Mitsubishi MMT16IR140W-S VP15TF Internal Threading Insert
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MMT16IR140W-S VP15TF
Mitsubishi Materials | Internal Whitworth (BSW/BSF/G) | 14 TPI
The Mitsubishi MMT16IR140W-S VP15TF is a precision-engineered internal threading insert designed for 14 TPI Whitworth (55°) thread profiles. Ideal for BSW/BSF fasteners and G 3/8" to G 1/2" parallel pipe threads, this full-form insert ensures perfect thread crests and roots. For internal CNC threading, chip evacuation is critical; this insert features the specialized -S type 3D molded chipbreaker to prevent chip nesting within the bore. Coated with VP15TF Miracle PVD, it provides superior longevity when threading stainless steel, carbon steel, and alloyed materials.
Technical Specifications
| ISO/Metric Designation | MMT16IR140W-S |
|---|---|
| Thread Standard | Whitworth 55° (BSW, BSF, G-BSP) |
| 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 industry-leading fracture toughness and anti-welding properties. It is specifically designed to stop built-up edge (BUE) when internal threading tough alloys or gummy stainless steels.
-S Type (3D) Chipbreaker
The -S molded chipbreaker utilizes 3D geometry to force chips into a tight spiral. In internal operations, this is essential to ensure chips are curled and flushed out by the boring bar's coolant, preventing the recutting of chips which ruins the surface finish and leads to sudden insert failure.
Recommended Cutting Parameters
| Workpiece Material | Cutting Speed ($v_c$) | Recommended No. of Passes |
|---|---|---|
| Carbon Steel (S45C) | 90 - 160 m/min | 10 - 16 |
| Stainless Steel (304/316) | 70 - 130 m/min | 12 - 18 |
| Alloy Steel (SCM440) | 80 - 140 m/min | 11 - 17 |
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 Designation | Inch Designation (ANSI) |
|---|---|---|
| Insert Size | 16 IR | 16IR (3/8" Inscribed Circle) |
| Thread Pitch | 1.814 mm | 14 TPI (Whitworth) |
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.