Mitsubishi MMT16IRAG55-S VP15TF Internal Threading Insert
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MMT16IRAG55-S VP15TF
Mitsubishi Materials | Internal Partial Profile 55° AG (Whitworth / BSP / BSW)
The Mitsubishi MMT16IRAG55-S VP15TF is a highly versatile internal threading insert engineered for 55-degree profiles. The "AG" designation identifies this as an expanded-range partial profile tool, capable of cutting pitches from 0.5mm to 3.0mm (48 to 8 TPI). It is the professional choice for CNC threading of internal pipe threads (G/Rp/Rc) and Whitworth fasteners. Featuring the -S type 3D molded chipbreaker and the legendary VP15TF Miracle PVD coating, it solves the common problem of chip nesting in deep-hole internal threading, particularly when machining stainless steel and alloyed materials.
Technical Specifications
| ISO/Metric Designation | MMT16IRAG55-S |
|---|---|
| Thread Profile | 55° Partial Profile (AG Wide Range) |
| Metric Pitch Range | 0.5 - 3.0 mm |
| Inch Pitch Range | 48 - 8 TPI |
| Grade / Coating | VP15TF (Miracle Al-Ti-N PVD) |
VP15TF Miracle Grade
The VP15TF grade is Mitsubishi's benchmark for indexable threading reliability. It combines a high-toughness carbide substrate with a proprietary Miracle (Al-Ti-N) PVD coating. This grade offers extreme resistance to built-up edge (BUE) and plastic deformation, ensuring consistent performance when threading gummy materials like SUS304 and SUS316 stainless steel.
-S Type 3D Chipbreaker
Chip evacuation is the biggest challenge in internal boring. The -S molded chipbreaker utilizes 3D geometry to curl chips into tight spirals, allowing them to be flushed out easily by coolant. This prevents chip recutting and "nesting," protecting the thread surface finish and significantly extending tool life during high-speed CNC operations.
Recommended Cutting Parameters
| Workpiece Material | Cutting Speed ($v_c$) | Typical No. of Passes |
|---|---|---|
| Carbon Steel (S45C) | 90 - 160 m/min | 8 - 18 |
| Stainless Steel (SUS304) | 70 - 130 m/min | 10 - 22 |
| Alloy Steel (SCM440) | 80 - 140 m/min | 9 - 20 |
MMTIR INTERNAL TOOLING SYSTEM
This 16IR AG55 insert is optimized for use with Mitsubishi MMTIR internal boring bars and standard 16mm (3/8" IC) 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) |
| Pitch Range | 0.5 - 3.0 mm | 48 - 8 TPI |
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.