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

Advantages and disadvantages of neodymium magnets.

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

• They retain attractive force for around ten years – the drop is just ~1% (according to analyses),
• Neodymium magnets are extremely resistant to demagnetization caused by magnetic disturbances,
• By applying a smooth layer of gold, the element presents an modern look,
• They show high magnetic induction at the operating surface, which improves attraction properties,
• Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
• Thanks to freedom in shaping and the ability to modify to complex applications,
• Wide application in modern technologies – they find application in magnetic memories, electromotive mechanisms, medical equipment, as well as technologically advanced constructions.
• Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which makes them useful in compact constructions

Disadvantages of neodymium magnets:

• At strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
• When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
• We recommend a housing - magnetic holder, due to difficulties in realizing threads inside the magnet and complicated forms.
• Possible danger resulting from small fragments of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child health protection. It is also worth noting that small components of these magnets can be problematic in diagnostics medical after entering the body.
• With large orders the cost of neodymium magnets is economically unviable,

Breakaway strength of the magnet in ideal conditions – what it depends on?

Breakaway force was determined for optimal configuration, taking into account:

• with the application of a sheet made of special test steel, ensuring maximum field concentration
• possessing a thickness of at least 10 mm to ensure full flux closure
• characterized by smoothness
• without any clearance between the magnet and steel
• under vertical force vector (90-degree angle)
• at room temperature

Determinants of lifting force in real conditions

It is worth knowing that the application force may be lower subject to the following factors, starting with the most relevant:

• Air gap (betwixt the magnet and the plate), as even a very small distance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
• Load vector – maximum parameter is available only during perpendicular pulling. The shear force of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
• Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
• Chemical composition of the base – low-carbon steel gives the best results. Alloy admixtures lower magnetic properties and holding force.
• Surface structure – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
• Heat – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).

* Lifting capacity testing was conducted on a smooth plate of optimal thickness, under perpendicular forces, whereas under parallel forces the lifting capacity is smaller. Moreover, even a slight gap {between} the magnet and the plate reduces the load capacity.