Mitsubishi CNMG120412-MS US735 Roughing Insert for Stainless Steel (10pcs)
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CNMG120412-MS US735
Heavy Roughing Specialist | US735 Tough PVD | MS Chip Control Geometry
Engineered for Maximum Reliability in Tough Alloys
US735 Grade (The Impact King): The US735 is a specialized PVD-coated grade designed specifically for M-Class (Stainless Steel). It is Mitsubishi's most resilient grade against thermal cracking and mechanical shock. This makes it the go-to choice for interrupted cuts, machining through weld seams, or working with unstable setups where "stringy" materials tend to cause edge failure.
MS Chipbreaker (Stainless Precision): The MS geometry is a high-sharpness chipbreaker tailored for the unique properties of stainless steel. It prevents work hardening by shearing the material cleanly rather than "plowing" it. Despite being a finishing-oriented geometry, in the 1.2mm radius format, it provides elite chip control during heavy-duty removal.
1.2mm (3/64") Reinforced Radius: The large corner radius is built for strength and high feed rates. It dissipates heat across a larger edge area, preventing the plastic deformation common in 316 and Duplex stainless steel. It also allows for much more aggressive feed rates ($f_n$) compared to 0.4 or 0.8mm versions.
Metric vs. Imperial Comparison
| System | Model Designation | I.C. (Inscribed Circle) | Thickness | Radius (RE) |
|---|---|---|---|---|
| Metric | CNMG120412-MS | 12.7 mm | 4.76 mm | 1.20 mm |
| Imperial | CNMG433-MS | 1/2" | 3/16" | 0.0472" (3/64") |
Heavy Roughing Cutting Parameters
*The US735 grade prioritizes toughness over speed. Use flood coolant for best results in stainless steel roughing.
| Workpiece Material | Speed (Vc) | Feed (fn) | Depth (Ap) |
|---|---|---|---|
| Stainless Steel (304 / 316) | 70 - 150 m/min | 0.25 - 0.55 mm/r | 1.20 - 4.50 mm |
| Inconel / Titanium Alloys | 30 - 60 m/min | 0.20 - 0.40 mm/r | 1.00 - 3.00 mm |
Recommended Tool Holders
Maximum clamping rigidity is essential for heavy roughing. Fits DCLNR/L 12 series holders:
Shop DCLNR 12 HoldersPro-Tip: When to choose US735?
US735 (The Tough Specialist): This is your insurance policy for stainless steel. If your insert is chipping during interrupted cuts or because the machine isn't rigid enough, US735 is the answer.
VP15TF vs. US735: Use VP15TF for high-speed continuous turning to maximize tool life. Switch to US735 for roughing, heavy scale, and interrupted passes.
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