UMGZ 75x34x18 [M10] GZ / N38 - magnetic holder external thread

Advantages and disadvantages of neodymium magnets.

Apart from their consistent holding force, neodymium magnets have these key benefits:

• They retain full power for nearly 10 years – the drop is just ~1% (according to analyses),
• Magnets very well protect themselves against demagnetization caused by foreign field sources,
• In other words, due to the reflective layer of nickel, the element becomes visually attractive,
• They feature high magnetic induction at the operating surface, which increases their power,
• Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
• Due to the option of flexible shaping and adaptation to individualized requirements, neodymium magnets can be modeled in a variety of forms and dimensions, which amplifies use scope,
• Wide application in advanced technology sectors – they serve a role in hard drives, electric motors, advanced medical instruments, as well as industrial machines.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages of NdFeB magnets:

• To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
• Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as 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
• They oxidize in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
• We recommend casing - magnetic mount, due to difficulties in producing threads inside the magnet and complex forms.
• Health risk to health – tiny shards of magnets are risky, in case of ingestion, which gains importance in the context of child safety. Furthermore, small elements of these devices can complicate diagnosis medical after entering the body.
• With large orders the cost of neodymium magnets can be a barrier,

Maximum holding power of the magnet – what it depends on?

The declared magnet strength refers to the maximum value, obtained under optimal environment, specifically:

• with the use of a yoke made of special test steel, guaranteeing full magnetic saturation
• with a cross-section minimum 10 mm
• with a surface perfectly flat
• without the slightest insulating layer between the magnet and steel
• for force applied at a right angle (pull-off, not shear)
• at ambient temperature approx. 20 degrees Celsius

Practical aspects of lifting capacity – factors

It is worth knowing that the working load may be lower depending on elements below, starting with the most relevant:

• Distance – the presence of foreign body (paint, dirt, gap) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
• Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
• Base massiveness – too thin steel does not close the flux, causing part of the flux to be escaped to the other side.
• Steel type – low-carbon steel attracts best. Higher carbon content lower magnetic properties and lifting capacity.
• Plate texture – smooth surfaces guarantee perfect abutment, which improves field saturation. Uneven metal reduce efficiency.
• Thermal factor – hot environment reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

* Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the load capacity is reduced by as much as 75%. Moreover, even a small distance {between} the magnet’s surface and the plate decreases the load capacity.