Rectangle Magnet Force Energy and Field Strength

Nd Rectangle Magnets
Field Strengths & Holding Force

The rectangular 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

4x2x1

3.72E+03

3.48E+03

1.53E+03

1.40E+01

2.00E-02

0.4

199

5x2.5x1

3.19E+03

3.04E+03

1.62E+03

2.13E+01

3.00E-02

0.6

251

10x2.5x2.5

4.87E+03

4.60E+03

2.49E+03

7.79E+01

1.30E-01

2.0

886

10x5x2.5

3.72E+03

3.63E+03

2.72E+03

1.50E+02

2.50E-01

2.8

1256

12.5x2.5x2.5

4.80E+03

4.53E+03

2.45E+03

8.94E+01

1.60E-01

2.2

991

12.5x5x2.5

3.59E+03

3.50E+03

2.64E+03

1.73E+02

3.10E-01

3.1

1405

12.5x5x5

5.10E+03

4.96E+03

3.69E+03

2.76E+02

6.10E-01

6.2

2809

25x2.5x2.5

4.69E+03

4.42E+03

2.36E+03

1.12E+02

3.10E-01

3.1

1403

25x5x2.5

3.38E+03

3.29E+03

2.47E+03

2.16E+02

6.20E-01

4.4

1985

25x5x5

4.80E+03

4.66E+03

3.48E+03

3.58E+02

1.20E+00

8.8

3971

25x10x2.5

2.11E+03

2.09E+03

1.89E+03

3.82E+02

1.24E+00

6.2

2807

25x10x5

3.59E+03

3.55E+03

3.12E+03

6.42E+02

2.40E+00

12.4

5615

25x12.5x2.5

1.79E+03

1.78E+03

1.66E+03

4.41E+02

1.55E+00

6.9

3141

50x5x2.5

3.32E+03

3.24E+03

2.42E+03

2.14E+02

1.19E+00

6.2

2807

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Nd Rectangle Magnets Field Strengths & Holding Force

Nd Rectangle Magnets
Field Strengths & Holding Force