UMGGZ 34x6 [M4] GZ / N38 - rubber magnetic holder external thread

Strengths as well as weaknesses of NdFeB magnets.

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

• Their power is durable, and after around 10 years it drops only by ~1% (theoretically),
• Magnets effectively protect themselves against demagnetization caused by ambient magnetic noise,
• In other words, due to the metallic surface of silver, the element gains visual value,
• Magnetic induction on the working layer of the magnet is exceptional,
• Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
• Possibility of accurate machining and adjusting to defined requirements,
• Versatile presence in advanced technology sectors – they are utilized in mass storage devices, motor assemblies, medical devices, and industrial machines.
• Thanks to their power density, small magnets offer high operating force, with minimal size,

Cons of neodymium magnets: application proposals

• They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
• NdFeB magnets lose power 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
• Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
• Limited ability of producing nuts in the magnet and complex forms - preferred is a housing - mounting mechanism.
• Possible danger to health – tiny shards of magnets are risky, if swallowed, which gains importance in the context of child health protection. Furthermore, small components of these devices are able to disrupt the diagnostic process medical when they are in the body.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Maximum lifting capacity of the magnet – what affects it?

The force parameter is a measurement result conducted under standard conditions:

• on a plate made of mild steel, perfectly concentrating the magnetic field
• possessing a massiveness of minimum 10 mm to ensure full flux closure
• characterized by lack of roughness
• with total lack of distance (without coatings)
• under perpendicular force direction (90-degree angle)
• at room temperature

Key elements affecting lifting force

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

• Distance (betwixt the magnet and the plate), since even a very small clearance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to paint, rust or debris).
• Load vector – highest force is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
• Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
• Chemical composition of the base – mild steel gives the best results. Alloy steels decrease magnetic properties and lifting capacity.
• Surface structure – the more even the surface, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
• Thermal environment – temperature increase causes a temporary drop of induction. Check the thermal limit for a given model.

* Lifting capacity testing was conducted on a smooth plate of optimal thickness, under a perpendicular pulling force, in contrast under parallel forces the load capacity is reduced by as much as 75%. In addition, even a minimal clearance {between} the magnet’s surface and the plate lowers the lifting capacity.