Mitsubishi MMT16ER140UN-S VP15TF External Threading Insert
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MMT16ER140UN-S VP15TF
Mitsubishi Materials | External Unified National (UN/UNC/UNF) | 14 TPI
The Mitsubishi MMT16ER140UN-S VP15TF is a precision-ground external threading insert engineered for 14 TPI (Threads Per Inch) Unified National thread profiles. Designed for high-performance CNC threading of bolts and mechanical fasteners, this 60° full-form insert ensures high accuracy and repeatability. It features the specialized -S type 3D molded chipbreaker to prevent chip entanglement during external cycles. Coated with the proprietary VP15TF Miracle PVD, this insert is the ultimate solution for threading stainless steel, alloy steels, and carbon steels.
Technical Specifications
| ISO/Metric Designation | MMT16ER140UN-S |
|---|---|
| Thread Profile | Unified National (UN) 60° 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 premier universal PVD solution. It combines a high-toughness micro-grain substrate with the Miracle (Al-Ti-N) coating. This provides the indexable threading insert with extreme fracture toughness and anti-welding properties. It is specifically designed to stop built-up edge (BUE) when threading gummy stainless steels (304/316).
-S Type 3D Chipbreaker
External threading generates continuous chips that can ruin the thread surface finish. The -S molded chipbreaker uses a 3D geometry to curl and break chips into small, manageable pieces. This reduces cutting resistance and heat buildup, ensuring consistent thread quality even in high-volume production.
Recommended Cutting Parameters
| Workpiece Material | Cutting Speed ($v_c$) | Recommended No. of Passes |
|---|---|---|
| Carbon Steel (S45C) | 100 - 180 m/min | 10 - 15 |
| Stainless Steel (SUS304) | 80 - 140 m/min | 12 - 18 |
| Alloy Steel (SCM440) | 90 - 160 m/min | 11 - 16 |
MMTE EXTERNAL TOOLING SYSTEM
This 16ER insert is designed for use 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 (Unified National) |
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.