![NPT 1"x11.5 - 11.5TPI Pitch NPT Helical Flute Internal Carbide Thread Mill with Radial Coolant - (Helicool R HCR Series - Vardex) NPT 1"x11.5 - 11.5TPI Pitch NPT Helical Flute Internal Carbide Thread Mill with Radial Coolant - (Helicool R HCR Series - Vardex)](https://www.ewequipment.co.uk/cdn/shop/products/Helicool-RHCR_66cb5a26-bc69-4699-8d2c-49e0bcfc8562_580x.png?v=1636121322)
NPT 1"x11.5 - 11.5TPI Pitch NPT Helical Flute Internal Carbide Thread Mill with Radial Coolant - (Helicool R HCR Series - Vardex)
![Trying to identify unknown thread. Similar to 1"-12 UNF but 0.03" larger diameter. Appears to be 12 TPI, but could be 11.5? : r/Machinists Trying to identify unknown thread. Similar to 1"-12 UNF but 0.03" larger diameter. Appears to be 12 TPI, but could be 11.5? : r/Machinists](https://preview.redd.it/trying-to-identify-unknown-thread-similar-to-1-12-unf-but-0-v0-i3ld5k45o3gb1.png?width=1080&crop=smart&auto=webp&s=09125df0c2aafe3198a7a6e10dde09b08406191f)
Trying to identify unknown thread. Similar to 1"-12 UNF but 0.03" larger diameter. Appears to be 12 TPI, but could be 11.5? : r/Machinists
![Sandvik Coromant 5857556 CoroThread® 266 Threading Insert, ANSI Code: 266RG-16NT01F115E 1135, 266RG Insert, Triangular Shape, 11.5 TPI, External Thread, NPT Thread, Right Hand Cutting, Manufacturer's Grade: 1135, Material Grade: H, K, M, Sandvik Coromant 5857556 CoroThread® 266 Threading Insert, ANSI Code: 266RG-16NT01F115E 1135, 266RG Insert, Triangular Shape, 11.5 TPI, External Thread, NPT Thread, Right Hand Cutting, Manufacturer's Grade: 1135, Material Grade: H, K, M,](https://cdn.dgisupply.ca/img/product-images/Asset_URL/Sandvik_5857489.jpg)