Mitsubishi SCMT09T308 US735 Carbide Insert | Genuine MMC Japan
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SCMT09T308 US735
Mitsubishi Materials | The Stainless Steel & Interrupted Cut Expert
The Mitsubishi SCMT09T308 US735 is a high-toughness indexable turning insert specifically engineered for difficult-to-cut materials. Utilizing the US735 CVD coating, this insert is the industry standard for stainless steel turning and heavy interrupted cuts. Its 0.8mm nose radius provides a robust cutting edge that resists chipping, making it the primary choice for CNC machining where stability and edge reliability are more critical than pure speed.
ISO Designation Decoded
Square 90°
7° Relief Angle
M-Class Tolerance
Countersink Hole
9.525mm Size
3.97mm Thick
0.8mm Radius
Technical Specifications
| Feature | Metric Designation | Inch (ANSI) Designation |
|---|---|---|
| Model Name | SCMT09T308 | SCMT 32.52 |
| Inscribed Circle ($IC$) | 9.525 mm | 3/8" |
| Thickness ($S$) | 3.97 mm | 5/32" |
| Nose Radius ($R_e$) | 0.8 mm | 1/32" |
US735 Grade Toughness
The US735 grade is Mitsubishi's premium solution for austenitic stainless steels and interrupted cutting. It features a specialized TiCN + Al2O3 + TiN CVD coating on a highly fracture-resistant substrate. This grade is specifically designed to prevent thermal cracking and notch wear, common issues when lathe machining stainless steel.
Versatile S-Type Geometry
As a square insert with a 7-degree positive relief angle, the SCMT shape reduces cutting resistance and power consumption. The 0.8mm radius (08) offers a heavy-duty edge that supports higher feed rates, ensuring efficient chip evacuation and preventing the dreaded "work hardening" of the stainless steel surface.
Recommended Cutting Parameters
Primary Application: Stainless Steel & Tough Alloys (M10 - M30)
| Material Group | Cutting Speed ($v_c$) | Feed Rate ($f$) | Depth of Cut ($a_p$) |
|---|---|---|---|
| Austenitic Stainless (304/316) | 80 - 180 m/min | 0.12 - 0.30 mm/rev | 0.5 - 3.0 mm |
| Duplex Stainless Steel | 60 - 120 m/min | 0.10 - 0.25 mm/rev | 0.5 - 2.5 mm |
LATHE TOOL HOLDER COMPATIBILITY
The SCMT09T3 series is designed for Mitsubishi SSDCN external holders or SSBCR/L boring bars.
View Matching 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.