Mitsubishi TPGH080204L-FS AP25N | Left-Hand Cermet Turning Insert
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TPGH080204L-FS AP25N
Mitsubishi Materials | High-Speed Steel Finishing Cermet (Left-Hand)
Mirror-Finish Steel Machining
The Mitsubishi TPGH080204L-FS AP25N is a Left-Hand (L) high-precision Cermet insert designed for super-finishing steel. The AP25N grade combines the toughness of carbide with the heat resistance of ceramic, allowing for higher cutting speeds and a glossy surface finish. Paired with the FS chipbreaker, it is the ultimate choice for CNC boring and finishing where dimensional accuracy and aesthetic quality are paramount.
Advanced Cermet AP25N | 11° Positive Relief | FS Precision Breaker
Technical Code Identification
Triangular Shape
11° Positive Relief
G-Class Tolerance
Cylindrical Hole
8mm Edge Length
2.38mm Thick
0.4mm Radius
Left-Hand
Finish Breaker
ISO (Metric) vs ANSI (Inch) Comparison
| Technical Spec | ISO Model (Metric) | ANSI Model (Inch) |
|---|---|---|
| Part Number | TPGH080204L-FS | TPGH 1.51.51L FS |
| Inscribed Circle | 4.76 mm | 0.187" (3/16") |
| Corner Radius | 0.4 mm | 0.016" (1/64") |
AP25N Cermet Grade
AP25N is an advanced TiCN-based Cermet. Because Cermet has a low affinity for steel, it resists built-up edge and oxidation at high temperatures. This long-tail precision insert is ideal for maintaining tight tolerances and achieving mirror finishes in carbon and alloy steel finishing.
FS "Super-Finish" Breaker
The FS chipbreaker is designed for ultra-fine finishing. It curtails long chips at very low depths of cut and feed rates, ensuring chips do not scratch the workpiece—a critical factor in high-quality CNC boring applications.
Recommended Cutting Parameters
| Workpiece Material | Speed ($v_c$) | Feed ($f$) | DOC ($a_p$) |
|---|---|---|---|
| Carbon Steel / Alloy Steel | 150 - 300 m/min | 0.05 - 0.15 mm/rev | 0.1 - 1.0 mm |
| Soft Steels / Mild Steel | 180 - 350 m/min | 0.05 - 0.12 mm/rev | 0.1 - 0.8 mm |
REQUIRED LEFT-HAND HOLDERS
Designed for Left-Hand (L) tool paths. Optimized for use with standard STFPL or STGPL boring bars.
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