MW 10x1.5 / N38 - cylindrical magnet

Advantages and disadvantages of rare earth magnets.

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

• Their strength is maintained, and after around ten years it drops only by ~1% (theoretically),
• They maintain their magnetic properties even under close interference source,
• By covering with a smooth coating of silver, the element acquires an elegant look,
• Magnetic induction on the surface of the magnet remains 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...
• Possibility of individual machining as well as optimizing to precise conditions,
• Fundamental importance in electronics industry – they are used in computer drives, motor assemblies, medical equipment, also complex engineering applications.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages of neodymium magnets:

• They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
• NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
• When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
• Due to limitations in producing nuts and complex shapes in magnets, we propose using cover - magnetic mechanism.
• Potential hazard resulting from small fragments of magnets pose a threat, in case of ingestion, which becomes key in the context of child safety. Furthermore, tiny parts of these magnets are able to be problematic in diagnostics medical after entering the body.
• Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

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

The load parameter shown concerns the maximum value, obtained under ideal test conditions, namely:

• on a block made of mild steel, effectively closing the magnetic flux
• possessing a thickness of minimum 10 mm to avoid saturation
• with a surface free of scratches
• without the slightest insulating layer between the magnet and steel
• under vertical force direction (90-degree angle)
• at conditions approx. 20°C

Practical lifting capacity: influencing factors

Effective lifting capacity is influenced by specific conditions, such as (from priority):

• Gap between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
• Loading method – catalog parameter refers to detachment vertically. When slipping, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
• Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
• Material composition – not every steel attracts identically. High carbon content weaken the interaction with the magnet.
• Surface structure – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Unevenness creates an air distance.
• Temperature influence – hot environment reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

* Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under shearing force the holding force is lower. Additionally, even a slight gap {between} the magnet’s surface and the plate lowers the holding force.