Mitsubishi CNMG120412-GH US735 Roughing Insert for Stainless Steel (10pcs)
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CNMG120412-GH US735
Stainless Heavy Rougher | US735 Toughness | 1.2mm Reinforced Edge
The Ultimate Solution for Interrupted Stainless Steel Cuts
US735 Grade (Impact Resilience): The US735 is a specialized CVD-coated grade designed specifically for M-Class (Stainless Steel) applications. Unlike PVD grades which prioritize sharpness, US735 utilizes a high-toughness substrate that resists thermal cracking and mechanical chipping. It is the "safety first" grade for machining through scale, welds, or heavy interruptions where other inserts shatter.
GH Chipbreaker (Structural Power): The GH geometry is Mitsubishi's most robust roughing profile. It features a wide, negative land (T-land) that reinforces the cutting edge. This design prevents the "notching" wear commonly seen when roughing stainless steel and allows for massive chip loads without compromising the tool's structural integrity.
1.2mm (3/64") Corner Radius: The 1.2mm radius offers superior heat dissipation compared to smaller radii. It allows for significantly higher feed rates and provides a much stronger tip for plowing through the work-hardened skin of austenitic stainless steel.
Metric vs. Imperial Comparison
| System | Model Designation | I.C. (Inscribed Circle) | Thickness | Radius (RE) |
|---|---|---|---|---|
| Metric | CNMG120412-GH | 12.7 mm | 4.76 mm | 1.20 mm |
| Imperial | CNMG433-GH | 1/2" | 3/16" | 0.0472" (3/64") |
Heavy Roughing Cutting Parameters
*The 1.2mm radius is built for heavy feeds. Always use high-volume coolant to prevent heat buildup on the cutting edge.
| Workpiece Material | Speed (Vc) | Feed (fn) | Depth (Ap) |
|---|---|---|---|
| Stainless Steel (304/316) | 60 - 150 m/min | 0.25 - 0.50 mm/r | 1.50 - 5.50 mm |
| Duplex Stainless / Alloys | 40 - 100 m/min | 0.20 - 0.40 mm/r | 1.00 - 4.50 mm |
Compatible Tool Holders
Maximum rigidity is mandatory for heavy 1.2mm radius roughing. Fits DCLNR/L 12 series holders:
Shop DCLNR 12 HoldersPro-Tip: US735 vs. VP15TF
US735 (The Heavy-Duty Guardian): Use this when your primary failure is edge breakage. It is far tougher than VP15TF but operates at slightly lower speeds. Perfect for rough castings.
VP15TF (The Precision Runner): Choose VP15TF for continuous turning at higher speeds to achieve better surface finish and tool life in stable environments.
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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.