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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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.