Magnetisation Grade:         N40
Material: Neodymium-Iron-Boron (NdFeB)
Magnet ID:              ND-12030-N40
Plating / Coating:  Nickel (Ni-Cu-Ni) / Double Ni / Zinc (Zn) / Epoxy (Black/Gray)        
Shape:         Disc, Disk, Cylinder, Round  
Disc Magnet Size: 
Disc Total Diameter (D):      120 mm
Disc Total Height (H):        30 mm
Tolerance:         ±0.05 mm
Magnetisation Direction:    Axial  /  Radial   
Residual Magnetic Flux Density (Br): 1250-1280 mT (12.5-12.8 kGs)
Energy Density (BH)max:             302-326 KJ/m³  (38-41 MGOe) 
Coercivity Force (Hcb):              ≥ 907 kA/m ( ≥ 11.4 kOe)  
Intrinsic Coercivity Force (Hcj):    ≥ 955  kA/m ( ≥ 12 kOe)   
Maximum Operation Temperature: 80 °C 
Delivery Time:           14-35 days   
PERMANENT MAGNETS
A permanent magnet is made from a material that is magnetised and creates its own persistent magnetic field. An everyday example is a refrigerator magnet used to hold notes on a refrigerator door. Materials that can be magnetised, which are also the ones that are strongly attracted to a magnet, are called ferromagnetic (or ferrimagnetic). These include iron, nickel, cobalt, some alloys of rare earth metals, and some naturally occurring minerals such as lodestone. Although ferromagnetic (and ferrimagnetic) materials are the only ones attracted to a magnet strongly enough to be commonly considered magnetic, all other substances respond weakly to a magnetic field, by one of several other types of magnetism.