This magnet is a N42 grade disc magnet, is made of rare earth neodymium. The specific size is 7mm in diameter, 4mm in thickness. This magnet is plated nickel with silvery white and has a strong power, so it is a perfect round magnet to use. This magnet is very popular in medical equipment, precision instruments, luggage buckle, magnetic door and window locks and other applications.
N42 Grade magnet performance data:
The thickness measurement of 4mm thin circular magnet 7 x 4mm(0.03mm~0.05mm tolerance):
Other diameter size of 4mm thick round magnet:
5mm diameter 4mm thick round disc magnet 5x4mm 3500 gauss