Magnet Shape: Ring with Countersunk (Countersink)
Material: Hard Ferrite (Ceramic) and Steel
Coating: Nickel(Ni)       
Grade(Chinese Stardard):         Y32
Magnet ID:              FPC-40-Y32-Ni 
Detailed magnetic properties data:
Residual Magnetic Flux Density (Br): 4.0-4.2 KGs (mT):  400-420 mT
Intrinsic Coercivity Force (Hcj):    2.01-2.37 KOe    160-190 KA/m
Coercivity Force (Hcb):              2.07-2.45 KOe    165-195 KA/m
Energy Density (BH)max:              3.4-4.0 MGOe     30.0-33.5 KJ/m³
Operating Temperature:               -40 °C to +250 °C
Magnetisation Direction: Axial / Radially magnetized
Pot Magnet Size:
Pot Total height (H):       8 mm
Pot Total diameter (D):     40 mm
Pot Diameter top (d2):      5.5 mm
Pot Diameter bottom (d3):   10.4 mm
Countersunk depth (h3):     3 mm
Tolerance:         +/-2% mm
Delivery time           7-25 days
Measurements

 Main Applications of Magnets
Ferrite, NdFeB & SmCo magnets are found wide application in:
Acoustics: Speakers, microphone;
Transportation: Automobile, Motor Assemblies;
Electronics: Sensors, Instrumentation, Transducer;
Electrical Engineering: Generator, Windmill;
Medical Equipments: MRI (Magnetic Resonance Imaging), Magnet Therapeutic Apparatus;
IT industry: Loudspeakers, Earphones, printer, etc;
Communication equipments: Mobile Phone;
Home appliance: VCD, DVD, Laser;
Promotion Items: Holder/clip/clap;
Aeronautics and Astronautics: Radar;
Hi-Tech Research: Electron Accelerator, PMQ
Light Industry: Gift/Toy/Rubber (fridge) Magnet