Magnetisation Grade:         N40
Material: Neodymium-Iron-Boron (NdFeB), Neodymium and Steel 
Magnet ID:              NPH-20-N40-Ni
Plating / Coating: Nickel-plated (Ni) / Nickel (Ni-Cu-Ni) / Double Ni    
Shape: Ring / with Hook    
Pot Magnet Size: 
Pot diameter (D): 20 mm
Neck diameter (d): 6 mm
Pot height (H1): 8 mm
Total height without hook (H2): 13 mm
Total height with hook (H3):  29 mm
Thread (M): M3
Hook opening width (a):         3.5 mm
Hook inside diameter (b): 4 mm
Tolerance:         ±0.1 mm
Magnetisation Direction:   Axial      
Residual Magnetic Flux Density (Br): 12.6-13.0 KGs (T):  1.26-1.30 T 
Energy Density (BH)max:              38-41 MGOe   302-326 KJ/m³   
Coercivity Force (Hcb):              ≥10.8 KOe  ≥860 KA/m   
Intrinsic Coercivity Force (Hcj):    ≥12 KOe    ≥955 KA/m   
Maximum Operation Temperature: 80 °C 
Delivery Time:           14-35 days   
Measurements:

Ndfeb Magnet hook
1) Ndfeb arc or segment magnet has superior magnetic properties than other magnets
2) Higher unit magnetic properties 
3) Smaller size and lighter weight in designing devices
4) Mostly an iron based alloy, NdFeB type rare earth magnet is much more prone to surface oxidation or rust, and elimination. Users should consider magnet coating, plating or suitable surface treatment
5) Less prone to chipping during handling
6) Lower temperature coefficient of magnetic properties than ceramic, higher than SmCo type rare earth magnet
7) Irreversible loss at high temperature