External diameter
40 [mm] +2,5%/-2,5%
Height
8 [mm] +0,1/-0,1
Magnetizing direction along dimension
8 [mm]
Grade
F30
Magnet type
Ferrite
Maximal hoisting capacity
1,4 [kg]
Maximum working temperature
250 [°C]
Weight
45,22 [g]
Performance parameters
Direction of magnetization along the height means that one circular surface of a magnet makes the N-pole, while the other – opposite – circular surface refers to the S-pole.
The magnetic force value given above, expressed in kilograms, was measured under ideal conditions. A thick iron plate with a smooth, unpainted surface was used. The force required to detach the magnet from the plate was perpendicular to the plate.
For flat magnets and magnets mounted in the open magnetic circuit working temperature may be insignificantly lower. For high magnets and magnets mounted in the closed magnetic circuit working temperature equals max. working temperature for a given material. Curie’s temperature is ~ 450°[C]. Temperature coefficient of remanence TK(Br): ≤ -0,19 %/°[C]. Temperature coefficient of coercivity TK(HcJ): ≥ 0,40 %/°[C].
Ferrite magnets do not require anticorrosive protection. They my be used in water.
As ceramic magnets, ferrite magnets are brittle.
The magnet parameter values presented here are the result of measurements taken on one specific magnet and are used to compare magnets available in the online shop. We recommend testing the magnet yourself under the expected operating conditions.
Magnetic properties of material grade F30
remanence Br |
~0,37 [T] |
coercivity HcB |
min. 175 [kA/m] |
coercivity HcJ |
min. 180 [kA/m] |
| The magnetic properties of the material are not identical for every magnet. The measurement results for different magnets will vary due to the inherent heterogeneity of the magnetic material and the measurement tolerances of the measuring device. |
Physical proprieties
density |
~4,5 [g/cm3] |
resistivity |
104 - 108 [uOhm x cm] |
D40x8/F30 - ferrite magnet
This magnet is circular, cylindrical, shaped like a cylinder or disc.
It is a ferrite magnet, magnetised along the height. It has two poles, which means it is double-sided. Ferrite magnets are well resistant to corrosion and do not require additional protection. It has been manufactured to excellent dimensional tolerances.
The maximum operating temperature is no more than 250 degrees Celsius.
Ferrite magnets stick to metal surface (ferromagnetic materials).