Mitsubishi MMT16IR125ISO-S VP15TF Threading Insert | MMC Japan
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MMT16IR125ISO-S VP15TF
Mitsubishi Materials | Internal ISO Metric Threading | 1.25mm Pitch
The Mitsubishi MMT16IR125ISO-S VP15TF is a precision-engineered internal threading insert designed for high-accuracy 1.25mm pitch ISO metric threads. Part of the world-renowned MMT series, this insert is the go-to solution for internal CNC threading where chip evacuation and edge toughness are critical. Featuring the advanced -S type 3D chipbreaker and the legendary VP15TF Miracle PVD coating, this insert excels in threading stainless steel, alloy steels, and general carbon steels, providing a superior surface finish and extended tool life.
Technical Specifications
| ISO Designation | MMT16IR125ISO-S |
|---|---|
| Thread Profile / Angle | ISO Metric 60° (Full Form) |
| Thread Pitch | 1.25 mm |
| 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 premier universal PVD grade. By pairing a micro-grain carbide substrate with the Miracle (Al-Ti-N) coating, it provides an optimal balance of wear resistance and toughness. This is the top choice for indexable threading in medium-to-low speed ranges, especially where adhesion resistance is needed to prevent built-up edge (BUE) in stainless steel.
-S Type 3D Chipbreaker
The -S molded chipbreaker is specifically designed for internal threading. Because chips can become trapped inside the bore, the 3D geometry forces the chip to curl tightly and break early. This ensures chips are easily flushed out by the boring bar's coolant, preventing the surface damage and catastrophic tool failure caused by chip "nesting."
Recommended Cutting Parameters
| Workpiece Material | Cutting Speed ($v_c$) | Total No. of Passes |
|---|---|---|
| Carbon Steels (P10-P30) | 100 - 180 m/min | 7 - 12 |
| Stainless Steels (M10-M30) | 80 - 140 m/min | 9 - 14 |
| Alloy Steels (H-Steels) | 80 - 150 m/min | 8 - 13 |
MMTIR INTERNAL TOOLING SYSTEM
This 16IR insert is designed for Mitsubishi MMTIR internal boring bars and standard 16mm internal threading holders.
Shop MMTIR Internal Bars →Metric vs. Inch Cross-Reference
| Feature | Metric (ISO Model) | Inch Equivalent (ANSI) |
|---|---|---|
| Insert Size | 16 IR | 3 IR (3/8" Inscribed Circle) |
| Thread Pitch | 1.25 mm | ~20.3 TPI (Threads Per Inch) |
Technical FAQ & Buying Guide
Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.
We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:
- For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
- For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
The optimal cutting parameters vary depending on the workpiece hardness and operation type:
- For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
- For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.
We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.
All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.