How To Measure Threads
 

By using a combination of three tools, identifying connectors is easy to do.

A caliper is used to measure the O.D. of a male thread and I.D. of a female thread.
Attachment 3676


NOTE: When comparing your measurements with those on our charts it should be remembered that threads can become worn and distorted from use and you may not compare exactly to the figures in the tables.

For your convenience, dimensions are in both millimeters and inches.
Attachment 3677


The thread pitch gauge measures the threads per inch. For metric threads the gauge will identify the distance between the threads.
Attachment 3678


The seat angle gauge is used by placing the gauge angle on the sealing surface. The centerline of the end fitting and the gauge should be parallel.

In the English system the thread size and pitch (number of threads per inch) are given, along with the thread type.
Attachment 3679

Thanks !

excellent info...............I have a thread pitch gage at work and its very handy :U: