Mitsubishi MMT16IR250ISO-S VP15TF Internal Threading Insert
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MMT16IR250ISO-S VP15TF
Mitsubishi Materials | Internal ISO Metric Threading | 2.5mm Pitch
The Mitsubishi MMT16IR250ISO-S VP15TF is a heavy-duty internal threading insert engineered for large-pitch 2.5mm ISO metric threads (standard for M18 to M22 fasteners). As a flagship component of the MMT series, this insert features the specialized -S type 3D molded chipbreaker. This is critical for internal CNC threading where the volume of material removed per pass is significant; it ensures chips are curled tightly and evacuated safely from the bore. Coated with VP15TF Miracle PVD, it offers industry-leading performance when threading stainless steel, alloy steels, and ductile iron.
Technical Specifications
| ISO/Metric Designation | MMT16IR250ISO-S |
|---|---|
| ANSI Equivalent (Inch) | 16IR 2.5 ISO-S (3/8" IC) |
| Thread Profile / Angle | ISO Metric 60° (Full Form) |
| Thread Pitch | 2.5 mm |
| Grade / Coating | VP15TF (Miracle Al-Ti-N PVD) |
VP15TF Miracle Grade
The VP15TF grade is a micro-grain carbide substrate combined with Mitsubishi’s proprietary Miracle (Al-Ti-N) coating. This grade is the gold standard for indexable threading due to its incredible heat resistance and toughness. It excels in preventing built-up edge (BUE), making it the preferred choice for 300 and 400 series stainless steels and gummy low-carbon steels.
-S Type 3D Chipbreaker
Large 2.5 pitch internal threads produce thick, stiff chips. The -S molded geometry is designed to reduce cutting resistance by up to 20% compared to flat inserts. It curls chips away from the thread flank, protecting the internal thread surface finish and significantly extending the life of your threading boring bar.
Recommended Cutting Parameters
| Workpiece Material | Cutting Speed ($v_c$) | Recommended No. of Passes |
|---|---|---|
| Carbon Steels (P10-P30) | 80 - 160 m/min | 12 - 18 |
| Stainless Steels (M10-M30) | 60 - 120 m/min | 14 - 22 |
| Alloy Steels (High Hardness) | 70 - 140 m/min | 13 - 20 |
MMTIR INTERNAL TOOLING SYSTEM
This 16IR insert is optimized for use with Mitsubishi MMTIR internal boring bars. Ensure the boring bar has sufficient clearance for a 2.5mm pitch profile.
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 | 2.5 mm | ~10.16 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.