Precision Connector dimensions and compatibility, 1.85mm, 2.4mm, 2.92mm, 3.5mm, SMA

This post is for me. These are my notes for myself – but maybe you will get some use out of it. It has been a problem for me, to distinguish these connectors from each other. I couldn’t find a compilation of dimension and compatibility data anywhere online, so I went and made one myself.  Most of the drawings are from Pasternack’s catalog. The pictures are from random internet searches.

These connectors are generally for use at different frequencies, and just because they can mate with each other does not mean they should be used together. Mix-and-match connections can lead to degraded performance, especially at high frequencies.  The main physical danger to the connectors is from damaged connectors -especially SMA- being tightened on a different connector.  If you just want to pass a few GHz and don’t care too much about signal quality, finger-tighten the shells and go ahead and cross-connect to your heart’s content.