Mitsubishi MMT16ER140BSPT-S VP15TF Threading Insert | MMC Japan
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MMT16ER140BSPT-S VP15TF
Mitsubishi Materials | MMT Series External BSPT (Whitworth) | 14 TPI
The Mitsubishi MMT16ER140BSPT-S VP15TF is a high-precision external threading insert designed for 14 TPI British Standard Pipe Taper (BSPT) profiles. This 55° Whitworth-based tapered thread is essential for pressure-tight sealing in pipe fittings. Engineered with the specialized -S type 3D molded chipbreaker, it delivers superior chip control during CNC threading, preventing the stringy nests commonly associated with pipe threads. Utilizing the VP15TF Miracle PVD coating, this insert offers extreme versatility for threading stainless steel, carbon steel, and alloyed materials.
Technical Specifications
| ISO/Metric Designation | MMT16ER140BSPT-S |
|---|---|
| Thread Standard | BSPT (British Standard Pipe Taper) |
| Threads Per Inch (TPI) | 14 TPI |
| Thread Angle | 55° Full Form |
| Grade / Coating | VP15TF (Miracle Al-Ti-N PVD) |
VP15TF Miracle Grade
The VP15TF grade combines a high-toughness carbide substrate with Mitsubishi's proprietary Miracle (Al-Ti-N) PVD coating. It is widely recognized as the best universal grade for indexable threading, providing unmatched heat resistance and preventing built-up edge (BUE) even when machining gummy materials like 316 stainless steel.
-S Type (3D) Chipbreaker
The -S molded chipbreaker utilizes 3D geometry to optimize chip formation. By reducing cutting forces and curling chips into manageable sizes, it maintains a perfect surface finish on the tapered thread flank. This is critical for ensuring a leak-proof seal in hydraulic and pneumatic connections.
Recommended Cutting Parameters
| Workpiece Material | Cutting Speed ($v_c$) | Recommended No. of Passes |
|---|---|---|
| Carbon Steel (S45C) | 100 - 180 m/min | 10 - 16 |
| Stainless Steel (SUS304) | 80 - 140 m/min | 12 - 18 |
| Alloy Steel (SCM440) | 90 - 160 m/min | 11 - 17 |
MMTE EXTERNAL TOOLING SYSTEM
The 16ER series is perfectly compatible with Mitsubishi MMTE external holders and standard 16mm threading bars.
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 | 1.814 mm | 14 TPI (BSPT) |