UMGZ 20x15x7 [M4] GZ / N38 - magnetic holder external thread

Strengths as well as weaknesses of rare earth magnets.

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

• Their power remains stable, and after approximately 10 years it drops only by ~1% (according to research),
• They do not lose their magnetic properties even under close interference source,
• In other words, due to the shiny surface of gold, the element gains a professional look,
• The surface of neodymium magnets generates a powerful magnetic field – this is one of their assets,
• Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
• Possibility of custom creating and optimizing to defined conditions,
• Wide application in modern technologies – they are utilized in magnetic memories, electric motors, advanced medical instruments, as well as other advanced devices.
• Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which enables their usage in small systems

Disadvantages of neodymium magnets:

• At very strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
• Neodymium magnets lose force 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 extremely resistant to heat
• They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
• We recommend cover - magnetic mechanism, due to difficulties in realizing threads inside the magnet and complicated forms.
• Potential hazard to health – tiny shards of magnets are risky, in case of ingestion, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small elements of these magnets can be problematic in diagnostics medical after entering the body.
• Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Magnetic strength at its maximum – what affects it?

The lifting capacity listed is a result of laboratory testing performed under specific, ideal conditions:

• using a base made of low-carbon steel, serving as a ideal flux conductor
• whose transverse dimension is min. 10 mm
• with an ground touching surface
• without the slightest insulating layer between the magnet and steel
• during pulling in a direction vertical to the mounting surface
• at temperature room level

Practical aspects of lifting capacity – factors

Bear in mind that the application force will differ subject to elements below, in order of importance:

• Air gap (between the magnet and the plate), as even a microscopic clearance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to paint, rust or dirt).
• Angle of force application – maximum parameter is reached only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is standardly many times smaller (approx. 1/5 of the lifting capacity).
• Substrate thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
• Material type – the best choice is high-permeability steel. Stainless steels may have worse magnetic properties.
• Surface quality – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
• Temperature – heating the magnet results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

* Lifting capacity testing was performed on a smooth plate of suitable thickness, under a perpendicular pulling force, whereas under parallel forces the holding force is lower. In addition, even a minimal clearance {between} the magnet and the plate lowers the holding force.