... via Wire Cutting and grinding etc. Regular Arc magnets or Segment magnets have the following important factors such as, Outer Diameter Or ... Neodymium-iron-boron magnet is one kind of the permanent magnets. Material Grade of NdFeB magnets: Magnet N-( N35, N38, N40, N42, ... separation, magnetic resonance imaging, sensors, loudspeakers etc. 2) The coating of NdFeB magnets can be Zn, Ni, Ni-Cu-Ni, Epoxy, ...