UMGGZ 22x6 [M4] GZ / N38 - rubber magnetic holder external thread

Advantages and disadvantages of rare earth magnets.

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:

• They do not lose power, even after nearly 10 years – the drop in power is only ~1% (based on measurements),
• Magnets perfectly defend themselves against demagnetization caused by ambient magnetic noise,
• A magnet with a metallic gold surface looks better,
• Magnetic induction on the top side of the magnet turns out to be strong,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
• Considering the possibility of precise forming and customization to custom needs, neodymium magnets can be manufactured in a variety of forms and dimensions, which makes them more universal,
• Fundamental importance in modern technologies – they are commonly used in hard drives, brushless drives, medical devices, also multitasking production systems.
• Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which makes them useful in small systems

Cons of neodymium magnets and ways of using them

• At very strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
• Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
• Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
• We suggest a housing - magnetic holder, due to difficulties in creating nuts inside the magnet and complex shapes.
• Potential hazard resulting from small fragments of magnets pose a threat, in case of ingestion, which gains importance in the context of child health protection. It is also worth noting that small components of these magnets are able to disrupt the diagnostic process medical after entering the body.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Maximum lifting force for a neodymium magnet – what it depends on?

Magnet power was defined for the most favorable conditions, taking into account:

• with the use of a yoke made of special test steel, guaranteeing full magnetic saturation
• whose thickness equals approx. 10 mm
• with a plane perfectly flat
• without any clearance between the magnet and steel
• during detachment in a direction vertical to the plane
• at temperature room level

Determinants of practical lifting force of a magnet

In real-world applications, the actual holding force results from many variables, ranked from the most important:

• Distance (between the magnet and the metal), as even a tiny distance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to paint, rust or dirt).
• Force direction – catalog parameter refers to detachment vertically. When attempting to slide, the magnet holds much less (often approx. 20-30% of nominal force).
• Base massiveness – too thin sheet does not accept the full field, causing part of the power to be escaped into the air.
• Material type – the best choice is high-permeability steel. Stainless steels may attract less.
• Plate texture – smooth surfaces guarantee perfect abutment, which increases field saturation. Rough surfaces reduce efficiency.
• Operating temperature – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures gain strength (up to a certain limit).

* Lifting capacity testing was conducted on a smooth plate of suitable thickness, under perpendicular forces, however under parallel forces the holding force is lower. Additionally, even a small distance {between} the magnet and the plate lowers the lifting capacity.