Mitsubishi MMT16IR300ISO-S VP15TF Threading Insert | MMC Japan
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MMT16IR300ISO-S VP15TF
Mitsubishi Materials | Heavy-Duty Internal ISO Metric | 3.0mm Pitch
The Mitsubishi MMT16IR300ISO-S VP15TF is a high-performance internal threading insert engineered for large-scale 3.0mm pitch ISO metric threads (standard for M24 and larger fasteners). Designed for high-torque internal CNC threading, this insert features the specialized -S type 3D chipbreaker. This geometry is essential for managing the massive chip volume generated by a 3.0mm pitch within the confines of a bore, ensuring safe evacuation and preventing tool breakage. Coated with VP15TF Miracle PVD, it provides maximum durability for threading alloy steel, stainless steel, and tough cast irons.
Engineering Specifications
| ISO Designation | MMT16IR300ISO-S |
|---|---|
| ANSI Style Model | 16IR 3.0 ISO-S (3/8" IC) |
| Thread Profile | ISO Metric 60° (Full Form) |
| Thread Pitch | 3.0 mm |
| Grade / Coating | VP15TF (Miracle Al-Ti-N PVD) |
VP15TF Miracle Grade
The VP15TF grade utilizes a tough micro-grain carbide substrate paired with Mitsubishi’s proprietary Miracle (Al-Ti-N) PVD coating. It is designed for indexable threading applications requiring high fracture toughness. This universal grade excels at medium-to-low cutting speeds and effectively prevents built-up edge (BUE) in gummy materials like SUS304 stainless steel.
-S Type 3D Chipbreaker
The -S molded chipbreaker is an industry leader in internal chip control. Large 3.0 pitch threads create thick chips that can easily "bird-nest" inside the workpiece. The 3D geometry forces these chips into a tight spiral, allowing them to be flushed out easily by the boring bar's coolant, ensuring a superior internal thread surface finish.
Recommended Cutting Parameters
| Workpiece Material | Cutting Speed ($v_c$) | Recommended No. of Passes |
|---|---|---|
| Carbon Steel (S45C) | 80 - 150 m/min | 14 - 22 |
| Stainless Steel (304/316) | 60 - 120 m/min | 16 - 26 |
| Alloy Steel (SCM440) | 70 - 140 m/min | 15 - 24 |
INTERNAL TOOLING COMPATIBILITY
The 16IR profile is optimized for Mitsubishi MMTIR internal boring bars. For a 3.0mm pitch, ensure your bar has adequate clearance.
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 | 3.0 mm | ~8.47 TPI (Threads Per Inch) |