Korloy MRMN250-M NC3030 2.5mm Full Radius R1.25 Steel Profiling Insert (10pcs)
Price shown is a starting point. Contact us for a precise quote based on your requirements.
The Original Korloy MRMN250-M NC3030 is a high-performance 2.5mm Full Radius (R1.25) Profiling Insert specifically designed for Steel (P) machining under challenging conditions. Featuring the tough NC3030 CVD coating, this insert is optimized for interrupted cuts and environments where vibration or machine stability is a concern. The Full Radius (Round Nose) geometry combined with the -M (Medium) chipbreaker ensures reliable chip control and superior edge security during complex 3D contouring of carbon and alloy steels.
Stability Meets Precision: The 2.5mm width provides enhanced structural rigidity compared to 2mm models, while the NC3030 grade offers the thermal shock resistance necessary for wet/dry cycles and uneven surfaces. It is the "safety first" choice for profiling tough steel workpieces.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | MRMN250-M |
| Insert Shape | Full Radius (Round Nose) |
| Width / Radius | 2.5 mm / R1.25 |
| Grade | NC3030 (High-Toughness Steel CVD) |
Core Performance Benefits:
- Enhanced Structural Rigidity: The 2.5mm width handles higher lateral forces during profiling than standard 2.0mm inserts.
- Impact Resistance: The NC3030 substrate is engineered to absorb shocks, preventing brittle fractures during interrupted cuts.
- Optimized R1.25 Radius: Perfect for specialized circular grooves and fillets requiring a 2.5mm total width.
- Superior Chip Management: The -M chipbreaker effectively breaks chips in various steel types, reducing tool wear and machine downtime.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) |
|---|---|---|
| Mild Steel / Carbon Steel | 110 - 210 m/min | 0.06 - 0.15 mm/rev |
| Alloy Steel (42CrMo) | 90 - 170 m/min | 0.05 - 0.12 mm/rev |
| Forged Steel / Rough Surface | 70 - 140 m/min | 0.04 - 0.10 mm/rev |
Compatible Tool Holders:
Precision 2.5mm seat fit for standard holder systems:
- External Holders: MGEHR 1616-2.5 / 2020-2.5 / 2525-2.5
- Internal Holders: MGIVR 2016-2.5 / 2520-2.5
Machinist Tip: Why choose NC3030 over NC3020 for 2.5mm Profiling?
Selecting the right CVD grade for your MRMN250-M insert:
The "Life Insurance" Grade. Ideal for general steel turning where the cut isn't clean or the machine is older. Its toughness prevents edge failure during vibration or surface scale impact.
The Speed Specialist. Best for clean, high-speed turning in stable CNC setups. It offers higher wear resistance but lacks the shock absorption of NC3030.
Pro Advice: For MRMN250-M NC3030, the R1.25 radius provides a strong tip. If you experience built-up edge, try increasing the coolant concentration or slightly increasing the cutting speed (Vc) to take advantage of the CVD coating's thermal properties.
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.