Product Description
Neodymium Countersunk Hole Shallow Cap Magnet Ø25mm, Countersink Bore / Counterbore Disc Flat Pot Magnets, Rare Earth Neodymium Magnet in Steelpot with Countersunk Hole, Countersunk (Countersink) Ndfeb Pot Magnets, holding clamping mounting Magnets, Magnetic System w/ countersunk head screw, Plain Magnets China Supplier
Neodymium Countersunk Hole Shallow Cap Magnet Ø25mm Parameter:
Material: Neodymium (NdFeB ) and Steel
Part No.: JFM-NSA25 / CSA25
Plating / Coating: Nickel (Ni-Cu-Ni) or Zinc (Zn)
Shape: with Countersunk Borehole Mounting / with Countersunk hole / with Countersink borehole / Disc with Countersunk hole (90° sunken hole)
Pot Magnet Size:
| Voice | Name | Symbol | SI | CGS |
|---|---|---|---|---|
| Shape | Diameter | D | 25 mm | 2.5 cm |
| diameter | d | 19.5 mm | 1.95 cm | |
| Internal diameter | ID | 5.5 mm | 0.55 cm | |
| Supplementation | S | 10.5 mm | 1.05 cm | |
| Height | H | 8 mm | 0.8 cm | |
| height | h | 5.8 mm | 0.58 cm | |
| Thickness | T | 2 mm | 0.2 cm | |
| Screw | M | 5 mm | 0.5 cm | |
| direction of magnetization | M | A | ||
| Weight | Net | 0.02633 kg | 26.33 g | |
| Surface treatment | Ni | 12 μm | ||
| Magnetic Characteristics |
Surface magnetic flux density | B | mT | Gauss |
| Suction force Adhesion |
F | 22 kgf | 22000 gf | |
| Magnetic flux density on load point | Bd | mT | Gauss | |
| Total flux | φo | Wb | Mx | |
| Permeance Coefficient | Pc | Pc | ||
| Maximum usage temperature | Tw | 80 ℃ | ||
| Minimum usage temperature | Tw | ℃ | ||
| Material properties | Materialsymbols | Pot Cap Neodymium | 35 | |
| remanence | Br | 1170-1220 mT | 11.7-12.2 kG | |
| Coercivity | Hcb | ≧868 kA/m | kOe | |
| Intrinsic coercive force | Hcj | ≧955 kA/m | kOe | |
| Maximum energy product | BH | 263-287 kj/m3 | MGOe | |
| Temperature coefficient | Br | -0.12 %/℃ | ||
| Hcj | -0.55 %/℃ | |||
| Heat resistant temperature | Tw | ≦80 ℃ | ||
| Curie temperature | Tc | 310 ℃ | ||
| Density | ρ | 7.5 kg/m3 | ||
| Remarks | REACH RoHS Directive | |||
What does a neodymium pot magnet consist of?
These super-strong pot magnets are made of the alloy neodymium-iron-boron – (NdFeB). The shell – or pot – provides magnetic shielding. Goudsmit supplies neodymium pot magnets with a brass or steel shell. The holding surface is covered with a protective coating to prevent corrosion. Neodymium Shallow Countersunk Hole Cup Magnet, Ø32mm Countersunk Shallow Pot Neodymium Magnets
When does loss of magnetic strength occur?
Neodymium pot magnets have a maximum operating temperature of up to 80 °C. When heated to this temperature, the magnet loses 15 to 20% of its magnetic force. This is not permanent; the force is restored when the magnet returns to the normal ambient temperature.
External magnetic fields may also cause loss of magnetic force. An air gap or non-magnetic materials located between the magnet and workpiece reduce the tensile force.
