Mitsubishi MMT16ER250ISO-S VP15TF Threading Insert | MMC Japan
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MMT16ER250ISO-S VP15TF
Mitsubishi Materials | MMT Series External ISO Metric 2.5mm Pitch
The Mitsubishi MMT16ER250ISO-S VP15TF is a high-performance external threading insert specifically engineered for large 2.5mm pitch ISO metric threads (e.g., M18, M20, M22 standard bolts). Designed for the most demanding CNC threading applications, this insert utilizes the -S type 3D molded chipbreaker. This specialized geometry is critical for managing the high chip volume generated by a 2.5mm pitch, effectively curling and breaking chips to prevent surface marring. Coated with VP15TF Miracle PVD, it offers the ultimate durability for threading carbon steel, stainless steel, and cast iron.
Technical Specifications
| ISO/Metric Designation | MMT16ER250ISO-S |
|---|---|
| ANSI Equivalent (Inch) | 16ER 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 features a specialized micro-grain carbide substrate and Mitsubishi's proprietary Miracle (Al-Ti-N) PVD coating. It is renowned for its high fracture toughness and adhesion resistance. When indexable threading stainless steel or alloy steel, VP15TF prevents the workpiece material from welding to the edge, significantly extending tool life compared to standard coatings.
-S Type (3D) Chipbreaker
The -S molded chipbreaker is an industry leader in chip control. Large pitch threading usually produces thick, stiff chips that are hard to break. The 3D rake angle on the -S breaker reduces cutting forces and guides the chip away from the thread flank, preventing the "re-cutting" of chips and ensuring a smooth, mirror-like thread finish.
Recommended Cutting Parameters
| Workpiece Material | Cutting Speed ($v_c$) | Recommended No. of Passes |
|---|---|---|
| Carbon Steel (S45C/P) | 90 - 170 m/min | 12 - 18 |
| Stainless Steel (304/316) | 70 - 130 m/min | 14 - 22 |
| Alloy Steel (SCM440/H) | 80 - 150 m/min | 13 - 20 |
MMTE EXTERNAL TOOLING SYSTEM
This 16ER insert is engineered for Mitsubishi MMTE external holders and standard 16mm (3/8" IC) threading bars.
Shop MMTE Holders →Metric vs. Inch Cross-Reference
| Feature | Metric (ISO Model) | Inch Equivalent (ANSI) |
|---|---|---|
| Insert Size | 16 ER | 3 ER (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.