UMGZ 42x20x9 [M8] GZ / N38 - magnetic holder external thread

Pros and cons of neodymium magnets.

Besides their immense strength, neodymium magnets offer the following advantages:

• They do not lose magnetism, even after approximately ten years – the reduction in power is only ~1% (theoretically),
• They have excellent resistance to magnetic field loss due to opposing magnetic fields,
• A magnet with a shiny nickel surface has better aesthetics,
• Magnets possess extremely high magnetic induction on the surface,
• Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
• Considering the possibility of flexible forming and customization to custom solutions, NdFeB magnets can be modeled in a variety of forms and dimensions, which increases their versatility,
• Wide application in advanced technology sectors – they serve a role in mass storage devices, brushless drives, precision medical tools, as well as complex engineering applications.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

What to avoid - cons of neodymium magnets: weaknesses and usage proposals

• Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a special holder, which not only secures them against impacts but also increases their durability
• When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
• Due to limitations in creating threads and complicated shapes in magnets, we propose using casing - magnetic holder.
• Potential hazard to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child health protection. It is also worth noting that tiny parts of these products are able to complicate diagnosis medical when they are in the body.
• With mass production the cost of neodymium magnets is a challenge,

Breakaway strength of the magnet in ideal conditions – what affects it?

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

• on a block made of mild steel, effectively closing the magnetic flux
• with a cross-section minimum 10 mm
• characterized by smoothness
• under conditions of gap-free contact (surface-to-surface)
• during pulling in a direction vertical to the plane
• in stable room temperature

Lifting capacity in real conditions – factors

In real-world applications, the actual holding force depends on several key aspects, ranked from the most important:

• Space between surfaces – every millimeter of separation (caused e.g. by varnish or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
• Loading method – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet exhibits much less (often approx. 20-30% of maximum force).
• Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
• Plate material – low-carbon steel attracts best. Alloy steels lower magnetic permeability and lifting capacity.
• Smoothness – ideal contact is possible only on polished steel. Rough texture create air cushions, weakening the magnet.
• Thermal environment – temperature increase results in weakening of induction. Check the maximum operating temperature for a given model.

* Lifting capacity was determined by applying a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, whereas under parallel forces the load capacity is reduced by as much as fivefold. Moreover, even a minimal clearance {between} the magnet’s surface and the plate reduces the holding force.