Magnetic Disk Field Strengths and Holding Forces

Small Nd Disk Magnet
Field Strengths & Holding Force

The disk magnets are N42 ~13,000 gauss (1.3T-N42 grade) which is a theoretical maximum value. 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 holding forces are also theoretical maximums dependent on the permeability, thickness and area of the metal used. The attractive/repulsive force of 2 identical magnets is double this value.

nickel coated
size tolerance is +/- 0.1mm
80C maximum operating temperature

~25mm (2.5cm) = ~1 inch; 2.5mm (0.25cm) = ~ 1/10 inch; 3E=x 1000.

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

Size

0.1

100

lbF

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

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

12.5x2.5

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 Nd Disk Magnet Field Strengths & Holding Force

Small Nd Disk Magnet
Field Strengths & Holding Force