HH 16x5.3 [M3] / N38 - through hole magnetic holder

Advantages as well as disadvantages of rare earth magnets.

Besides their magnetic performance, neodymium magnets are valued for these benefits:

• Their strength is maintained, and after approximately 10 years it decreases only by ~1% (theoretically),
• They maintain their magnetic properties even under strong external field,
• In other words, due to the smooth surface of nickel, the element gains a professional look,
• They feature high magnetic induction at the operating surface, which affects their effectiveness,
• Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
• Thanks to the possibility of precise forming and adaptation to custom requirements, magnetic components can be created in a broad palette of forms and dimensions, which amplifies use scope,
• Wide application in future technologies – they find application in data components, drive modules, medical devices, as well as modern systems.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages of neodymium magnets:

• They are prone to damage upon too strong 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
• We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 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, in case of application outdoors
• We suggest casing - magnetic holder, due to difficulties in creating threads inside the magnet and complex shapes.
• Health risk to health – tiny shards of magnets pose a threat, if swallowed, which becomes key in the context of child health protection. Additionally, small elements of these magnets can complicate diagnosis medical after entering the body.
• Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Maximum magnetic pulling force – what affects it?

The load parameter shown refers to the limit force, measured under ideal test conditions, namely:

• on a plate made of structural steel, perfectly concentrating the magnetic flux
• whose thickness reaches at least 10 mm
• characterized by even structure
• without any insulating layer between the magnet and steel
• during detachment in a direction vertical to the mounting surface
• in neutral thermal conditions

Impact of factors on magnetic holding capacity in practice

In practice, the actual holding force depends on several key aspects, ranked from crucial:

• Clearance – the presence of foreign body (rust, dirt, gap) interrupts the magnetic circuit, which reduces power steeply (even by 50% at 0.5 mm).
• Force direction – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
• Plate thickness – insufficiently thick sheet does not accept the full field, causing part of the flux to be wasted to the other side.
• Plate material – mild steel gives the best results. Alloy steels reduce magnetic permeability and lifting capacity.
• Surface finish – ideal contact is possible only on polished steel. Rough texture create air cushions, reducing force.
• Temperature influence – hot environment reduces pulling force. Too high temperature can permanently demagnetize the magnet.

* Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the holding force is lower. Additionally, even a minimal clearance {between} the magnet and the plate lowers the load capacity.