Mitsubishi SPMW090308 NX2525 | Mirror Finish Cermet Insert
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SPMW090308 NX2525
Mitsubishi Materials | High-Speed Mirror Finishing Specialist
The Mitsubishi SPMW090308 NX2525 is an industry-leading cermet milling insert designed for precision finishing. By utilizing the NX2525 uncoated cermet grade, this insert provides a chemical stability that traditional tungsten carbide cannot match. It is engineered to produce a high-gloss surface finish on carbon and alloy steels, effectively eliminating built-up edge (BUE) during high-speed dry milling finishing operations.
Designation Decoding
Square
11° Relief
M-Class Tol.
Countersink
9.525mm Size
3.18mm Thick
0.8mm Rad.
Technical Specifications
| Parameter | ISO (Metric) | ANSI (Inch) Equivalent |
|---|---|---|
| Model Number | SPMW090308 | SPMW 32.52 |
| Inscribed Circle ($IC$) | 9.525 mm | 0.375" |
| Thickness ($S$) | 3.18 mm | 0.125" |
| Nose Radius ($RE$) | 0.8 mm | 0.031" |
Material: NX2525 Cermet Grade
The NX2525 grade is a premium micro-grain uncoated cermet (Ceramic + Metal). Cermets are chemically inert, meaning they do not react with steel at high temperatures. This prevents crater wear and adhesion, allowing the SPMW090308 to maintain a sharp edge much longer than coated carbide during high-speed steel milling.
Geometry: Flat-Top Finishing (W-Style)
The W-Type geometry refers to the countersunk hole for screw-on clamping. This insert features a sharp edge finishing geometry without a molded chipbreaker, providing a low-resistance shearing action. The 0.8mm radius ($RE$) is optimized for balancing edge strength with a high-quality surface profile ($Ra$).
Recommended Cutting Parameters
| Material Category | Cutting Speed ($v_c$) | Feed per Tooth ($f_z$) |
|---|---|---|
| Carbon Steel / Alloy Steel | 180 - 350 m/min | 0.08 - 0.18 mm/t |
| Gray Cast Iron | 150 - 280 m/min | 0.10 - 0.25 mm/t |