what size is m2
The actual diameter of an M3 screw is usually about 2.9mm, an M2.5 screw is 2.4mm and an M2 is 1.9mm. We give both the overall length and the thread length. The clickable size given in the menu on the left is the thread length in the case of pan head and oem wafer head but the overall length for the flat head screws.or instance the difference in the length of a screw that is 2.20 and one that is 2.40 is only the thickness of a business card. A dollar bill is 0.1mm thick and a blonde hair is .04mm. Sizing for oem laptop screws is a bit confusing. When the screws are produced there are +/- allowances on length.