MW 5x15 / N38 - cylindrical magnet

Advantages and disadvantages of neodymium magnets.

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

• They retain attractive force for around 10 years – the drop is just ~1% (based on simulations),
• They are resistant to demagnetization induced by external magnetic fields,
• A magnet with a smooth silver surface looks better,
• They are known for high magnetic induction at the operating surface, which increases their power,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
• Possibility of accurate modeling as well as adapting to atypical conditions,
• Versatile presence in electronics industry – they are used in mass storage devices, drive modules, diagnostic systems, and modern systems.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages of neodymium magnets:

• At strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
• We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
• They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
• Due to limitations in producing threads and complex forms in magnets, we recommend using cover - magnetic mount.
• Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which becomes key in the context of child health protection. Additionally, small elements of these products are able to disrupt the diagnostic process 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 contributes to it?

Holding force of 4.15 kg is a result of laboratory testing performed under specific, ideal conditions:

• using a base made of mild steel, functioning as a magnetic yoke
• whose transverse dimension equals approx. 10 mm
• with a plane cleaned and smooth
• under conditions of gap-free contact (surface-to-surface)
• during pulling in a direction vertical to the mounting surface
• in stable room temperature

Magnet lifting force in use – key factors

It is worth knowing that the application force will differ subject to elements below, in order of importance:

• Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
• Force direction – catalog parameter refers to detachment vertically. When attempting to slide, the magnet exhibits much less (typically approx. 20-30% of maximum force).
• Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
• Metal type – not every steel reacts the same. Alloy additives worsen the attraction effect.
• Smoothness – full contact is obtained only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
• Thermal factor – hot environment reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

* Lifting capacity was measured by applying a polished steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, whereas under parallel forces the holding force is lower. Additionally, even a slight gap {between} the magnet and the plate reduces the holding force.