UMGGZ 34x6 [M4] GZ / N38 - rubber magnetic holder external thread

Strengths and weaknesses of neodymium magnets.

In addition to their pulling strength, neodymium magnets provide the following advantages:

• Their magnetic field is maintained, and after approximately 10 years it decreases only by ~1% (according to research),
• They retain their magnetic properties even under close interference source,
• In other words, due to the metallic finish of gold, the element becomes visually attractive,
• They feature high magnetic induction at the operating surface, which improves attraction properties,
• 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...
• Possibility of individual forming and optimizing to concrete applications,
• Huge importance in innovative solutions – they are commonly used in mass storage devices, electromotive mechanisms, medical equipment, also modern systems.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Drawbacks and weaknesses of neodymium magnets and proposals for their use:

• To avoid cracks under impact, we suggest using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
• NdFeB magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (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 very resistant to heat
• Magnets exposed to a humid environment can rust. Therefore during using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
• We recommend cover - magnetic holder, due to difficulties in producing threads inside the magnet and complicated shapes.
• Potential hazard related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child safety. It is also worth noting that small elements of these products can disrupt the diagnostic process medical when they are in the body.
• High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Maximum holding power of the magnet – what it depends on?

Breakaway force was determined for the most favorable conditions, including:

• on a base made of mild steel, effectively closing the magnetic field
• with a cross-section of at least 10 mm
• with a plane perfectly flat
• without the slightest air gap between the magnet and steel
• during pulling in a direction perpendicular to the plane
• at room temperature

Lifting capacity in real conditions – factors

In practice, the real power results from several key aspects, listed from the most important:

• Gap between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
• Angle of force application – highest force is available only during pulling at a 90° angle. The force required to slide of the magnet along the surface is typically many times lower (approx. 1/5 of the lifting capacity).
• Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
• Plate material – low-carbon steel attracts best. Higher carbon content decrease magnetic properties and holding force.
• Surface condition – ground elements ensure maximum contact, which improves force. Uneven metal weaken the grip.
• Temperature – temperature increase results in weakening of force. Check the thermal limit for a given model.

* Lifting capacity was determined using a polished steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, however under attempts to slide the magnet the holding force is lower. In addition, even a minimal clearance {between} the magnet’s surface and the plate lowers the load capacity.