Mitsubishi SNMG120412-MA US735 Turning Insert | Stainless Steel Roughing
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SNMG120412-MA US735
Mitsubishi Materials | Heavy-Duty Strength for Stainless Steel & Interrupted Cuts
The Mitsubishi SNMG120412-MA US735 is a heavy-duty indexable carbide insert engineered for the most demanding stainless steel turning applications. Featuring a reinforced 1.2mm corner radius and the high-toughness US735 CVD coating, this insert is the industry's answer to interrupted cutting and roughing of difficult-to-machine alloys. It is specifically optimized for ISO M-class materials where edge security and thermal shock resistance are paramount.
Condition: 100% Original Mitsubishi | Box of 10 Inserts
ISO Designation Decoded
Square 90°
0° Relief
M-Class Tol.
Double Sided
12.7mm Size
4.76mm Thick
1.2mm Radius
Medium-Rough
Technical Specifications
| Dimension | Metric (ISO) | Inch (ANSI) Equivalent |
|---|---|---|
| Model Name | SNMG120412-MA | SNMG 433-MA |
| Inscribed Circle ($IC$) | 12.7 mm | 0.500" (1/2") |
| Thickness ($S$) | 4.76 mm | 0.187" (3/16") |
| Corner Radius ($RE$) | 1.2 mm | 0.047" (3/64") |
US735 Toughness Optimized Grade
The US735 grade is Mitsubishi's benchmark for machining stainless steel under heavy load. This CVD coated carbide substrate is specially formulated to resist thermal cracking and plastic deformation. Its superior coating lubricity prevents "sticky" chip adhesion, a common cause of edge chipping in austenitic stainless steels like 304 and 316.
MA Medium-Rough Chipbreaker
The MA chipbreaker is designed for medium-roughing applications. With its larger 1.2mm radius, this geometry supports high feed rates and significant depth of cut ($a_p$). It provides exceptional chip control by breaking tough, stringy stainless chips quickly, reducing heat buildup and ensuring stable CNC lathe operation.
Recommended Cutting Parameters
Optimized for Heavy Stainless Machining (US735)
| Material Group | Cutting Speed ($v_c$) | Feed Rate ($f$) | Depth of Cut ($a_p$) |
|---|---|---|---|
| 304/316 Stainless Steel | 80 - 180 m/min | 0.20 - 0.50 mm/rev | 1.5 - 4.5 mm |
| Duplex Stainless Steel | 60 - 130 m/min | 0.18 - 0.45 mm/rev | 1.5 - 4.0 mm |
HOLDER COMPATIBILITY
Matches with heavy-duty PSSNR/L, DSBNR/L, or MSKNR/L turning tool holders.
Shop Turning Holders →
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.