The 12.5x12.5mm sintered neodyrium rare earth rod magnet has over 14 lbs pull force, sufficient for flywheel applications. Want to demonstrate eddy current braking? Drop this magnet down a 1/2" diameter copper or aluminum pipe & be amazed.
The Mark II Magnaprobe is an excellent tool for detecting magnetic fields & is must for any college or high school electricity & magnetism lab. See it in action below in our eddy current-drop tower braking simulation or read our blog Eddy Current Copper Tube Drop Tower Brake Test.
Even more impressive is the ultrasensitive Mark I Magnaprobe which responds to magnetic fields as weak as 0.3 gauss. A must if your cyclotron or particle collider is slightly off. In this instance, it was able to detect the eddy current in the simulation below at a distance of over 1m (3.3 feet)!
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Tracy Myerson: Super fast shipping, excellent prices, and great quality product! I purchased N42 Neodymium magnets, they are the real deal. I had previously bought magnets on Amazon that were advertised as N52, they were just another cheap Chinese fake. These folks sell authentic, high quality....
Ian Kelly: I've dealt with Indigo Instruments for years now. They have always been personable and very knowledgeable. Most recently I sent them a hand-drawn sketch of my interpretation of something I saw on YouTube and wanted recommendations....I couldn't be happier...
| Field Strength (Gauss) & Pull Force in Pounds & Kilograms at 5 Distances Above Magnet | |||||
| SKU: 44204-12.5 Size: 12.5 × 12.5mm | |||||
| Distance (mm): | 0 | 0.1 | 1 | 10 | 100 |
|---|---|---|---|---|---|
| Gauss | 5903.2 | 5807.0 | 4946.5 | 762.4 | 2.7 |
| Lb | 14.14 | 13.68 | 9.93 | 0.24 | 0.00 |
| Kg | 6.43 | 6.22 | 4.51 | 0.11 | 0.00 |
Magnet Documentation |
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|---|---|---|---|---|---|
| Drawing | Compliance | MSDS | ROHS | Graph | |
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| RemanentFlux Density (Br) | 13,000G; 1300mT |
| Coercivity (bHc) | 12.0 Oe; 955 A/m |
| Intrinsic Coercivity (jHc) | 17.0 Oe; 1353 A/m |
| Max.Energy Product (BHMax) | 42 MGO; 334 kJ/m3 |
| Curie Temperature (Tc) | 310oC |
| Working Temperature (Tw) | 80oC |
| Temp.Coefficient (αB)r | -0.12%/Co |
| Dimensions | Tolerances | |||
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Size: |
Inches | mm | Inches | mm |
|---|---|---|---|---|
| 0 to 0.125 | 0 to 3 | +/- 0.006 | +/- 0.15 | |
| 0.126 to 0.625 | 3 to 16 | +/- 0.012 | +/- 0.30 | |
| 0.626 to 0.875 | 16 to 22 | +/- 0.018 | +/- 0.45 | |
| 0.876 and Up | 22 and Up | +/- 2.5% | +/- 2.5% | |
| Inch | Decimal | mm | Rounded |
|---|---|---|---|
| 1/32" | 0.031 | 0.8 | 1 |
| 3/32" | 0.094 | 2.4 | 2.5 |
| 5/32" | 0.156 | 4.0 | 4 |
| 1/16" | 0.063 | 1.6 | 1.5 |
| 3/16" | 0.188 | 4.8 | 5 |
| 2/10" | 0.200 | 5.1 | 5 |
| 1/8" | 0.125 | 3.2 | 3.75 |
| 1/4" | 0.250 | 6.4 | 7.5 |
| 5/16" | 0.313 | 7.9 | 7.5 |
| 3/8" | 0.375 | 9.5 | 10 |
| 13/32" | 0.406 | 10.3 | 10 |
| 1/2" | 0.500 | 12.7 | 12.5 |
| 9/16" | 0.563 | 14.3 | 15 |
| 5/8" | 0.625 | 15.9 | 15 |
| 11/16" | 0.688 | 17.5 | 17.5 |
| 3/4" | 0.750 | 19.1 | 20 |
| 13/16" | 0.813 | 20.6 | 20 |
| 7/8" | 0.875 | 22.2 | 22.5 |
| 15/16" | 0.938 | 23.8 | 25 |
Always good quality, fast shipment with good communications. Product is dimensionally accurate (which is important to me) and the plating doesn't chip off very easily as long as you handle these strong magnets with care.
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