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.
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