MW 8x20 / N38 - cylindrical magnet

Pros and cons of NdFeB magnets.

Besides their exceptional pulling force, neodymium magnets offer the following advantages:

• They retain full power for almost ten years – the drop is just ~1% (in theory),
• They have excellent resistance to weakening of magnetic properties when exposed to opposing magnetic fields,
• The use of an refined layer of noble metals (nickel, gold, silver) causes the element to have aesthetics,
• Magnetic induction on the working part of the magnet remains exceptional,
• Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
• Thanks to versatility in constructing and the capacity to customize to client solutions,
• Significant place in future technologies – they are utilized in hard drives, electric drive systems, advanced medical instruments, and complex engineering applications.
• Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Problematic aspects of neodymium magnets: tips and applications.

• They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only shields the magnet but also improves its resistance to damage
• When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their power 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
• Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
• Limited ability of creating nuts in the magnet and complicated forms - preferred is casing - magnet mounting.
• Possible danger related to microscopic parts of magnets pose a threat, in case of ingestion, which is particularly important in the aspect of protecting the youngest. It is also worth noting that tiny parts of these products are able to disrupt the diagnostic process medical after entering the body.
• With large orders the cost of neodymium magnets is economically unviable,

Maximum holding power of the magnet – what contributes to it?

The declared magnet strength concerns the limit force, recorded under optimal environment, meaning:

• on a plate made of mild steel, optimally conducting the magnetic field
• with a cross-section of at least 10 mm
• with an polished touching surface
• with zero gap (without coatings)
• during pulling in a direction perpendicular to the plane
• at room temperature

Magnet lifting force in use – key factors

During everyday use, the actual holding force results from several key aspects, ranked from crucial:

• Space between magnet and steel – every millimeter of distance (caused e.g. by varnish or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
• Direction of force – maximum parameter is reached only during pulling at a 90° angle. The shear force of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
• Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of generating force.
• Steel type – mild steel gives the best results. Alloy admixtures decrease magnetic permeability and holding force.
• Plate texture – smooth surfaces ensure maximum contact, which improves field saturation. Uneven metal reduce efficiency.
• Thermal environment – temperature increase results in weakening of force. Check the maximum operating temperature for a given model.

* Lifting capacity was assessed by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, however under attempts to slide the magnet the lifting capacity is smaller. In addition, even a minimal clearance {between} the magnet’s surface and the plate decreases the load capacity.