Mitsubishi RCMX1204MO US735 Round Turning Insert | MMC Japan
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RCMX1204MO US735
Mitsubishi Materials | Heavy-Duty Stainless & Tough Alloy Specialist
The Mitsubishi RCMX1204MO US735 is a high-toughness, 12mm round turning insert designed for the most challenging stainless steel machining tasks. Featuring the legendary US735 CVD coating, this insert is built to survive interrupted cutting and unstable machining environments where standard grades fail. Its circular geometry makes it the premier choice for profiling, copy turning, and heavy-duty roughing of austenitic stainless steels and heat-resistant super alloys.
Technical Specifications
| ISO Designation | RCMX1204MO |
|---|---|
| ANSI Designation | RCMX 43 MO |
| Grade / Coating | US735 (High-TRS CVD Carbide) |
| Inscribed Circle ($IC$) | 12.0 mm (0.472") |
| Thickness ($S$) | 4.76 mm (0.187") |
US735 Grade Toughness
The US735 grade is engineered for high shock resistance. It combines a robust carbide substrate with a specialized CVD coating that prevents notch wear and thermal cracking. This makes it ideal for machining stainless steel (M-class) when facing heavy scale or inconsistent hardness, effectively absorbing the impact of interrupted cuts during roughing.
MO Chipbreaker Geometry
The MO chipbreaker is designed for medium-to-heavy applications. Its reinforced cutting edge is optimized for indexable turning, offering stability across a wide range of feed rates. The round shape provides an "infinite" number of nose radii, which lowers the cutting resistance and allows for massive surface finish improvements even at higher feed per revolution.
Recommended Cutting Parameters
Primary Material: Stainless Steel & High-Temp Alloys (M25-M40)
| Workpiece Material | Cutting Speed ($v_c$) | Feed per Rev ($f$) |
|---|---|---|
| 300 Series Stainless (304/316) | 60 - 130 m/min | 0.15 - 0.40 mm/rev |
| Duplex Stainless Steel | 40 - 80 m/min | 0.12 - 0.30 mm/rev |
| Inconel / Titanium Alloys | 25 - 55 m/min | 0.10 - 0.25 mm/rev |
SRDC / PRDCN HOLDER COMPATIBILITY
For heavy-duty profiling, mount the RCMX1204MO on Mitsubishi SRDC or PRDCN tool holders.
View Compatible Holders →Metric vs. Inch Cross-Reference
| Feature | Metric (ISO) | Inch (ANSI) |
|---|---|---|
| Insert Diameter | 12 (12.0 mm) | 4 (4/8" or 0.472") |
| Thickness | 04 (4.76 mm) | 3 (3/16" or 0.187") |
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.