Mitsubishi SPMW090304 UTI20T | Carbide Milling Insert for Steel
30-Day Free Returns
Free Worldwide Shipping
SPMW090304 UTI20T
Mitsubishi Materials | Reliable Toughness for General Machining
The Mitsubishi SPMW090304 UTI20T is a versatile indexable carbide insert designed for general-purpose milling. Utilizing the highly durable UTI20T grade, this insert excels in environments where edge toughness is paramount. It is the perfect long-tail solution for stainless steel, alloy steel, and cast iron, providing stable performance in both manual machines and CNC centers.
ISO Code Breakdown
Square
11° Relief
M-Class Tol.
Fixing Hole
9.525mm Size
3.18mm Thick
0.4mm Rad.
Dimensional Comparison
| Parameter | Metric (ISO) | Inch (ANSI) Equivalent |
|---|---|---|
| Model Number | SPMW090304 | SPMW 32.51 |
| Inscribed Circle ($IC$) | 9.525 mm | 0.375" |
| Thickness ($S$) | 3.18 mm | 0.125" |
| Nose Radius ($RE$) | 0.4 mm | 0.016" |
Grade: UTI20T Uncoated Carbide
UTI20T is a high-toughness, PVD uncoated carbide grade. It is specifically formulated to withstand high mechanical shocks and vibrations, making it far more reliable than cermet or brittle carbides in interrupted cutting. It provides exceptional edge stability when machining stainless steels (300/400 series) and gray cast iron.
Geometry: W-Type General Purpose
The W-Type geometry refers to the countersunk mounting hole. This insert features a sharp cutting edge without a heavy molded chipbreaker, allowing for clean shearing and lower cutting forces. It is the preferred choice for manual milling machines and medium-speed CNC finishing.
Cutting Parameter Recommendations
| Workpiece Material | Speed ($v_c$) | Feed per Tooth ($f_z$) |
|---|---|---|
| Carbon Steel / Alloy Steel | 100 - 180 m/min | 0.10 - 0.25 mm/t |
| Stainless Steel | 60 - 130 m/min | 0.08 - 0.20 mm/t |
| Cast Iron | 80 - 150 m/min | 0.15 - 0.35 mm/t |