What size drill bit would I use to drill hole to then to a 1/4' tap to make threads? Would I be using a 1/4 drill bit or is a 7/32' better
![NPT & NPTF NPS & NPSF Pipe Tap Size Pitch (TPI) Drill Size* (inch) Pitch (TPI) Drill Size (inch) 1/16 27 0.242 (C) - - 1 NPT & NPTF NPS & NPSF Pipe Tap Size Pitch (TPI) Drill Size* (inch) Pitch (TPI) Drill Size (inch) 1/16 27 0.242 (C) - - 1](https://alliedmachine.com/AlliedMachine/media/AlliedMasterPageImages/OnlineTools/Tap%20Drill%20Charts/Thumbnails/LPI_National-Pipe-Threads.jpg)
NPT & NPTF NPS & NPSF Pipe Tap Size Pitch (TPI) Drill Size* (inch) Pitch (TPI) Drill Size (inch) 1/16 27 0.242 (C) - - 1
![BSW BSPP BSPT Pipe Tap Size Pitch (TPI) Drill Size (inch) Pitch (TPI) Drill Size (inch) Pitch (TPI) Drill Size* (inch) 1/16 60 0 BSW BSPP BSPT Pipe Tap Size Pitch (TPI) Drill Size (inch) Pitch (TPI) Drill Size (inch) Pitch (TPI) Drill Size* (inch) 1/16 60 0](https://alliedmachine.com/AlliedMachine/media/AlliedMasterPageImages/OnlineTools/Tap%20Drill%20Charts/Thumbnails/LPI_British-Standard-Pipe-Threads.jpg)