Korloy MRMN400-M PC9030 4mm Full Radius R2.0 Stainless Steel Insert (10pcs)
Price shown is a starting point. Contact us for a precise quote based on your requirements.
The Original Korloy MRMN400-M PC9030 is a high-performance 4.0mm Full Radius (R2.0) Profiling Insert, widely recognized as the industry leader for Stainless Steel (M) turning. Equipped with the premium PC9030 PVD nano-coating, this insert is specifically engineered to combat the high cutting temperatures and adhesion issues typical of austenitic stainless steels. The Full Radius (Round Nose) geometry, paired with the -M (Medium) chipbreaker, ensures clean shearing and excellent chip control for large R2.0 fillets and circular grooves.
Designed for Stainless Excellence: PC9030 features an ultra-smooth PVD layer that provides superior lubrication. This prevents the "built-up edge" (BUE) where stainless steel material welds to the tip, ensuring that your 4.0mm profiles maintain perfect dimensional accuracy and a mirror finish.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | MRMN400-M |
| Insert Shape | Full Radius (Round Nose) |
| Width / Radius | 4.0 mm / R2.0 |
| Grade | PC9030 (Premium Stainless PVD) |
Core Performance Benefits:
- Anti-Adhesion Coating: Specialized PVD formula resists chemical bonding with stainless steel, extending tool life by up to 50%.
- R2.0 Full Radius Rigidity: The 4mm width provides the structural strength needed for heavy profiling in tough alloys without tool chatter.
- High Heat Resistance: Maintains edge sharpness even during long-cycle machining of low-thermal-conductivity materials.
- Optimized -M Chipbreaker: Efficiently breaks "stringy" stainless chips even at medium feed rates, protecting the workpiece surface.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) |
|---|---|---|
| 304 / 316 Stainless Steel | 80 - 140 m/min | 0.08 - 0.18 mm/rev |
| 400 Series Stainless | 90 - 150 m/min | 0.10 - 0.20 mm/rev |
| Duplex / Super Alloys | 40 - 80 m/min | 0.05 - 0.12 mm/rev |
Compatible Tool Holders:
Precision 4.0mm seat fit for heavy-duty profiling systems:
- External Holders: MGEHR 2525-4 / 3232-4
- Internal Holders: MGIVR 3125-4 / 4032-4
Machinist Tip: Why PC9030 for 4.0mm Profiling?
At 4.0mm width, the increased contact area between the insert and stainless steel generates significant friction heat:
The Precision Specialist. Its nano-PVD coating is thin but incredibly dense. This allows the edge to remain sharper for longer, which is vital for stainless steel to prevent work hardening of the radius.
The Tough Alternative. Use PC5300 only if your 4.0mm cut is heavily interrupted (e.g., crossing a hole) or if you are machining high-strength forged stainless. PC9030 is superior for all stable profiling.
Pro Advice: For MRMN400-M PC9030, ensure your coolant volume is high. Stainless steel chips are excellent at retaining heat; if they aren't flushed away immediately, they can recut and damage the R2.0 radius finish.
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.