Mitsubishi CNMG120408-MA US735 Stainless Steel Turning Insert (10pcs)
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CNMG120408-MA US735
The Stainless Steel Specialist | US735 PVD Toughness | MA Medium Geometry
Superior Resistance to Work-Hardening
US735 Grade (Extreme PVD Toughness): The US735 is Mitsubishi’s premier PVD-coated grade specifically developed for Stainless Steel (M-Class) and Heat Resistant Super Alloys (S-Class). Unlike CVD coatings that can delaminate under high pressure, the US735 coating adheres aggressively to the substrate, providing exceptional resistance to thermal cracking and notch wear during interrupted cuts.
MA Chipbreaker (Universal Medium Cut): The MA geometry is engineered for a wide range of medium-duty applications. It features a specialized land design that balances low cutting force with edge stability, ensuring that chips are broken effectively even in gummy materials like 300-series stainless steel.
0.8mm (1/32") Balanced Radius: This industry-standard radius provides the highest versatility. It is robust enough to handle semi-roughing while achieving excellent surface finishes (Ra) during finishing passes, making it the one-size-fits-all solution for stainless steel production.
Metric vs. Imperial Comparison
| System | Model Designation | I.C. (Inscribed Circle) | Thickness | Radius (RE) |
|---|---|---|---|---|
| Metric | CNMG120408-MA | 12.7 mm | 4.76 mm | 0.80 mm |
| Imperial | CNMG432-MA | 1/2" | 3/16" | 0.0315" (1/32") |
Recommended Cutting Parameters
*Stainless steel machining requires steady feed rates to stay below the work-hardened layer. Use flood coolant.
| Material Group | Speed (Vc) | Feed (fn) | Depth (Ap) |
|---|---|---|---|
| Stainless Steel (304/316) | 70 - 160 m/min | 0.12 - 0.35 mm/r | 0.50 - 3.50 mm |
| High-Temp Alloys (Inconel/Titanium) | 25 - 55 m/min | 0.10 - 0.25 mm/r | 0.50 - 2.00 mm |
Compatible Tool Holders
Maximum performance for DCLNR/L 12 and MCLNR/L 12 series holders:
Shop DCLNR 12 HoldersPro-Tip: US735 vs. US7020
US735 (High-Impact Toughness): The definitive choice for interrupted cuts or low-rigidity setups where chipping is the primary failure mode.
US7020: Choose this grade for high-speed, continuous turning of stainless steel where you need higher wear resistance and can maintain a stable temperature at the cutting edge.
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