Korloy MGMN250-M NC3120 2.5mm Double-Ended Steel Grooving Insert (10pcs)
Price shown is a starting point. Contact us for a precise quote based on your requirements.
The Original Korloy MGMN250-M NC3120 is a specialized 2.5mm Double-Ended Grooving Insert, ideal for applications where a 2.0mm insert lacks rigidity and a 3.0mm insert wastes too much material. Powered by the NC3120 CVD grade, this insert is the ultimate "General Purpose" solution for steel. It is engineered to handle a wide range of cutting conditions, providing reliable performance in both continuous and slightly interrupted cuts in various steel grades.
The Strategic Middle-Ground: The 2.5mm width offers significantly more lateral strength than 2.0mm inserts, reducing "tool walk" and ensuring flatter parting faces on medium-sized bars while optimizing material savings.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | MGMN250-M |
| Insert Width (w) | 2.5 mm |
| Grade | NC3120 (Universal Steel Grade - CVD) |
| Chipbreaker | -M (Standard Stable Geometry) |
Core Performance Benefits:
- Enhanced Rigidity: The 2.5mm body provides a noticeable upgrade in stability over narrower inserts for deeper grooves.
- Universal Grade NC3120: Features a balanced substrate and coating that resists both high-speed wear and mechanical shock.
- Material Efficiency: Perfect for high-cost alloys where every half-millimeter of material saved adds up to significant cost reductions.
- Clean Chip Evacuation: The -M chipbreaker geometry is optimized to prevent chip packing in the groove, ensuring a superior side-wall finish.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) |
|---|---|---|
| Low Carbon/Mild Steel | 130 - 230 m/min | 0.06 - 0.18 mm/rev |
| Alloy Steel (4140/SCM440) | 110 - 190 m/min | 0.05 - 0.14 mm/rev |
| Pre-hardened Steel | 70 - 140 m/min | 0.04 - 0.10 mm/rev |
Compatible Tool Holders:
Designed for use with dedicated 2.5mm MGEHR/L holders:
- External Holders: MGEHR 1616-2.5 / 2020-2.5 / 2525-2.5
Choosing Your 2.5mm Grade: NC3120 vs. NC3030
Match your choice to your specific machining environment:
The Efficient Generalist. Best for CNC machines and automated production. Prioritizes wear resistance and consistent tool life across all common steels.
The Impact Specialist. Choose this if you are cutting through heavy scale, eccentric bars, or facing significant vibrations.
Machinist's Pro Tip: For the MGMN250-M NC3120, ensure your coolant is directed precisely at the cutting edge. 2.5mm grooves can trap heat quickly; good lubrication combined with NC3120's CVD coating will double your tool life.
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.