Mitsubishi MMT16ER250ISO-S VP15TF Threading Insert | MMC Japan
30-Day Free Returns
Free Worldwide Shipping
MMT16ER250ISO-S VP15TF
Mitsubishi Materials | MMT Series External ISO Metric 2.5mm Pitch
The Mitsubishi MMT16ER250ISO-S VP15TF is a high-performance external threading insert specifically engineered for large 2.5mm pitch ISO metric threads (e.g., M18, M20, M22 standard bolts). Designed for the most demanding CNC threading applications, this insert utilizes the -S type 3D molded chipbreaker. This specialized geometry is critical for managing the high chip volume generated by a 2.5mm pitch, effectively curling and breaking chips to prevent surface marring. Coated with VP15TF Miracle PVD, it offers the ultimate durability for threading carbon steel, stainless steel, and cast iron.
Technical Specifications
| ISO/Metric Designation | MMT16ER250ISO-S |
|---|---|
| ANSI Equivalent (Inch) | 16ER 2.5 ISO-S (3/8" IC) |
| Thread Profile / Angle | ISO Metric 60° (Full Form) |
| Thread Pitch | 2.5 mm |
| Grade / Coating | VP15TF (Miracle Al-Ti-N PVD) |
VP15TF Miracle Grade
The VP15TF grade features a specialized micro-grain carbide substrate and Mitsubishi's proprietary Miracle (Al-Ti-N) PVD coating. It is renowned for its high fracture toughness and adhesion resistance. When indexable threading stainless steel or alloy steel, VP15TF prevents the workpiece material from welding to the edge, significantly extending tool life compared to standard coatings.
-S Type (3D) Chipbreaker
The -S molded chipbreaker is an industry leader in chip control. Large pitch threading usually produces thick, stiff chips that are hard to break. The 3D rake angle on the -S breaker reduces cutting forces and guides the chip away from the thread flank, preventing the "re-cutting" of chips and ensuring a smooth, mirror-like thread finish.
Recommended Cutting Parameters
| Workpiece Material | Cutting Speed ($v_c$) | Recommended No. of Passes |
|---|---|---|
| Carbon Steel (S45C/P) | 90 - 170 m/min | 12 - 18 |
| Stainless Steel (304/316) | 70 - 130 m/min | 14 - 22 |
| Alloy Steel (SCM440/H) | 80 - 150 m/min | 13 - 20 |
MMTE EXTERNAL TOOLING SYSTEM
This 16ER insert is engineered for Mitsubishi MMTE external holders and standard 16mm (3/8" IC) threading bars.
Shop MMTE Holders →Metric vs. Inch Cross-Reference
| Feature | Metric (ISO Model) | Inch Equivalent (ANSI) |
|---|---|---|
| Insert Size | 16 ER | 3 ER (3/8" Inscribed Circle) |
| Thread Pitch | 2.5 mm | ~10.16 TPI (Threads Per Inch) |