 Organic Chemistry Molecular Model Sets, Permanent Neodymium Rare Earth Magnets, Magnifying Glasses, Test Strips, Lab Supplies, Tuning Forks
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Large Neodymium Disc Magnets
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| The large 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 the maximum theoretical
value which 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.
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| Field Strengths (in gauss) at 5 Distances (in mm); Holding Force in 3 Units | ||||||||
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| Size (mm) | 0 | 0.1 | 1 | 10 | 100 | lbs | gms | N |
| 15x1 | 8.72E+02 | 8.69E+02 | 8.28E+02 | 1.73E+02 | 3.60E-01 | 2.1 | 945 | 9 |
| 15x2.5 | 2.09E+03 | 2.07E+03 | 1.92E+03 | 3.79E+02 | 8.90E-01 | 5.2 | 2360 | 23 |
| 15x5 | 3.66E+03 | 3.62E+03 | 3.25E+03 | 6.23E+02 | 1.71E+00 | 10.4 | 4721 | 46 |
| 15x7.5 | 4.67E+03 | 4.61E+03 | 4.08E+03 | 7.86E+02 | 2.48E+00 | 15.6 | 7081 | 69 |
| 15x10 | 5.28E+03 | 5.21E+03 | 4.58E+03 | 9.00E+02 | 3.20E+00 | 20.8 | 9441 | 93 |
| 15x12.5 | 5.66E+03 | 5.58E+03 | 4.90E+03 | 9.81E+02 | 3.87E+00 | 26.0 | 11802 | 116 |
| 17.5x1 | 7.49E+02 | 7.47E+02 | 7.21E+02 | 1.98E+02 | 4.90E-01 | 2.4 | 1101 | 11 |
| 20x2.5 | 1.60E+03 | 1.59E+03 | 1.52E+03 | 4.87E+02 | 1.57E+00 | 6.9 | 3147 | 31 |
| 20x5 | 2.95E+03 | 2.93E+03 | 2.74E+03 | 8.25E+02 | 3.02E+00 | 13.9 | 6294 | 62 |
| 25x2.5 | 1.29E+03 | 1.29E+03 | 1.25E+03 | 5.44E+02 | 2.43E+00 | 8.7 | 3934 | 39 |
| 25x5 | 2.45E+03 | 2.44E+03 | 2.33E+03 | 9.47E+02 | 4.69E+00 | 17.4 | 7868 | 77 |
| 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 |
All Rare Earth Magnets Organic Chemistry Molecular Model Sets, Permanent Neodymium Rare Earth Magnets, Magnifying Glasses, Test Strips, Lab Supplies, Tuning Forks
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