MP 5x2.7/1.2x5 C / N38 - ring magnet

Strengths as well as weaknesses of NdFeB magnets.

Besides their high retention, neodymium magnets are valued for these benefits:

• They retain attractive force for almost ten years – the drop is just ~1% (in theory),
• Neodymium magnets prove to be exceptionally resistant to magnetic field loss caused by external magnetic fields,
• In other words, due to the shiny finish of gold, the element gains a professional look,
• Magnets possess impressive magnetic induction on the outer layer,
• Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
• Possibility of custom modeling and modifying to atypical conditions,
• Huge importance in electronics industry – they are commonly used in mass storage devices, electric motors, medical equipment, as well as other advanced devices.
• Thanks to their power density, small magnets offer high operating force, in miniature format,

Disadvantages of neodymium magnets:

• To avoid cracks under impact, we recommend using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
• When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
• Limited ability of producing threads in the magnet and complicated shapes - preferred is a housing - magnetic holder.
• Possible danger to health – tiny shards of magnets can be dangerous, in case of ingestion, which gains importance in the aspect of protecting the youngest. Furthermore, small elements of these products are able to disrupt the diagnostic process medical when they are in the body.
• With budget limitations the cost of neodymium magnets is economically unviable,

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

Magnet power was defined for the most favorable conditions, including:

• using a sheet made of high-permeability steel, acting as a ideal flux conductor
• whose transverse dimension reaches at least 10 mm
• with a plane free of scratches
• without the slightest air gap between the magnet and steel
• for force acting at a right angle (in the magnet axis)
• in neutral thermal conditions

Lifting capacity in practice – influencing factors

Please note that the application force will differ subject to elements below, in order of importance:

• Space between magnet and steel – every millimeter of separation (caused e.g. by veneer or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
• Force direction – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
• Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
• Plate material – mild steel attracts best. Alloy admixtures lower magnetic properties and holding force.
• Surface quality – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
• Thermal environment – temperature increase causes a temporary drop of induction. It is worth remembering the maximum operating temperature for a given model.

* Lifting capacity testing was carried out on a smooth plate of optimal thickness, under perpendicular forces, however under parallel forces the load capacity is reduced by as much as fivefold. Moreover, even a minimal clearance {between} the magnet’s surface and the plate lowers the holding force.