Rare earth neodymium magnets
Shape: Disc/Round
Size: D3x3 mm (diameter x thickness)
Default tolerance: +/-0.1mm Or customize as required
Material: NdFeB (sintered neodymium-iron-boron)
Grade: N42
Coating: Zn (Zinc coating has a good shield to against salt spray.)
Direction of Magnetisation: Axially (through height)
Multi-purpose: In office, basement, Garage, warehouse can be used for tool storage, bag sealing, craft projects, cabinet doors. In home use for refrigerator magnets, storage magnets, kitchen storage, jar storage, Fridge magnets etc.
| Characteristic | Symbol | Unit | Value |
| Density | D | g/cm | 7.45-7.65 |
| Vickers Hardness | Hv | D.P.N | 620 |
| Compression Strength | C.S | N/mm2 | 780 |
| Coefcient of Thermal Expansion | C// | 10-6/°C | 3.4 |
| CŁ | 10-6/°C | -4.8 | |
| Electrical Resistivity | ƿ | µ Ω.cm | 1.8x10 x^(-4) |
| Temperature coefcient of resistivity | α | 10x^(-4)/°C | 2 |
| Electrical Conductivity | σ | kCal/(m.h.°C) | 0.667 |
| Thermal Conductivity | k | kCal/(kg.°C) | 8.9551 |
| Specifc Heat Capacity | c | kg/mm2 | 0.12 |
| Tensile Strength | σUTS, or SU | Mpa | 80 |
| Young's Modulus | λ / E | 10-12m2/N | 0.16x1011 |
| Flexural Strength | β | 10-12m2/N | 9.8 |
| Compressibility | σ | 10-12m2/N | 9.8 |
| Rigidity | E.I | N/m2 | 0.64 |
| Poisson's Ratio | ν | 0.24 | |
| Curie Temperature | Tc | °C | 310-380 |
NdFeB magnets are sintered anisotropic materials - they have a preferred direction of magnetisation locked into their structure.
Neodymium magnets come in many shapes and sizes, and different shapes have corresponding magnetization directions.
Disk, cylindrical and ring magnets can be magnetized Axially or Radially. Axially magnetized disc magnets have north and south pole s on a large flat surface. Radially magnetized disc magnets have north and south poles on the sides of the circle.
In order to let the customer distinguish the N-S pole easily, we can offer North / South Pole marked, this is a simply marking on the North / South pole of the magnet - does not affect tolerance. The marking of polarity is not the default service, we will not apply this to our production unless the customers make their own requests.
