Mitsubishi CNMG120412-RP MC6025 Heavy Roughing Steel Insert (10pcs)
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CNMG120412-RP MC6025
Maximum Metal Removal | MC6025 Impact Grade | RP Heavy-Feed Geometry
Engineered for Extreme Roughing Conditions
MC6025 Grade (Nano-Texture CVD): The MC6025 is Mitsubishi's benchmark grade for steel turning versatility. It utilizes a Nano-texture CVD coating that provides an incredibly tough Al2O3 layer. This prevents the cutting edge from thermal cracking during heavy roughing and offers the impact resistance necessary to survive interrupted cuts on large forged shafts or hexagonal bars.
RP Chipbreaker (Maximum Edge Support): The RP (Roughing-Positive) geometry is built for high-depth-of-cut (Ap) and high-feed (fn) scenarios. It features a significantly reinforced cutting edge land that resists the massive pressures of heavy chip loads. The "Positive" aspect of the breaker ensures that despite its strength, it still slices through the material with reduced horsepower requirements compared to traditional flat-top roughers.
1.2mm (3/64") Heavy-Duty Radius: The larger 12 radius is the secret to this insert's durability. It provides a massive heat sink at the tool tip and a much stronger corner than the 08 radius, making it nearly immune to corner chipping during heavy scale removal.
Metric vs. Imperial Comparison
| System | Model Designation | I.C. (Inscribed Circle) | Thickness | Radius (RE) |
|---|---|---|---|---|
| Metric | CNMG120412-RP | 12.7 mm | 4.76 mm | 1.20 mm |
| Imperial | CNMG433-RP | 1/2" | 3/16" | 0.0472" (3/64") |
Recommended Roughing Parameters
*The 1.2mm radius allows for higher feed rates. For best surface results, ensure the feed rate is at least 25% of the corner radius.
| Workpiece Material | Speed (Vc) | Feed (fn) | Depth (Ap) |
|---|---|---|---|
| Carbon Steel (1045/S45C) | 150 - 320 m/min | 0.30 - 0.70 mm/r | 2.00 - 6.00 mm |
| Alloy Steel (4140/SCM440) | 120 - 280 m/min | 0.25 - 0.60 mm/r | 1.50 - 5.00 mm |
Heavy-Duty Tool Holders
Avoid shim damage under high loads with DCLNR/L 12 or PCLNR/L 12 series holders:
Shop PCLNR 12 HoldersPro-Tip: When to choose the 1.2mm (12) Radius
Efficiency: Use the 1.2mm radius when you need to push feed rates above 0.45 mm/r while maintaining edge stability.
Interrupted Cuts: If you are breaking corners on an 0.8mm (08) insert while roughing, the 1.2mm radius is the immediate solution to increase process security and tool life.
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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.