Is this an SMA female connector?
Maybe...

The SMA female would generally fit the description and is commonly used in these types of applications.

However...

The threading (I don't really see it in the photos), if present, looks either way too fine or way too coarse. The barrel also looks too short to be SMA, but again that's just the photo?

To test...

Get a 0.312" (5/16") outer-diameter (lands spacing) hex nut with 1/4" 36TPI threading from your local hardware store. 


This is the Tyco Electronics 2-332004-0: 5/16" 1/4-36 Steel Hex Nut

If you don't have good hardware stores (like we have in Silicon Valley), you can order one from Digikey or other online vendors.

If it threads on (don't force it!) then you are almost certainly dealing with an SMA given your other connector properties.

Good luck with your project.