Mitsubishi MMT11IR125ISO-S VP15TF Threading Insert | MMC Japan
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MMT11IR125ISO-S VP15TF
Mitsubishi Materials | MMT Series Internal ISO Metric Threading
The Mitsubishi MMT11IR125ISO-S VP15TF is a precision internal threading insert engineered for 1.25mm pitch ISO metric threads. Designed for the MMTIR boring bar series, this insert features the advanced -S type 3D chipbreaker, which is essential for managing chip evacuation in restricted internal bores. Coated with the high-performance VP15TF Miracle PVD coating, it provides an exceptional balance of toughness and wear resistance, making it the preferred choice for threading steel, stainless steel, and heat-resistant alloys.
Technical Specifications
| ISO/Metric Designation | MMT11IR125ISO-S |
|---|---|
| Thread Standard / Angle | ISO Metric 60° (Full Form) |
| Thread Pitch | 1.25 mm |
| Insert Size (IC) | 6.35 mm (1/4") |
| Grade / Coating | VP15TF (Miracle PVD Coated) |
VP15TF "Miracle" Grade
The VP15TF grade is Mitsubishi’s premier universal PVD grade. It combines a tough micro-grain carbide substrate with the Miracle Al-Ti-N coating. This grade excels in indexable threading applications by resisting thermal shock and providing superior chipping resistance on the cutting edge, even during interrupted cuts.
-S Type 3D Chipbreaker
The -S type chipbreaker is specifically designed for internal threading where chip clogging is a risk. Its 3D molded geometry forces the chip to curl and break into short, manageable segments. This prevents the "bird-nesting" of chips around the tool or the threading bar, significantly improving surface finish and safety.
Recommended Cutting Parameters
| Workpiece Material | Cutting Speed ($v_c$) | No. of Passes (P=1.25) |
|---|---|---|
| Carbon Steel (S45C) | 80 - 160 m/min | 7 - 11 |
| Alloy Steel (SCM440) | 70 - 140 m/min | 8 - 12 |
| Stainless Steel (304/316) | 60 - 120 m/min | 9 - 14 |
MMTIR INTERNAL HOLDER SYSTEM
This 11IR insert is compatible with Mitsubishi MMTIR holders and standard threading boring bars with a 1/4" pocket.
Shop MMTIR Boring Bars →Metric vs. Inch Cross-Reference
| Feature | Metric: MMT11IR125ISO | ANSI: 11IR 1.25 ISO |
|---|---|---|
| Insert Length | 11 mm | 1/4" IC (Inscribed Circle) |
| Thread Pitch | 1.25 mm | ~20.3 TPI |