Mitsubishi SOMT12T308PEER-JH MC5020 | Heavy-Duty Cast Iron Milling
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SOMT12T308PEER-JH MC5020
Mitsubishi Materials | Heavy-Duty Cast Iron Milling Specialist
The Mitsubishi SOMT12T308PEER-JH MC5020 is a specialized indexable milling insert designed for high-load applications in cast iron (ISO K). Featuring the robust JH (Heavy Duty) chipbreaker and the premium MC5020 CVD coating, this insert excels in environments where impact resistance and abrasive wear protection are critical. It is the premier choice for heavy roughing and interrupted cuts in Gray Iron (GG) and Ductile Iron (GGG).
100% Original Mitsubishi Materials | Pack of 10 Inserts
ISO Designation Decoded
Square Shape
Relief Angle
M-Class Precision
Hole/Chipbreaker
Size 12mm
3.97mm Thick
0.8mm Radius
Heavy Duty
Specification Comparison
| Dimension | Metric (ISO) | Inch (ANSI) Equivalent |
|---|---|---|
| Model Name | SOMT12T308PEER-JH | SOMT 432 PEER-JH |
| Size ($IC$) | 12.7 mm | 0.500" |
| Thickness ($S$) | 3.97 mm | 0.156" |
| Corner Radius ($RE$) | 0.8 mm | 0.031" |
MC5020: The Cast Iron Authority
The MC5020 grade is Mitsubishi's premium CVD coated carbide specifically for cast iron milling. Engineered with a nano-texture high wear-resistance Al2O3 layer and a fibrous TiCN layer, it provides industry-leading oxidation resistance and prevents chipping. It allows for high-speed machining without sacrificing tool life, even in abrasive ductile iron.
JH (Heavy Roughing) Geometry
The JH chipbreaker features a reinforced cutting edge designed for heavy roughing and unstable conditions. By providing extra land and edge strength, the JH breaker effectively prevents fracturing during interrupted cuts or when milling workpieces with heavy cast skin. It is the definitive choice for maximizing metal removal rates (MRR).
Recommended Milling Parameters
| Workpiece Material | Cutting Speed ($v_c$) | Feed per Tooth ($f_z$) | Depth of Cut ($a_p$) |
|---|---|---|---|
| Gray Cast Iron (GG25) | 150 - 300 m/min | 0.15 - 0.40 mm/t | Up to 5.0 mm |
| Ductile Cast Iron (GGG) | 120 - 250 m/min | 0.12 - 0.35 mm/t | Up to 4.0 mm |
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.