Korloy MRMN250-M PC9030 2.5mm Full Radius R1.25 Stainless Steel Profiling Insert (10pcs)
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The Original Korloy MRMN250-M PC9030 is a specialized 2.5mm Full Radius (R1.25) Profiling Insert, precision-engineered as the premier choice for Stainless Steel (M) machining. Featuring the high-performance PC9030 PVD coating, this insert is optimized to handle the heat and stickiness of austenitic stainless steels. The Full Radius (Round Nose) geometry and -M (Medium) chipbreaker provide a sharp, clean cut that significantly reduces work hardening during complex 3D contouring.
The Stainless Specialist: PC9030 utilizes a nano-structured PVD coating that prevents the "welding" of chips to the insert edge. If you are machining 304 or 316 stainless and experiencing edge buildup or premature chipping, the PC9030 grade is your ultimate solution.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | MRMN250-M |
| Insert Shape | Full Radius (Round Nose) |
| Width / Radius | 2.5 mm / R1.25 |
| Grade | PC9030 (Premium Stainless Steel PVD) |
Core Performance Benefits:
- Nano-PVD Technology: Superior lubrication prevents built-up edge (BUE) in "gummy" stainless steels.
- Unique 2.5mm Size: Perfect for specific groove requirements and achieving R1.25 transitions in aerospace and medical parts.
- Sharp Edge Stability: Engineered to cut through material with minimal force, preventing tool deflection on 2.5mm narrow profiles.
- Enhanced Surface Finish: The -M chipbreaker ensures stable chip formation, leaving a high-quality finish on the workpiece radius.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) |
|---|---|---|
| Austenitic Stainless (304 / 316) | 80 - 140 m/min | 0.04 - 0.12 mm/rev |
| Martensitic Stainless (420 / 440C) | 90 - 150 m/min | 0.05 - 0.14 mm/rev |
| High-Temp Alloys (Inconel/Titanium) | 30 - 60 m/min | 0.03 - 0.08 mm/rev |
Compatible Tool Holders:
Designed for 2.5mm seat precision holder systems:
- External Holders: MGEHR 1212-2.5 / 1616-2.5 / 2020-2.5
- Internal Holders: MGIVR 2016-2.5 / 2520-2.5
Machinist Tip: Why MRMN250-M PC9030?
When machining 2.5mm wide profiles in stainless steel, heat is your enemy:
The Stainless Expert. Optimized for the 300 series. It stays sharp longer because the coating resists the chemical affinity between the insert and stainless steel chips.
The Tough Generalist. Use PC5300 only if you are dealing with heavy interrupted cuts or mixed materials (Steel/Stainless). For continuous profiling in clean stainless, PC9030 is significantly better.
Pro Advice: For MRMN250-M PC9030, always prioritize high-volume coolant. In 2.5mm grooving, chips can easily get trapped in the radius; plenty of coolant ensures the -M chipbreaker can eject them effectively.
Packaging: 10 pieces per box.
Buy Korloy MRMN250-M PC9030. 2.5mm full radius (R1.25) insert for stainless steel profiling. Premium PVD coating for anti-sticking & long tool life. Genuine at CNCHOME.
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.