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 |
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This Mitsubishi insert is in stock. 24-hour quote response. ISO 9001 certified. Ships from Hangzhou in 3–7 days.
Technical FAQ & Buying Guide
When choosing CNC cutting tools, check the full model code, dimensions, grade and selected variant before ordering. Do not rely on the product image alone.
For carbide inserts, tool holders, drills and end mills, compare the mounting dimensions, connection type and manufacturer's specifications with your holder or machine. If you are unsure, share your existing part number and machining application with us before ordering.
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Select cutting speed, feed rate and depth of cut using the relevant manufacturer's recommendations for your tool model, workpiece material, machine conditions and coolant method. The same settings are not suitable for every product or application.
Our automatic quantity discount is 6% off for 2–9 items and 12% off for 10 or more items, based on the total product quantity in the cart. Other offers may not combine with this discount; check the applicable offer conditions.
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