UMH 42x9x46 [M6] / N38 - magnetic holder with hook

Pros and cons of neodymium magnets.

Besides their stability, neodymium magnets are valued for these benefits:

• They virtually do not lose strength, because even after ten years the performance loss is only ~1% (in laboratory conditions),
• Neodymium magnets prove to be highly resistant to loss of magnetic properties caused by external magnetic fields,
• In other words, due to the aesthetic finish of silver, the element looks attractive,
• Neodymium magnets ensure maximum magnetic induction on a small surface, which ensures high operational effectiveness,
• Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for action at temperatures approaching 230°C and above...
• Thanks to freedom in shaping and the capacity to adapt to client solutions,
• Key role in future technologies – they are commonly used in mass storage devices, electric motors, precision medical tools, also modern systems.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages of neodymium magnets:

• They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
• We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
• They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
• Due to limitations in realizing threads and complicated forms in magnets, we recommend using cover - magnetic mount.
• Possible danger resulting from small fragments of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child safety. Furthermore, small elements of these products are able to be problematic in diagnostics medical in case of swallowing.
• Due to complex production process, their price exceeds standard values,

Maximum holding power of the magnet – what contributes to it?

Breakaway force is the result of a measurement for optimal configuration, assuming:

• with the use of a yoke made of low-carbon steel, ensuring maximum field concentration
• with a cross-section minimum 10 mm
• with a plane cleaned and smooth
• under conditions of no distance (metal-to-metal)
• during pulling in a direction perpendicular to the mounting surface
• at temperature approx. 20 degrees Celsius

Determinants of lifting force in real conditions

Please note that the application force may be lower depending on the following factors, starting with the most relevant:

• Distance (betwixt the magnet and the metal), because even a microscopic clearance (e.g. 0.5 mm) leads to a decrease in force by up to 50% (this also applies to varnish, corrosion or dirt).
• Loading method – catalog parameter refers to detachment vertically. When attempting to slide, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
• Steel thickness – too thin plate does not close the flux, causing part of the power to be wasted into the air.
• Steel grade – ideal substrate is high-permeability steel. Stainless steels may have worse magnetic properties.
• Surface finish – full contact is obtained only on polished steel. Any scratches and bumps create air cushions, reducing force.
• Temperature – heating the magnet results in weakening of induction. Check the maximum operating temperature for a given model.

* Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the load capacity is reduced by as much as 75%. In addition, even a minimal clearance {between} the magnet and the plate lowers the load capacity.