HH 36x7.5 [M6] / N38 - through hole magnetic holder

Strengths and weaknesses of neodymium magnets.

Apart from their superior magnetic energy, neodymium magnets have these key benefits:

• They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (in laboratory conditions),
• Magnets very well protect themselves against loss of magnetization caused by external fields,
• By applying a shiny layer of gold, the element has an professional look,
• Magnetic induction on the surface of the magnet turns out to be strong,
• 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...
• Thanks to versatility in designing and the ability to modify to individual projects,
• Fundamental importance in high-tech industry – they are utilized in magnetic memories, electromotive mechanisms, advanced medical instruments, as well as industrial machines.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Cons of neodymium magnets and ways of using them

• They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
• Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
• Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
• Due to limitations in creating nuts and complicated shapes in magnets, we recommend using casing - magnetic mechanism.
• Health risk related to microscopic parts of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child health protection. Furthermore, small components of these devices are able to be problematic in diagnostics medical after entering the body.
• High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Maximum lifting force for a neodymium magnet – what it depends on?

The force parameter is a result of laboratory testing conducted under specific, ideal conditions:

• using a plate made of high-permeability steel, functioning as a magnetic yoke
• possessing a thickness of min. 10 mm to ensure full flux closure
• with a surface free of scratches
• under conditions of gap-free contact (metal-to-metal)
• during pulling in a direction vertical to the mounting surface
• at standard ambient temperature

Lifting capacity in real conditions – factors

Please note that the working load will differ influenced by elements below, in order of importance:

• Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
• Loading method – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds much less (often approx. 20-30% of maximum force).
• Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of generating force.
• Steel type – low-carbon steel gives the best results. Higher carbon content reduce magnetic permeability and holding force.
• Surface condition – ground elements ensure maximum contact, which improves field saturation. Uneven metal weaken the grip.
• Heat – neodymium magnets have a sensitivity to temperature. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).

* Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under shearing force the load capacity is reduced by as much as 5 times. Moreover, even a minimal clearance {between} the magnet and the plate decreases the holding force.