Large Magnetic Disc Specifications: Field Strength, Holding Force

Large Nd Disc Magnets
Field Strengths & Holding Force

The disc 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

15x2.5

2.09E+03

2.07E+03

1.92E+03

3.79E+02

8.90E-01

5.2

2360

15x5

3.66E+03

3.62E+03

3.25E+03

6.23E+02

1.71E+00

10.4

4721

15x7.5

4.67E+03

4.61E+03

4.08E+03

7.86E+02

2.48E+00

15.6

7081

15x10

5.28E+03

5.21E+03

4.58E+03

9.00E+02

3.20E+00

20.8

9441

15x12.5

5.66E+03

5.58E+03

4.90E+03

9.81E+02

3.87E+00

26.0

11802

116

20x2.5

1.60E+03

1.59E+03

1.52E+03

4.87E+02

1.57E+00

6.9

3147

20x5

2.95E+03

2.93E+03

2.74E+03

8.25E+02

3.02E+00

13.9

6294

25x2.5

1.29E+03

1.25E+03

5.44E+02

2.43E+00

8.7

3934

25x5

2.45E+03

2.44E+03

2.33E+03

9.47E+02

4.69E+00

17.4

7868

25x10

4.12E+03

4.10E+03

3.83E+03

1.47E+03

8.76E+00

34.7

15735

154

25x12.5

4.67E+03

4.63E+03

4.32E+03

1.65E+03

1.06E+01

43.4

19669

193

25x20

5.60E+03

5.55E+03

5.15E+03

1.97E+03

1.55E+01

69.4

31471

309

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Large Nd Disc Magnets Field Strengths & Holding Force

Large Nd Disc Magnets
Field Strengths & Holding Force