Open BCI snap cables
https://shop.openbci.com/products/emg-ecg-snap-electrode-cables
The cables listed here are 4mm snape, but when I measure the head of the snape cables I bought previously, it is 8mm diameter. \
1) Is this a different size? or is 4mm the radius and not the diameter?
2) Will those cables be compatible with these buttons? https://www.amazon.com/PRYM-390360-fasteners-silver-coloured-pieces/dp/B0052DHVI4
Comments
Suggest you email to contact at openbci.com to ask about exact dimensions.
Regarding the standardized ECG EMG snap connectors:
https://www.google.com/search?q=ecg+snap+connector+mm+size
The male snap post seems to be nominally 4 mm or 3.9 mm diameter in size. You may be confusing the post size with the larger diameter of the stamped snap base.
William