# BSP and NPT Thread Standards - Technical Comparison NPT threads, standardized under ASME B1.20.1 and referenced in ASTM standards, are predominantly utilized throughout North America. These threads ...
The insert is therefore seated at a sideways angle on an Anvil or Shim. Some manufacurers call it an anvil, and some call it a shim. The anvil orients the cutting edge so that it is perpendicular to ...