Grub Screws, what sizes are the most popular with motor pulleys?

What size grub screws are needed for a 16T 12mm motor pulleys?

M4 for me.


M4. whats the length and width? im new to this stuff.

5mm long should be fine. An M4 threaded grub screw is 4mm in diameter.


ok cool thanks.

I seen M3.M4 and M5 grub screws used in pulleys