UMGZ 16x13x5 [M4] GZ / N38 - magnetic holder external thread

Pros as well as cons of NdFeB magnets.

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

• They have constant strength, and over more than ten years their performance decreases symbolically – ~1% (in testing),
• Neodymium magnets remain extremely resistant to magnetic field loss caused by external field sources,
• By applying a decorative layer of nickel, the element gains an modern look,
• Neodymium magnets achieve maximum magnetic induction on a small surface, which ensures high operational effectiveness,
• Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
• Due to the ability of flexible molding and customization to specialized needs, NdFeB magnets can be modeled in a wide range of geometric configurations, which makes them more universal,
• Key role in modern technologies – they are commonly used in mass storage devices, electromotive mechanisms, medical equipment, as well as other advanced devices.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages of neodymium magnets:

• They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
• Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
• Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
• Limited possibility of making threads in the magnet and complicated forms - preferred is cover - magnet mounting.
• Potential hazard related to microscopic parts of magnets can be dangerous, in case of ingestion, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small components of these devices are able to complicate diagnosis medical in case of swallowing.
• With budget limitations the cost of neodymium magnets is economically unviable,

Optimal lifting capacity of a neodymium magnet – what affects it?

Holding force of 5 kg is a measurement result conducted under standard conditions:

• on a plate made of mild steel, effectively closing the magnetic field
• with a cross-section minimum 10 mm
• with an ideally smooth touching surface
• without any clearance between the magnet and steel
• for force acting at a right angle (in the magnet axis)
• in stable room temperature

Lifting capacity in real conditions – factors

During everyday use, the actual holding force results from several key aspects, listed from the most important:

• Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
• Loading method – catalog parameter refers to detachment vertically. When applying parallel force, the magnet exhibits much less (often approx. 20-30% of maximum force).
• Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
• Material type – ideal substrate is pure iron steel. Hardened steels may have worse magnetic properties.
• Smoothness – full contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
• Thermal environment – temperature increase results in weakening of induction. It is worth remembering the thermal limit for a given model.

* Lifting capacity was determined using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular pulling force, however under parallel forces the lifting capacity is smaller. Additionally, even a minimal clearance {between} the magnet and the plate decreases the holding force.