Specialist for premium permanent magnets materials
Specialist for premium permanent magnets materials
Specialist for premium permanent magnets materials
PARYLENE C coated Neodymidium Magnets Disc Magnets 3mm x 4mm
magnets
magnets
magnets
PARYLENE C coated Neodymidium Magnets Disc Magnets 3mm x 4mm
magnets
magnets
magnets

Technical specification:

Shape: Round rod

Size: D3 x 4mm (diameter x thickness)

Default tolerance: +/-0.1mm Or customize as required

Plating: Parylene C

Magnetism direction: Axial Or Customized

Material: NdFeB (sintered neodymium-iron-boron)

Grade: N35

CharacteristicSymbolUnitValue
DensityDg/cm7.45-7.65
Vickers HardnessHvD.P.N620
Compression StrengthC.SN/mm2780
Coefcient of Thermal ExpansionC//10-6/°C3.4
10-6/°C-4.8
Electrical Resistivityƿµ Ω.cm1.8x10 x^(-4)
Temperature coefcient of resistivityα10x^(-4)/°C2
Electrical ConductivityσkCal/(m.h.°C)0.667
Thermal ConductivitykkCal/(kg.°C)8.9551
Specifc Heat Capacity ckg/mm20.12
Tensile StrengthσUTS, or SU Mpa80
Young's Modulusλ / E10-12m2/N 0.16x1011
Flexural Strengthβ10-12m2/N 9.8
Compressibilityσ10-12m2/N 9.8
RigidityE.IN/m20.64
Poisson's Ratioν 
0.24
Curie TemperatureTc°C 310-380


NdFeB magnets are sintered anisotropic materials - they have a preferred direction of magnetisation locked into their structure.
Neodymium magnets come in many shapes and sizes, and different shapes have corresponding magnetization directions. 

Disk, cylindrical and ring magnets can be magnetized Axially or Radially. Axially magnetized disc magnets have north and south pole s on a large flat surface. Radially magnetized disc magnets have north and south poles on the sides of the circle.

In order to let the customer distinguish the N-S pole easily, we can offer North / South Pole marked, this is a simply marking on the North / South pole of the magnet - does not affect tolerance. The marking of polarity is not the default service, we will not apply this to our production unless the customers make their own requests.