UMGGZ 43x6 [M6] GZ / N38 - rubber magnetic holder external thread

Advantages as well as disadvantages of neodymium magnets.

Besides their stability, neodymium magnets are valued for these benefits:

• They retain attractive force for nearly ten years – the loss is just ~1% (based on simulations),
• They possess excellent resistance to weakening of magnetic properties due to external fields,
• The use of an metallic layer of noble metals (nickel, gold, silver) causes the element to present itself better,
• They feature high magnetic induction at the operating surface, which affects their effectiveness,
• Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
• Possibility of individual creating as well as adjusting to defined needs,
• Huge importance in modern technologies – they are used in mass storage devices, brushless drives, advanced medical instruments, and multitasking production systems.
• Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Disadvantages of neodymium magnets:

• They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
• Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
• Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
• Limited ability of producing nuts in the magnet and complex shapes - recommended is a housing - mounting mechanism.
• Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that tiny parts of these products can disrupt the diagnostic process medical when they are in the body.
• Due to expensive raw materials, their price exceeds standard values,

Optimal lifting capacity of a neodymium magnet – what affects it?

The declared magnet strength refers to the limit force, recorded under optimal environment, meaning:

• using a sheet made of low-carbon steel, serving as a ideal flux conductor
• whose transverse dimension is min. 10 mm
• characterized by smoothness
• under conditions of no distance (surface-to-surface)
• during pulling in a direction vertical to the mounting surface
• in stable room temperature

Lifting capacity in practice – influencing factors

Please note that the working load may be lower subject to the following factors, starting with the most relevant:

• Air gap (betwixt the magnet and the metal), because even a microscopic clearance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to paint, rust or debris).
• Load vector – maximum parameter is available only during pulling at a 90° angle. The force required to slide of the magnet along the plate is usually many times lower (approx. 1/5 of the lifting capacity).
• Steel thickness – too thin steel does not close the flux, causing part of the flux to be escaped to the other side.
• Material composition – different alloys reacts the same. Alloy additives worsen the interaction with the magnet.
• Surface finish – full contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
• Temperature influence – hot environment reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

* Lifting capacity was assessed using a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, in contrast under parallel forces the holding force is lower. In addition, even a minimal clearance {between} the magnet’s surface and the plate decreases the holding force.