Mitsubishi SCMT120404 US735 Carbide Insert | MMC Japan Genuine
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SCMT120404 US735
Mitsubishi Materials | The Stainless Steel & Interrupted Cut Specialist
The Mitsubishi SCMT120404 US735 is a high-toughness indexable turning insert specifically designed for the most demanding stainless steel turning environments. Utilizing the specialized US735 CVD coating, this insert excels in heavy interrupted cuts and unstable machining conditions where other grades chip. With a 0.4mm nose radius, it is the ideal choice for precision machining and achieving a superior surface finish on difficult-to-cut alloys.
ISO Designation Decoded
Square 90°
7° Relief Angle
M-Class Tolerance
With Hole
12.7mm Size
4.76mm Thick
0.4mm Radius
Technical Specifications
| Feature | Metric Designation | Inch (ANSI) Designation |
|---|---|---|
| Model Name | SCMT120404 | SCMT 431 |
| Inscribed Circle ($IC$) | 12.7 mm | 1/2" |
| Thickness ($S$) | 4.76 mm | 3/16" |
| Corner Radius ($R_e$) | 0.4 mm | 1/64" |
US735 Grade Performance
The US735 grade is Mitsubishi's premier CVD coated carbide for ISO-M (Stainless Steel) applications. It is engineered with a high-toughness substrate that effectively prevents thermal cracking and notch wear. This makes it a "problem solver" grade for CNC machining of austenitic stainless steels (304, 316) and duplex steels where tool reliability is the top priority.
Precision S-Type Geometry
As an S-Type (Square) insert with a 7° positive relief, this geometry reduces cutting resistance and heat generation. The 04 (0.4mm) radius is optimized for finishing and semi-finishing operations, ensuring high dimensional accuracy and reducing the risk of vibration on small-diameter lathe turning tasks.
Recommended Cutting Parameters
Optimized for Stainless Steel (ISO M10 - M30)
| Material | Cutting Speed ($v_c$) | Feed Rate ($f$) | Depth of Cut ($a_p$) |
|---|---|---|---|
| Austenitic (304, 316) | 100 - 180 m/min | 0.10 - 0.25 mm/rev | 0.5 - 2.5 mm |
| Ferritic/Martensitic | 120 - 220 m/min | 0.08 - 0.20 mm/rev | 0.3 - 2.0 mm |
COMPATIBLE LATHE TOOL HOLDERS
The SCMT1204 series is designed for Mitsubishi SSDCN or SSBCR/L external turning holders and heavy-duty boring bars.
View S-Type 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.