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

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D25 x d5 x 5 / N38 - NdFeB (neodymium) magnet
D25 x d5 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€1.72

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1 pcs. €1.72 €2.12
100 pcs. €1.63 €2.00
240 pcs. €1.55 €1.91
Quantity
Available Quantity: 10349 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
Height
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.
Material
Neodymium
Grade
N38
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]
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].
Coating
Nickel (NiCuNi)
Magnetic moment
23900 [nWb]x[m]
Weight
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 N48

remanence Br 1,37 - 1,42 [T]
coercivity HcB min. 835 [kA/m]
coercivity HcJ min. 875 [kA/m]
energy product (BH)max 366 - 390 [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 N48.

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

density ~7,5 [g/cm3]
Vickers’ hardness (HV) ~600 [kg/mm2]
resistivity ~144 [uOhm x cm]

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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.)

Physical proprieties: density ~7,5 [g/cm3], Vickers’ hardness (HV) ~600 [kG/mm2], resistivity ~144 [uOhm x cm]

Max. working temperature is no more than 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].

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.

Magnetic flux: ~23900 x 10-3 [mWb], for K(Helmholtz coil constant) = 1,14 × 10-4[m]

Magnetic moment: ~23900 x 10-3 [mWb] × 1,14 × 10-4[m] = ~2724,6 x 10-6 [mWb] × [m]

Magnetic field in geometrical center of surface of the magnetic pole, with a distance of 0,7 [mm] is ~0,300 [T]

Pull force: ~8,0 [kg]. The pull force was measured by using smooth 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.

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.

Anticorrosive protection: coating Ni+Cu+Ni. Do not use in water.

Sintered neodymium magnets are brittle (fragile). A neodymium magnet without housing could break after an impact with another strong magnet.

Weight of the magnet: ~17,0 [g]

We recommend testing of a magnet sample in specific conditions.

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

N38
MP25X7,5-4,5X5N38
10349 Items

Specific References

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