This is a small neodymium rod magnet, the material is rare earth neodymium, the specific size is 3.5mm in diameter, 4mm in thickness. The tolerance we can make between ±0.03~0.05mm by your requirment. The direction of magnetizing is axial and the surface magnetic strength is more than 3200 gauss. The coating is nickel with silvery white, but if you need better performance, you can choose epoxy or chrome, but the price of process will need more. This magnet can be widely used in industrial, precision instruments, dolls, smart homes, lamps, door and window latches, medical equipment, etc.
The thickness measurement of strong power neodymium cylinder magnet 3.5 x 4mm:
The sample display of 4mm thick cylinder ndfeb magnet 3.5mm dia x 4mm thin:
Other size cylinder neodymium magnet:
3mm diameter rod cylinder neodymiummagnet 3x8 mm
N38 3mm diameter small rod neodymiummagnet D3x5mm (1/8x 3/16")
Small Diameter Cylinder Strong MagnetFor Miniatures 1.5mm x 3mm