Mitsubishi MMT16IR190W-S VP15TF Internal Threading Insert
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MMT16IR190W-S VP15TF
Mitsubishi Materials | Internal Whitworth (BSW/BSF/G) | 19 TPI
The Mitsubishi MMT16IR190W-S VP15TF is a precision internal threading insert designed for 19 TPI Whitworth (55°) thread profiles. Specifically optimized for small-diameter internal applications such as G 1/4" pipe threads and fine Whitworth fasteners, this insert is a cornerstone for high-accuracy CNC threading. It features the advanced -S type 3D molded chipbreaker, designed to handle the difficult task of chip evacuation in confined bores. Utilizing the VP15TF Miracle PVD coating, it is the industry’s most reliable choice for threading stainless steel, carbon steel, and alloyed materials.
Technical Specifications
| ISO/Metric Designation | MMT16IR190W-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 the premier universal PVD solution from Mitsubishi Materials. It features a micro-grain carbide substrate with the Miracle (Al-Ti-N) coating. This provides the indexable threading insert with extreme heat resistance and anti-welding properties, preventing built-up edge (BUE) when internal threading gummy materials like 304/316 stainless steel.
-S Type 3D Chipbreaker
Internal threading often suffers from "chip nesting." The -S molded chipbreaker uses a 3D rake face to curl chips into tight spirals, ensuring they are easily flushed out of the bore by the boring bar's coolant. This maintains a clean thread surface finish and prevents sudden edge chipping on fine 19 TPI profiles.
Recommended Cutting Parameters
| Workpiece Material | Cutting Speed ($v_c$) | Recommended No. of Passes |
|---|---|---|
| Carbon Steel (S45C) | 90 - 160 m/min | 8 - 14 |
| Stainless Steel (SUS304) | 70 - 130 m/min | 10 - 16 |
| Alloy Steel (SCM440) | 80 - 140 m/min | 9 - 15 |
INTERNAL TOOLING SYSTEM
This 16IR insert is optimized for Mitsubishi MMTIR internal boring bars and standard 16mm internal threading holders.
Shop MMTIR Internal Bars →Metric vs. Inch Cross-Reference
| Feature | Metric Designation | Inch Designation (ANSI) |
|---|---|---|
| Insert Size | 16 IR | 16IR (3/8" Inscribed Circle) |
| Thread Pitch | 1.337 mm | 19 TPI (Whitworth) |