Mitsubishi SCMT120408 US735 Carbide Insert | Genuine MMC Japan
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SCMT120408 US735
Mitsubishi Materials | The Toughened Stainless Steel Specialist
The Mitsubishi SCMT120408 US735 is a high-performance indexable turning insert specifically engineered for difficult-to-cut materials. Utilizing the legendary US735 CVD coating, this insert is the industry's "problem solver" for stainless steel turning and heavy interrupted cuts. Its 0.8mm nose radius provides a reinforced cutting edge that excels in high-feed machining, ensuring maximum reliability where standard inserts fail due to thermal shock or mechanical impact.
ISO Designation Decoded
Square 90°
7° Relief Angle
M-Class Tolerance
Countersink Hole
12.7mm Size
4.76mm Thick
0.8mm Radius
Technical Specifications
| Feature | Metric Designation | Inch (ANSI) Designation |
|---|---|---|
| Model Name | SCMT120408 | SCMT 432 |
| Inscribed Circle ($IC$) | 12.7 mm | 1/2" |
| Thickness ($S$) | 4.76 mm | 3/16" |
| Nose Radius ($R_e$) | 0.8 mm | 1/32" |
US735 Grade Superiority
The US735 grade is Mitsubishi's specialized CVD (Chemical Vapor Deposition) coating optimized for austenitic stainless steel. It features a high-toughness substrate that provides extreme resistance to thermal cracking and boundary damage. This makes it indispensable for precision machining in 304/316 stainless and nickel-based superalloys where heat generation is high.
0.8mm Nose Radius (08)
The 0.8mm radius (08) offers significantly higher edge strength compared to 0.4mm versions. It allows for increased feed rates and handles deeper depths of cut without chipping. This geometry is perfect for medium-to-rough lathe turning, where productivity and tool life are prioritized over extremely fine surface finishing.
Recommended Cutting Parameters
Optimized for Stainless Steel (ISO M10 - M30)
| Workpiece Material | Cutting Speed ($v_c$) | Feed Rate ($f$) | Depth of Cut ($a_p$) |
|---|---|---|---|
| Austenitic Stainless (304, 316) | 80 - 160 m/min | 0.12 - 0.35 mm/rev | 1.0 - 4.5 mm |
| Duplex / Super Alloys | 40 - 90 m/min | 0.10 - 0.25 mm/rev | 0.8 - 3.5 mm |
LATHE TOOL HOLDER COMPATIBILITY
The SCMT1204 series is designed for Mitsubishi SSDCN external holders or SSBCR/L heavy-duty boring bars.
Shop Compatible Tool Holders →
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.