When preparing to cut a 1/8-inch pipe thread, selecting the correct drill bit size is critical to guarantee proper fit and seal. You’ll need to match the drill diameter precisely to the thread specifications, typically using a #30 drill bit for NPT threads.

Choosing the wrong size can lead to leaks or damaged fittings, so understanding the exact dimensions and standards involved is essential before you start drilling. What factors influence this choice beyond just the nominal pipe size?