Neodymium Disc Magnet 30 x 5 mm N48 Diametrically Magnetised
 
A neodymium magnet (NdFeB) is small but very strong. It is made from a special alloy and magnetised in a strong magnetic field during manufacture. It is noticeably stronger than conventional ferrite magnets and generally has a protective coating because the material is prone to corrosion. N48 indicates the magnetic grade; a higher number generally means a stronger magnet, with grades commonly ranging from N35 to N52. This type is diametrically magnetised, so its pole orientation differs from the usual arrangement. Orientation matters during installation.
 
The larger size suits more demanding tasks, including strong attachments, handling, assembly and robust projects, also in industrial environments. The metal material and thickness strongly affect performance. A thicker, flatter surface gives a better hold.
 
Warning: keep away from children. Strong attraction can cause pinching injuries, and the magnet can chip easily. Store magnets with spacers and avoid impacts. Keep them away from bank cards, sensitive electronics and medical devices.