Small Nd Rare Earth Disc Magnet Specifications.

Small Neodymium Disc Magnet
Field Strengths & Holding Force

These small NdFeB disc magnets are N42 ~13,000 gauss (1.3T-N42 grade). Field strengths have been calculated using finite element analysis at the surface and 4 places above the central point and are estimated to be within 10% of actual. For surface measurements, these values are more accurate than a magnetometer since such devices have an airgap of at least 0.1mm between the magnet and sensor. The 0mm measurement is a maximum theoretical value that assumes there is no nickel coating.

The holding forces are also theoretical maximums based on optimum permeability, thickness, area of the metal attached to and no nickel or other coating. The attractive/repulsive force of 2 identical magnets is double this value.

N42 grade: ~13,000 gauss (1.3T)
nickel-copper-nickel coated
size tolerance for dimensions <10mm: +/- 0.05mm
size tolerance for dimensions >10mm: +/- 0.1mm
magnet strength variance piece to piece: <8%
80C maximum operating temperature

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Scientific notation explained:
1.15E+03=1150 1.15E+02=115 1.15E+01=11.5

1.15E+00=1.15 1.15E-01=0.115 1.15E-02=0.0115

American & Canadian Coin Sizes: Smallest to Largest
Dime: ~18x1.2mm; Penny: ~19x1.45mm; Nickel: ~21x1.75mm; Quarter: ~24x1.6mm.

Field Strengths (in gauss) at 5 Distances (in mm); Holding Force in 3 Units

Size (mm)

0.1

100

lbs

gms

3x1

3.66E+03

3.46E+03

1.62E+03

1.25E+01

1.00E-02

0.4

189

4x1.5

3.96E+03

3.79E+03

2.20E+03

3.06E+01

4.00E-02

0.8

378

2.5x1

4.12E+03

3.83E+03

1.47E+03

8.76E+00

1.00E-02

0.4

158

5x1

2.45E+03

2.39E+03

1.67E+03

3.29E+01

4.00E-02

0.7

315

5x2.5

4.67E+03

4.49E+03

2.92E+03

6.89E+01

1.00E-01

1.7

788

7.5x1

1.70E+03

1.68E+03

1.41E+03

6.72E+01

9.00E-02

1.0

472

7.5x2.5

3.66E+03

3.58E+03

2.80E+03

1.42E+02

2.20E-01

2.6

1181

7.5x5

5.28E+03

5.14E+03

3.90E+03

2.23E+02

4.30E-01

5.2

2362

10x1

1.29E+03

1.28E+03

1.16E+03

1.05E+02

1.60E-01

1.4

630

10x2.5

2.95E+03

2.91E+03

2.49E+03

2.25E+02

4.00E-01

3.5

1574

10x5

4.67E+03

4.58E+03

3.78E+03

3.58E+02

7.60E-01

6.9

3149

10x7.5

5.49E+03

5.38E+03

4.39E+03

4.43E+02

1.11E+00

10.4

4724

12.5x1

1.04E+03

9.69E+02

1.41E+02

2.50E-01

1.7

787

12.5x2.5

2.45E+03

2.43E+03

2.18E+03

3.06E+02

6.20E-01

4.3

1967

12.5x5

4.12E+03

4.07E+03

3.53E+03

4.96E+02

1.19E+00

8.7

3934

12.5x7.5

5.07E+03

4.99E+03

4.27E+03

6.19E+02

1.73E+00

13.0

5901

12.5x10

5.60E+03

5.51E+03

4.70E+03

7.03E+02

2.23E+00

17.4

7868

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Small Neodymium Disc Magnet Field Strengths & Holding Force

Small Neodymium Disc Magnet
Field Strengths & Holding Force