Mitsubishi MMT16IRG60-S VP15TF Internal Threading Insert
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MMT16IRG60-S VP15TF
Mitsubishi Materials | Internal Partial Profile 60° G-Range (Metric / UN / UNC / UNF)
The Mitsubishi MMT16IRG60-S VP15TF is a heavy-duty internal threading insert engineered for coarse 60-degree profiles. The "G" designation indicates a specialized pitch range of 1.75mm to 3.0mm (14 to 8 TPI), making it the primary choice for CNC threading of large Metric and Unified National (UN) coarse threads. Built with the -S type 3D molded chipbreaker and the proprietary VP15TF Miracle PVD coating, this insert is the industrial standard for threading stainless steel and high-tensile alloys in deep-bore applications where chip evacuation is critical.
Technical Specifications
| ISO/Metric Designation | MMT16IRG60-S |
|---|---|
| Thread Profile | 60° Partial Profile (Internal G-Range) |
| Metric Pitch Range | 1.75 - 3.0 mm |
| Inch Pitch Range | 14 - 8 TPI |
| Grade / Coating | VP15TF (Miracle Al-Ti-N PVD) |
VP15TF Miracle Grade
The VP15TF grade is the benchmark for indexable threading reliability. It combines a high-toughness micro-grain carbide substrate paired with Mitsubishi’s Miracle (Al-Ti-N) PVD coating. This provides extreme resistance to built-up edge (BUE) and thermal cracking, ensuring consistent performance when threading gummy materials like 316 stainless steel or alloy steels.
-S Type (3D) Chipbreaker
Large pitch internal threading produces high chip volume. The -S molded chipbreaker utilizes 3D geometry to curl chips into tight spirals, allowing them to be flushed out easily by the internal boring bar's coolant flow. This prevents chip recutting and "nesting," protecting the thread surface finish and extending tool life.
Recommended Cutting Parameters
| Workpiece Material | Cutting Speed ($v_c$) | Typical No. of Passes |
|---|---|---|
| Carbon Steel (S45C) | 90 - 160 m/min | 12 - 20 |
| Stainless Steel (SUS304) | 70 - 130 m/min | 14 - 24 |
| Alloy Steel (SCM440) | 80 - 140 m/min | 13 - 22 |
MMTIR INTERNAL TOOLING SYSTEM
This 16IR G60 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 | 1.75 - 3.0 mm | 14 - 8 TPI |