Mitsubishi MMT11IRA55-S VP15TF Threading Insert | MMC Japan
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MMT11IRA55-S VP15TF
Mitsubishi Materials | MMT Series Internal 55° Partial Profile
The Mitsubishi MMT11IRA55-S VP15TF is a high-performance internal threading insert featuring a 55-degree partial profile. This versatile tool is designed to produce a range of Whitworth, BSW, and G-series (BSP) threads. Engineered for the MMTIR boring bar series, the "-S" designation indicates a 3D molded chipbreaker, which provides superior chip evacuation in restricted internal bores. Coated with VP15TF Miracle PVD, this insert is a universal powerhouse for steel, stainless steel, and cast iron.
Technical Specifications
| ISO/Metric Designation | MMT11IRA55-S |
|---|---|
| Thread Profile / Angle | 55° Partial Profile (Whitworth/G/BSW) |
| Pitch Range | 0.5 - 1.5 mm / 48 - 16 TPI |
| Insert Size (IC) | 6.35 mm (1/4") |
| Grade / Coating | VP15TF (Miracle PVD Coated) |
VP15TF Miracle Grade
The VP15TF grade is an industry favorite for indexable threading. It utilizes a high-toughness substrate with an Al-Ti-N Miracle coating. This provides extreme wear resistance and anti-welding properties, which are critical when threading stainless steel or exotic materials that tend to cause built-up edge (BUE).
-S Type (3D) Chipbreaker
In internal operations, chip control is the biggest challenge. The -S type 3D geometry forces the chip to curl and break away from the thread wall. This prevents the "bird-nesting" effect that can destroy the surface finish or damage the threading bar during the cycle.
Recommended Cutting Parameters
| Workpiece Material | Cutting Speed ($v_c$) | Number of Passes |
|---|---|---|
| Mild/Carbon Steel | 70 - 150 m/min | 6 - 12 |
| Stainless Steel (SUS304) | 50 - 110 m/min | 8 - 14 |
| Cast Iron (GG25) | 60 - 120 m/min | 6 - 10 |
MMTIR HOLDER SYSTEM
This 11IRA55 insert is compatible with Mitsubishi MMTIR internal boring bars and standard internal threading bars.
Shop MMTIR Boring Bars →Metric vs. Inch Cross-Reference
| Feature | Metric Standard | Inch Standard (ANSI) |
|---|---|---|
| Insert Size (L) | 11 mm | 1/4" IC |
| Pitch Range (P) | 0.5 - 1.5 mm | 48 - 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.