Mitsubishi MMT16IR110W-S VP15TF Internal Threading Insert
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MMT16IR110W-S VP15TF
Mitsubishi Materials | Internal Whitworth (BSW/BSF/G) | 11 TPI
The Mitsubishi MMT16IR110W-S VP15TF is a high-performance internal threading insert engineered for 11 TPI Whitworth (55°) thread profiles. Designed for internal CNC threading of BSW/BSF fasteners and G 1/2" to G 7/8" pipe fittings, this full-form insert ensures perfect thread crests and roots. It features the advanced -S type 3D chipbreaker, specifically designed to eliminate chip nesting in deep bores. Coated with VP15TF Miracle PVD, this insert provides the ultimate durability for threading stainless steel, alloy steel, and carbon steel.
Engineering Specifications
| ISO Designation | MMT16IR110W-S |
|---|---|
| ANSI Style Model | 16IR 11W-S (3/8" IC) |
| Thread Profile | Whitworth 55° Full Form |
| Threads Per Inch | 11 TPI |
| Grade / Coating | VP15TF (Miracle Al-Ti-N PVD) |
VP15TF Miracle Grade
The VP15TF grade is the industry's benchmark for indexable threading. It utilizes a micro-grain carbide substrate with a proprietary Miracle (Al-Ti-N) PVD coating. This grade offers extreme toughness and prevents built-up edge (BUE), making it ideal for the high-pressure environment of internal Whitworth threading in gummy materials like 316 stainless steel.
-S Type 3D Chipbreaker
The -S molded chipbreaker is specifically engineered for internal chip control. Fine Whitworth threads can often produce stringy chips that get trapped in the bore. The 3D geometry forces 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) | 90 - 160 m/min | 12 - 18 |
| Stainless Steel (304/316) | 70 - 130 m/min | 14 - 22 |
| Alloy Steel (SCM440) | 80 - 140 m/min | 13 - 20 |
INTERNAL TOOLING COMPATIBILITY
This 16IR insert is optimized for Mitsubishi MMTIR internal boring bars. For 11 TPI, ensure high-pressure coolant is utilized.
Shop MMTIR Internal Bars →Metric vs. Inch Cross-Reference
| Feature | Metric (ISO Model) | Inch Equivalent (ANSI) |
|---|---|---|
| Insert Size | 16 IR | 16IR (3/8" Inscribed Circle) |
| Thread Pitch | 2.309 mm | 11 TPI (Whitworth) |