UMGZ 60x30x15 [M10] GZ / N38 - magnetic holder external thread

Strengths as well as weaknesses of neodymium magnets.

Besides their immense field intensity, neodymium magnets offer the following advantages:

• Their magnetic field is durable, and after around 10 years it decreases only by ~1% (theoretically),
• They retain their magnetic properties even under close interference source,
• The use of an elegant layer of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
• They show high magnetic induction at the operating surface, which affects their effectiveness,
• Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling action at temperatures approaching 230°C and above...
• Thanks to the potential of flexible molding and customization to unique requirements, NdFeB magnets can be manufactured in a wide range of forms and dimensions, which makes them more universal,
• Significant place in future technologies – they serve a role in magnetic memories, brushless drives, precision medical tools, also industrial machines.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages of neodymium magnets:

• At strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
• NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (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 extremely resistant to heat
• When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
• Limited ability of producing nuts in the magnet and complicated shapes - preferred is cover - mounting mechanism.
• Potential hazard to health – tiny shards of magnets are risky, if swallowed, which gains importance in the context of child safety. Furthermore, tiny parts of these products are able to be problematic in diagnostics medical when they are in the body.
• Due to expensive raw materials, their price is relatively high,

Magnetic strength at its maximum – what affects it?

Magnet power was defined for optimal configuration, taking into account:

• using a sheet made of low-carbon steel, functioning as a ideal flux conductor
• whose thickness reaches at least 10 mm
• with a plane cleaned and smooth
• under conditions of gap-free contact (metal-to-metal)
• under vertical force vector (90-degree angle)
• at standard ambient temperature

Magnet lifting force in use – key factors

Bear in mind that the working load may be lower subject to elements below, in order of importance:

• Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
• Loading method – declared lifting capacity refers to pulling vertically. When slipping, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
• Substrate thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
• Metal type – different alloys attracts identically. High carbon content weaken the interaction with the magnet.
• Smoothness – ideal contact is obtained only on smooth steel. Rough texture reduce the real contact area, reducing force.
• Heat – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures they can be stronger (up to a certain limit).

* Lifting capacity testing was carried out on a smooth plate of optimal thickness, under perpendicular forces, whereas under parallel forces the load capacity is reduced by as much as 5 times. Moreover, even a minimal clearance {between} the magnet and the plate reduces the lifting capacity.