Pipe taps and reamers — Cutting Tools Outlet Guides
What Do NPT and NPS Mean?
NPT is tapered pipe threading while NPS is straight pipe threading; the fitting standard determines the tool.
How to Use a Pipe Tap
Pipe tapping requires the correct taper or straight standard, lubrication and controlled alignment.
Why a Pipe-Tapped Joint Leaks
Leaks may come from the wrong pipe standard, insufficient engagement, damaged threads or poor cleaning.