Mitsubishi MMT16IR125ISO-S VP15TF Threading Insert | MMC Japan
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MMT16IR125ISO-S VP15TF
Mitsubishi Materials | Internal ISO Metric Threading | 1.25mm Pitch
The Mitsubishi MMT16IR125ISO-S VP15TF is a precision-engineered internal threading insert designed for high-accuracy 1.25mm pitch ISO metric threads. Part of the world-renowned MMT series, this insert is the go-to solution for internal CNC threading where chip evacuation and edge toughness are critical. Featuring the advanced -S type 3D chipbreaker and the legendary VP15TF Miracle PVD coating, this insert excels in threading stainless steel, alloy steels, and general carbon steels, providing a superior surface finish and extended tool life.
Technical Specifications
| ISO Designation | MMT16IR125ISO-S |
|---|---|
| Thread Profile / Angle | ISO Metric 60° (Full Form) |
| Thread Pitch | 1.25 mm |
| Insert Size (IC) | 9.525 mm (3/8") |
| Grade / Coating | VP15TF (Miracle Al-Ti-N PVD) |
VP15TF Miracle Grade
The VP15TF grade is Mitsubishi's premier universal PVD grade. By pairing a micro-grain carbide substrate with the Miracle (Al-Ti-N) coating, it provides an optimal balance of wear resistance and toughness. This is the top choice for indexable threading in medium-to-low speed ranges, especially where adhesion resistance is needed to prevent built-up edge (BUE) in stainless steel.
-S Type 3D Chipbreaker
The -S molded chipbreaker is specifically designed for internal threading. Because chips can become trapped inside the bore, the 3D geometry forces the chip to curl tightly and break early. This ensures chips are easily flushed out by the boring bar's coolant, preventing the surface damage and catastrophic tool failure caused by chip "nesting."
Recommended Cutting Parameters
| Workpiece Material | Cutting Speed ($v_c$) | Total No. of Passes |
|---|---|---|
| Carbon Steels (P10-P30) | 100 - 180 m/min | 7 - 12 |
| Stainless Steels (M10-M30) | 80 - 140 m/min | 9 - 14 |
| Alloy Steels (H-Steels) | 80 - 150 m/min | 8 - 13 |
MMTIR INTERNAL TOOLING SYSTEM
This 16IR insert is designed for Mitsubishi MMTIR internal boring bars and standard 16mm internal threading holders.
Shop MMTIR Internal Bars →Metric vs. Inch Cross-Reference
| Feature | Metric (ISO Model) | Inch Equivalent (ANSI) |
|---|---|---|
| Insert Size | 16 IR | 3 IR (3/8" Inscribed Circle) |
| Thread Pitch | 1.25 mm | ~20.3 TPI (Threads Per Inch) |