Mitsubishi MMT16IR140BSPT-S VP15TF Internal Threading Insert
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MMT16IR140BSPT-S VP15TF
Mitsubishi Materials | Internal BSPT (Whitworth) Pipe Threading | 14 TPI
The Mitsubishi MMT16IR140BSPT-S VP15TF is a premium internal threading insert engineered for 14 TPI British Standard Pipe Taper (BSPT) profiles. Featuring a 55° Whitworth thread form, this insert is the industry standard for creating leak-proof internal pipe connections. Designed for high-performance CNC threading, it incorporates the advanced -S type 3D chipbreaker to solve the common issue of chip nesting inside the bore. Coated with VP15TF Miracle PVD, it is the most versatile solution for threading stainless steel, carbon steels, and tough alloy materials.
Technical Specifications
| ISO/Metric Designation | MMT16IR140BSPT-S |
|---|---|
| Thread Standard | BSPT (Internal Tapered Pipe) |
| 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 is Mitsubishi's premier universal PVD grade. By combining a micro-grain carbide substrate with the Miracle (Al-Ti-N) coating, this indexable threading insert achieves a perfect balance of toughness and wear resistance. It effectively prevents built-up edge (BUE), which is vital for maintaining the strict tolerances of tapered pipe threads in gummy materials like 304/316 stainless steel.
-S Type 3D Chipbreaker
The -S molded chipbreaker is a game-changer for internal operations. In internal threading, chips often get trapped, causing surface scratches or tool failure. The 3D geometry of the -S breaker forces the chip to curl tightly and break, ensuring it can be easily flushed out by high-pressure coolant from the boring bar.
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 |
MMTIR INTERNAL 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 | 1.814 mm | 14 TPI (BSPT) |