Mitsubishi SPMN120308 UTI20T | General Purpose Carbide Insert
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SPMN120308 UTI20T
Mitsubishi Materials | The Workhorse of Conventional Machining
The Mitsubishi SPMN120308 UTI20T is a time-tested, general-purpose carbide insert renowned for its reliability in milling and turning operations. Utilizing the high-toughness UTI20T grade (PVD uncoated), this insert is specifically engineered to handle the demands of stainless steel, alloy steel, and cast iron. With its flat-top design and sharp cutting edge, it provides excellent stability in manual and CNC setups.
Genuine Mitsubishi Carbide | Box of 10 Inserts
Code Specification Decoded
Square Shape
11° Relief Angle
M-Class Tolerance
No Chipbreaker
12.7mm IC
3.18mm Thick
0.8mm Radius
Unit Comparison Table
| Dimension | Metric (ISO) | Inch (ANSI) Equivalent |
|---|---|---|
| Model Name | SPMN120308 | SPMN 422 |
| Width (IC) | 12.7 mm | 0.500" |
| Thickness (S) | 3.18 mm | 0.125" |
| Radius (RE) | 0.8 mm | 0.031" |
UTI20T: The Tough Grade
The UTI20T grade is a non-coated carbide alloy that offers a perfect balance of wear resistance and fracture toughness. It is the go-to grade for general milling where vibration or intermittent cutting may occur. This grade excels in stainless steel machining and produces stable results in Cast Iron (ISO K) and carbon steels.
Flat-Top (No Chipbreaker)
As an "N" type insert, the SPMN has no molded chipbreaker on the top face. This provides a high-strength cutting edge designed for light-to-medium loads. It is ideal for conventional face milling where the chip formation is naturally controlled by the tool's approach angle, or for use in legacy tool holders with mechanical chip deflectors.
Milling & Turning Parameters
| Workpiece Material | Cutting Speed ($v_c$) | Feed Rate ($f$) | Depth of Cut ($a_p$) |
|---|---|---|---|
| Stainless Steel (304/316) | 80 - 150 m/min | 0.1 - 0.3 mm/rev | 0.5 - 3.5 mm |
| Gray Cast Iron | 100 - 180 m/min | 0.15 - 0.4 mm/rev | 1.0 - 4.0 mm |
COMPATIBLE TOOLING
Compatible with standard SPM 422 tool holders and conventional face mills.
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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.