Korloy MGMN400-M PC9030 4mm Double-Ended Stainless Steel Grooving Insert (10pcs)
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The Original Korloy MGMN400-M PC9030 is a heavy-duty 4.0mm Double-Ended Grooving Insert specifically engineered for Stainless Steel and High-Temperature Alloys. Featuring the industry-standard PC9030 PVD grade, this insert is the professional solution for managing the high cutting forces and heat generated when machining materials like 304, 316, and Duplex stainless steel. The 4.0mm width ensures maximum tool rigidity during deep radial plunging and aggressive parting-off operations.
Stability for Tough Alloys: MGMN400-M is designed for larger workpieces where a 2mm or 3mm insert might lack sufficient strength. The PC9030 coating provides a thermal shield that maintains edge sharpness even in high-torque stainless steel applications.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | MGMN400-M |
| Insert Width (w) | 4.0 mm (+/- 0.03) |
| Grade | PC9030 (Premium Stainless Steel Specialist) |
| Ideal For | Stainless Steel (M), Titanium (S), Alloy Steel (P) |
Core Performance Benefits:
- Edge-Chipping Resistance: Specialized PVD coating prevents micro-cracking and chipping in interrupted cuts.
- 4.0mm High Stability: Robust body allows for deeper grooves without the risk of tool deflection or vibration.
- Advanced Heat Management: PC9030 grade resists thermal shock, a common cause of failure in stainless steel machining.
- Exceptional Chip Control: The -M chipbreaker geometry forces tough stainless chips to curl and break for easy evacuation.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) |
|---|---|---|
| Stainless Steel (304 / 316) | 80 - 140 m/min | 0.10 - 0.22 mm/rev |
| Duplex Stainless Steel | 50 - 90 m/min | 0.08 - 0.18 mm/rev |
| Titanium Alloys / Inconel | 30 - 60 m/min | 0.07 - 0.15 mm/rev |
Compatible Tool Holders:
For the best performance in 4.0mm heavy-duty grooving, pair with these holders:
- External Holders: MGEHR 2020-4 / 2525-4 / 3232-4
Stainless Steel Expert Insight: PC9030 vs. PC5300
When machining 4.0mm grooves in tough alloys, selecting the right grade is critical:
The Stainless Specialist. Optimized for chemical stability in sticky materials. It prevents material from "welding" to the insert, which is the primary cause of failure in 300-series stainless steel.
The Tough Multi-Tool. Exceptional for interrupted cuts and carbon steel. While it can cut stainless, PC9030 will significantly outperform it in high-temperature or continuous stainless steel cycles.
Machinist's Pro Tip: For MGMN400-M PC9030, if you notice the workpiece turning blue or smoke from the chip, increase the coolant flow directly to the 4.0mm tip. Stainless steel has poor thermal conductivity; the PC9030 grade needs that cooling to manage the heat concentration at the edge.
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.