Mitsubishi MMT16IR120UN-S VP15TF Internal Threading Insert
30-Day Free Returns
Free Worldwide Shipping
MMT16IR120UN-S VP15TF
Mitsubishi Materials | Internal Unified National (UN/UNC/UNF) | 12 TPI
The Mitsubishi MMT16IR120UN-S VP15TF is a premium internal threading insert engineered for 12 TPI (Threads Per Inch) Unified National thread profiles. This 60° full-form insert is the professional choice for internal CNC threading of nuts, manifolds, and high-pressure fittings. Featuring the advanced -S type 3D molded chipbreaker, it solves the critical challenge of chip evacuation in blind holes and deep bores. Coated with the high-performance VP15TF Miracle PVD coating, this insert offers industry-leading longevity when threading stainless steel, carbon steels, and alloyed materials.
Technical Specifications
| ISO/Metric Designation | MMT16IR120UN-S |
|---|---|
| Thread Profile | UN/UNC/UNF (Unified National) 60° Full Form |
| Threads Per Inch (TPI) | 12 TPI |
| Insert Size (IC) | 9.525 mm (3/8") |
| Grade / Coating | VP15TF (Miracle Al-Ti-N PVD) |
VP15TF Miracle Grade
The VP15TF grade is the benchmark for indexable threading. It utilizes a micro-grain carbide substrate with Mitsubishi's Miracle (Al-Ti-N) PVD coating. This provides extreme resistance to heat and built-up edge (BUE), which is vital when threading gummy materials like 316 stainless steel where chip welding often occurs.
-S Type 3D Chipbreaker
Internal threading often suffers from "chip nesting." The -S molded chipbreaker utilizes a 3D rake geometry to curl chips into tight spirals. This ensures chips are easily flushed out by the boring bar's coolant, protecting the thread surface finish and preventing sudden tool breakage in confined bores.
Recommended Cutting Parameters
| Workpiece Material | Cutting Speed ($v_c$) | Recommended No. of Passes |
|---|---|---|
| Carbon Steel (S45C) | 90 - 160 m/min | 10 - 16 |
| Stainless Steel (304/316) | 70 - 130 m/min | 12 - 18 |
| Alloy Steel (SCM440) | 80 - 140 m/min | 11 - 17 |
MMTIR INTERNAL TOOLING SYSTEM
This 16IR insert is optimized for Mitsubishi MMTIR internal boring bars and standard 16mm 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) |
| Thread Pitch | 2.117 mm | 12 TPI (Unified National) |