Pot magnets with countersunk hole
Pot magnets with screw hole - also called countersunk magnets - are compact magnet systems with a steel shell and a countersunk hole for easy mounting. The bolt with a flat countersunk head falls flush with or in the top of the magnet. This optimizes the attracting surface of the pot magnet.
Thanks to the shell of these magnet systems, the magnetic field strength increases and the pot magnets are more resistant to corrosion or chemicals. Pot magnets have a single attracting surface. This precludes dispersion of the magnetic field. Pot magnets with countersunk hole are available in various sizes and types such as neodymium, ferrite and AlNiCo.
- Available in various sizes
- Deliverable from stock
- Easy to install
- Available in various qualities
- Buy magnets online
What does a neodymium pot magnet consist of?
These super-strong pot magnets are made of the alloy neodymium-iron-boron - (NdFeB) - which Goudsmit markets under the brand name Neoflux®. 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.
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.
Tension on the magnet
For pot magnets with a cylinder hole, the magnet has a countersunk hole. Tighten with caution. Excessive tightening causes magnetic splinters or cracks in the magnet.
Good magnetic properties, affordably priced
Ferrite pot magnets, also referred to as ceramic pot magnets, are fitted with a steel pot that provides shielding of the magnetic field. Ferrite pot magnets require only a minimal installation height. This provides constructive advantages.
When does loss of magnetic strength occur?
Ferrite pot magnets have an operating temperature of up to 200 °C. When heated to this temperature, the magnet loses 30 to 40% of its magnetic force. This is not permanent; the force is restored when the magnet returns to the normal ambient temperature. The magnetic force of these pot magnets is lower than that of neodymium pot magnets.
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.
Corrosion-resistant
Ferrite pot magnets do not corrode and are very suitable for outdoor use. With this type of pot magnet, the magnet has a countersunk hole. Tighten with caution. Excessive tightening causes magnetic splinters or cracks in the magnet.
What does an AlNiCo pot magnet consist of?
AlNiCo pot magnets are made of an alloy of aluminium, nickel and cobalt. They are encased in a steel pot, with a non-magnetizable material - brass or aluminium - in between. AlNiCo pot magnets have a very high operating temperature.
When does loss of magnetic strength occur?
AlNico pot magnets have a very high operating temperature of up to 450 °C. When heated to this temperature, the magnet loses 30 to 40% of its magnetic force. This is not permanent; the force is restored when the pot magnet cools down to 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.
Corrosion-resistant
AlNico pot magnets do not corrode and are very suitable for use at high temperatures. With this type of pot magnet, the magnet has a countersunk hole. Tighten with caution. Excessive tightening causes magnetic splinters or cracks in the magnet.