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NdFeB Magnets

Neodymium Iron Boron (NdFeB), also known as Rare Earth Iron magnets are mainly comprised of iron, neodymium, boron and other trace elements is the strongest permanent magnets currently produced and has excellent magnetic properties, which allow this third generation magnetic material to be compact in size over traditional permanent magnets.

Caution

1.The magnetized products should be kept away from floppy disks, magnetic CARDS, 

magnetic tapes, credit CARDS, electronic devices and electronic instrument boards, 

pacemakers and other medical devices or similar objects.

2.Please pay full attention to avoid any finger injury when applying the magnetized product since it possesses strong magnetic force.

3.Please pay full attention to avoid any damages or chips during transport and handling

since NdFeB and SmCo magnet possesses weak impact resistance. 

N54 N52 52M N50 50M 50H 48M 48H 48SH 45H 45SH 42H 42SH 40SH 40SH 38SH 35SH 38UH 35UH 54SH 52SH 50SH 52UH 50UH 48UH 45UH 48EH 45EH 42EH 40EH 45AH 42AH 40AH 38AH


N54 N50 N48 N45 52M 50M 48M 45M 42M 52H 50H 48H 45H 42H 40H 50SH 48SH 45SH 42SH 40SH 38SH 45UH 42UH 40UH 38UH 35UH 42EH 40EH 38EH 35EH 33EH 35AH 33AH 30AH 28AH


ItemParametersReference Value

Additional magnetic

properties

  (α(Br))/(%/K) Temp.Coeff.ofBr-0.08~-0.12
 (β(Hcj))/(%/K)Temp.Coeff.of Hcj-0.42~-0.70
 (Tc)/(°C)Curie Temperature310~380
  (μrec)/(-)Recoil Permeability1.05

Mechanical and

physical properties

(g/cm3) Density7.45~7.70
(Hv) Vickers Hardness650
(μΩ?m)Electrical Resistivity1.4
(MPa) Compressive Strength1050
(MPa)Tensile Strength80
(MPa)Bending Strength290
(W/(m?K))Thermal Conductivity 6~8
(GPa) Young's Modulus160
Coefficient of Thermal Expansion(C ⊥)-1.5
Coefficient of Thermal Expansion(C //)6.5




Dimension Range(mm)Plan view size(mm)Parallelism(mm)Perpendicularity (mm)
0.5≤L≤10±0.03±0.030.3 degree for adjacent sides
10≤L≤50±0.05±0.05
L>50±0.1±0.1



Dimension Range(mm)Cylindricity(mm)Tolerance(mm)Parallelism(mm)
1≤D≤5±0.02±0.02±0.02
5≤D≤25±0.03±0.05±0.03
25≤D≤50±0.05±0.05±0.05
D>50±0.05±0.1±0.1



Dimension Range(mm)Cylindricity(mm)Tolerance(mm)Parallelism(mm)
1≤d≤3±0.02±0.02±0.02
3≤d≤5±0.04±0.03±0.02
5≤d≤15±0.05±0.05±0.03
d>15±0.1±0.05±0.1



ItemDimension Range(mm)公差
ThicknessT≤10±0.04
10<T≤25±0.05
LengthL≤10±0.03
10< L≤25±0.03
25< L≤63±0.04
L>63±0.06
Chordal LengthW>63±0.05
W>63±0.06




Since NdFeB magnets easily corrode, it is often coated to protect against this. Traditional coatings are Nickel, Zinc, and Epoxy with other options available. Selection of a coating should be discussed early on in the design and application process.

>> Inorganic: White Zinc, Colour Zinc, Nickel, Copper+NickelNickel+Copper+Nickel

>> Organic: Epoxy

>> Temporary: Phosphating, Blueing






 


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