D25 x d7,5/4,5 x 5 / N38 - NdFeB (neodymium) magnet

D25 x d7,5/4,5 x 5 / N38 - NdFeB (neodymium) magnetD25 x d7,5/4,5 x 5 / N38 - NdFeB (neodymium) magnet€2.20

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Of Price Net Price Gross
1 pcs. €2.20 €2.71
15 pcs. €1.66 €2.04
50 pcs. €1.50 €1.85
100 pcs. €1.45 €1.78
250 pcs. €1.42 €1.75
Available Quantity: 17087 pcs.

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Performance parameters

External diameter

25 [mm] +0,1/-0,1

Aperture diameter for head of a screw

7,5 [mm] +0,1/-0,1

Internal diameter

4,5 [mm] +0,1/-0,1


5 [mm] +0,1/-0,1

magnetizing direction along dimension

5 [mm]

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.



Magnet type


Maximal hoisting capacity

8 [kg]

The pull force was measured by using metal sheet 10 [mm] thick, acting with perpendicular detaching force. The air gap comprised between the metal sheet and a magnet causes reduction in the pull force.

Magnetic field in geometrical center of the magnetic pole surface

0,3 [T]


Nickel (NiCuNi)

Maximum working temperature

≤ 80 [°C]

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 ~ 310°[C]. Temperature coefficient of remanence TK(Br: approx. ~0,12 %/°[C]. Temperature coefficient of coercivity TK(HcJ): approx. -0,6 %/°[C].

Magnetic moment

23900 [nWb]x[m]


17,4 [g]

All the numbers quoted were obtained as a result of tests with one specific item in a room temperature and are intended to serve for comparison of practical magnetic properties of magnets offered by the shop.
Magnetic properties of material grade N38

remanence Br

1,21 - 1,25 [T]

coercivity HcB

min. 899 [kA/m]

coercivity HcJ

min. 955 [kA/m]

energy product (BH)max

286 - 302 [kJ/m3]

Magnetic properties of a particular material, together with its shape, volume, max. working temperature and direction of magnetization have influence on practical magnetic properties of a magnet.
As an example, you will find attached a graph of a course of the II quadrant of magnetic hysteresis loop for a material grade N38.
Physical properties


~7,5 [g/cm3]

Vickers’ hardness (HV)

~600 [kg/mm2]


~144 [uOhm x cm]

17087 Items
Specific References