220 grade features a refined multi-layer coating that excels in heat dissipation. At 2.5mm wide, this insert provides superior rigidity compared to 2.0mm models, ensuring straighter cuts and better surface finish on medium-sized steel parts.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | MGMN250-M |
| Insert Width (w) | 2.5 mm |
| Grade | NC3220 (Advanced Universal Steel - CVD) |
| Main Material | Carbon Steel / Alloy Steel (P Group) |
Core Performance Benefits:
- Enhanced Thermal Resistance: NC3220’s optimized coating prevents edge softening during high-speed, continuous 2.5mm cuts.
- Balanced Substrate: Specifically designed to handle the unpredictable nature of general steel machining without micro-chipping.
- Precision Parting: The -M chipbreaker compresses and guides chips out of 2.5mm grooves efficiently, preventing surface scratches.
- Strategic ROI: Double-ended design doubles your productivity per insert while minimizing material waste compared to 3mm wide tools.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) |
|---|---|---|
| Soft Steel (1020/A3) | 140 - 240 m/min | 0.07 - 0.18 mm/rev |
| Alloy Steel (4140/SCM440) | 110 - 200 m/min | 0.06 - 0.15 mm/rev |
| Carbon Steel (1045) | 120 - 220 m/min | 0.08 - 0.20 mm/rev |
Compatible Tool Holders:
Ensure maximum clamping precision with these 2.5mm dedicated holders:
- External Holders: MGEHR 1616-2.5 / 2020-2.5 / 2525-2.5
The Next-Gen Edge: NC3220 vs. NC3120
NC3220 is the modern evolution of the universal steel grade:
The Advanced All-Rounder. Offers better coating adhesion and heat resistance than NC3120. Ideal for high-efficiency modern CNC lathes.
The Classic Generalist. A proven performer for standard steel grooving, but may wear slightly faster than NC3220 in high-heat continuous cuts.
Machinist's Pro Tip: For the MGMN250-M NC3220, the 2.5mm width is sensitive to center height. To maximize the benefits of the NC3220 grade, ensure the tool is zeroed perfectly. A center deviation of just 0.05mm can increase flank wear and shorten the life of this advanced coating.
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.