Small Nd Disc Magnet
Field Strengths & Holding Force

The disk 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

Metric measurement explained:
25mm (2.5cm) = ~1 inch; 2.5mm (0.25cm) = ~ 1/10 inch;

Scientific notation explained:
1.15E+03=1150; 1.15E+02=115; 1.15E+01=11.5; 1.15E+00=1.15; 1.15E-01=0.12; 1.15E-02=0.01

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

Small Nd Disc Magnets

All Rare Earth Magnets

Home

rare earth magnets, molecular models, credit card magnifiers, school science supplies

Email:
Distribution & Mail 169 Lexington Court, Unit I Waterloo, ON, N2J 4R9	Distribution Only Niagara Falls, NY 14305 See: Returns Policy
Phone: (519) 746-4761 Fax: (519) 747-5636 Or ORDER toll-free at: 1 (877) 746-4764
Waterloo Region Customers: No walk-in store-order on-line, then call to arrange pickup. Choose pickup as "freight" option; $5.00 minimum.

Small Nd Disc Magnet Field Strengths & Holding Force

Small Nd Disc Magnet
Field Strengths & Holding Force