Mitsubishi MMT16ER190W-S VP15TF Threading Insert | MMC Japan
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MMT16ER190W-S VP15TF
Mitsubishi Materials | External Whitworth (BSW/BSF/G) | 19 TPI
The Mitsubishi MMT16ER190W-S VP15TF is a precision-ground external threading insert designed for 19 TPI Whitworth (55°) thread profiles. Commonly used for small-diameter BSW/BSF fasteners and G 1/4" pipe threads, this insert is a staple for high-reliability CNC threading. Engineered with the -S type 3D chipbreaker, it provides superior chip control in external operations. Powered by the VP15TF Miracle PVD coating, it is the industry standard for threading stainless steel, carbon steel, and alloyed metals.
Technical Specifications
| ISO/Metric Designation | MMT16ER190W-S |
|---|---|
| Thread Profile | Whitworth 55° (Full Form) |
| Threads Per Inch (TPI) | 19 TPI |
| 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 benchmark for indexable threading. It utilizes a micro-grain carbide substrate paired with the Miracle (Al-Ti-N) coating. This combination offers high toughness and resistance to built-up edge (BUE), which is vital when machining gummy materials like 304 or 316 stainless steel at 19 TPI pitches.
-S Type 3D Chipbreaker
External threading on fine pitches like 19 TPI can lead to chip recutting. The -S molded chipbreaker uses a 3D geometry to curl chips into small, manageable spirals. This reduces heat friction, extending tool life and ensuring a flawless thread surface finish on every part.
Recommended Cutting Parameters
| Workpiece Material | Cutting Speed ($v_c$) | Recommended No. of Passes |
|---|---|---|
| Carbon Steel (S45C) | 100 - 180 m/min | 8 - 14 |
| Stainless Steel (SUS304) | 80 - 140 m/min | 10 - 16 |
| Alloy Steel (SCM440) | 90 - 160 m/min | 9 - 15 |
EXTERNAL TOOLING SYSTEM
This 16ER insert is fully compatible with Mitsubishi MMTE external holders and standard 16mm (3/8" IC) threading tools.
Shop MMTE Holders →Metric vs. Inch Cross-Reference
| Feature | Metric Designation | Inch Designation (ANSI) |
|---|---|---|
| Insert Size | 16 ER | 16ER (3/8" Inscribed Circle) |
| Thread Pitch | 1.337 mm | 19 TPI (Whitworth) |