Arcade Button Size â
Understanding how to read the Arcade button (threaded) datasheet specificiation is very important so that you know what mounting diameter to cut to exactly fit the threaded buttons.
ISO defined a standard for threaded buttons, see https://www.engineersedge.com/hardware/metric-internal-thread-sizes2.htm for more info. Tap drill size is the diameter of the holes that can fit the button with threads, and it uses the formula (M_SIZE)-(PITCH_SIZE)=MOUNTING_HOLE_DIAMETER, i.e. 28-2=26mm.
Example for M28*P=2 sizes arcade button, tap drill size is 26mm.
COMMON MISCONCEPTION
Most people such as myself mistakenly interpret the M size as the mounting hole diameter requirement, which as you can see, is totally wrong!
Example: 60mm Button â
The 60mm Button is commonly used as pinball Launch Ball button.
Let's use Adafruit 60mm button size for example.
It's datasheet from https://media.digikey.com/pdf/Data Sheets/Adafruit PDFs/1193_Web.pdf
Using the formula (M_SIZE)-(PITCH_SIZE)=MOUNTING_HOLE_DIAMETER, to mount this threaded button securely, I had to cut a mounting hole with diameter of 24-2=22mm
Example: GoldLeaf Button â
GoldLeaf button is convex shaped (flushed) and is very popular for use as pinball flipper and/or nudge buttons. Your finger can rest comfortably in the flushed surface.
As from https://www.ultimarc.com/arcade/buttons/goldleaf-pushbuttons/
The mounting hole diameter is 28-2=26mm.