Mitsubishi MMT16IRA55-S VP15TF Internal Threading Insert
Price shown is a starting point. Contact us for a precise quote based on your requirements.
MMT16IRA55-S VP15TF
Mitsubishi Materials | Internal Partial Profile 55° (Whitworth / BSP / BSW)
The Mitsubishi MMT16IRA55-S VP15TF is a high-precision internal threading insert designed for 55-degree Whitworth profiles. As a partial profile A-type insert, it offers maximum flexibility, allowing for a pitch range of 0.5mm to 1.5mm (48 to 16 TPI). This versatility makes it the primary tool for CNC threading of internal pipe threads (G/RP) and Whitworth fasteners. Engineered with the -S type 3D molded chipbreaker and the legendary VP15TF Miracle PVD coating, it provides superior chip evacuation in deep-hole internal threading operations, especially when machining stainless steel and tough alloys.
Technical Specifications
| ISO/Metric Designation | MMT16IRA55-S |
|---|---|
| Thread Profile | 55° Partial Profile (Internal) |
| Pitch Range | 0.5 - 1.5 mm / 48 - 16 TPI |
| Insert Size (IC) | 9.525 mm (3/8") |
| Grade / Coating | VP15TF (Miracle Al-Ti-N PVD) |
VP15TF Miracle Grade
The VP15TF grade utilizes a micro-grain carbide substrate with a proprietary Miracle (Al-Ti-N) PVD coating. It is the world-standard for indexable threading due to its extreme resistance to built-up edge (BUE) and heat-induced flank wear. This grade ensures longevity even when threading gummy materials like 316 stainless steel.
-S Type 3D Chipbreaker
Internal threading is prone to chip clogging. The -S molded chipbreaker features a specialized 3D rake that forces chips to curl into tight spirals, allowing the internal boring bar's coolant to flush them out effortlessly. This prevents "chip nesting" and ensures a high-quality thread surface finish.
Recommended Cutting Parameters
| Workpiece Material | Cutting Speed ($v_c$) | Typical No. of Passes |
|---|---|---|
| Carbon Steel (S45C) | 90 - 160 m/min | 6 - 12 |
| Stainless Steel (304/316) | 70 - 130 m/min | 8 - 14 |
| Alloy Steel (SCM440) | 80 - 140 m/min | 7 - 13 |
MMTIR INTERNAL TOOLING SYSTEM
This 16IR insert is optimized for Mitsubishi MMTIR internal boring bars and standard 16mm 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) |
| Max Pitch | 1.5 mm | 16 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.