AN NPT thread sizes

American National Standard Taper Pipe Thread (NPT) - Vixen Horns

NPT Thread Chart

How to Identify PT/NPT/G/Metric thread? - Pneumatic and Automation manufacturer

NPT Thread Dimensions - QC Hydraulics

Threading: Standard Holes

Math Tools - Pipe Diameters, Threads and Sizes

Understanding NPT and Other Pipe Thread Types

What is NPT?

U.S. and International Threaded Connection Standards – Dwyer Instruments Blog