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") |
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This Mitsubishi insert is in stock. 24-hour quote response. ISO 9001 certified. Ships from Hangzhou in 3–7 days.
Technical FAQ & Buying Guide
When choosing CNC cutting tools, check the full model code, dimensions, grade and selected variant before ordering. Do not rely on the product image alone.
For carbide inserts, tool holders, drills and end mills, compare the mounting dimensions, connection type and manufacturer's specifications with your holder or machine. If you are unsure, share your existing part number and machining application with us before ordering.
Check the product listing for the selling unit, pack quantity and included components. If it is unclear whether the price is per piece or per pack, or whether a tool body and inserts are sold separately, contact us before purchasing.
Select cutting speed, feed rate and depth of cut using the relevant manufacturer's recommendations for your tool model, workpiece material, machine conditions and coolant method. The same settings are not suitable for every product or application.
Our automatic quantity discount is 6% off for 2–9 items and 12% off for 10 or more items, based on the total product quantity in the cart. Other offers may not combine with this discount; check the applicable offer conditions.
According to our shipping policy, orders are typically processed and shipped within 1–3 business days after confirmation. Delivery generally takes 5–20 business days, depending on your destination and shipping method. Customs clearance or unforeseen delays may affect delivery times. A tracking number is sent by email after shipment.