Mitsubishi MMT16ER140W-S VP15TF Threading Insert | MMC Japan
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MMT16ER140W-S VP15TF
Mitsubishi Materials | External Whitworth (BSW/BSF/G) | 14 TPI
The Mitsubishi MMT16ER140W-S VP15TF is a precision external threading insert designed for 14 TPI Whitworth (55°) thread profiles. Ideal for BSW, BSF, and G (BSP) parallel pipe threads, this insert is a staple for high-reliability CNC threading. Engineered with the -S type 3D chipbreaker, it effectively manages chip flow in external operations, preventing the "bird-nesting" that compromises surface quality. Powered by the VP15TF Miracle PVD coating, it is optimized for threading stainless steel, carbon steel, and alloyed metals.
Technical Specifications
| ISO/Metric Designation | MMT16ER140W-S |
|---|---|
| Thread Profile | Whitworth 55° (Full Form) |
| Threads Per Inch (TPI) | 14 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.
-S Type 3D Chipbreaker
External threading generates continuous chips that can damage the thread surface finish. The -S molded chipbreaker uses a 3D geometry to curl and snap chips early. This reduces cutting heat and friction, extending tool life during high-volume production of Whitworth fittings.
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 |
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 | 1.814 mm | 14 TPI (Whitworth) |