![How to ID Metric Threads | Adaptall](/6ky5vhl/591.jpg)
How to ID Metric Threads | Adaptall
For Metric parallel threads, taking a caliper reading of the threads outer diameter in millimetres (mm) will give a reading of the exact thread size but not the thread pitch. For example, a caliper reading of indies it is very likely a 12mm thread. We still do not know however if it is or thread pitch (or some other pitch).