MW 6x2 / N38 - cylindrical magnet

Pros as well as cons of NdFeB magnets.

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

• They have unchanged lifting capacity, and over around ten years their performance decreases symbolically – ~1% (according to theory),
• They maintain their magnetic properties even under external field action,
• A magnet with a smooth silver surface looks better,
• The surface of neodymium magnets generates a unique magnetic field – this is a distinguishing feature,
• Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
• Thanks to flexibility in shaping and the ability to customize to complex applications,
• Wide application in future technologies – they serve a role in mass storage devices, brushless drives, diagnostic systems, as well as technologically advanced constructions.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages of neodymium magnets:

• Brittleness is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a strong case, which not only secures them against impacts but also raises their durability
• Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
• Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
• Limited ability of making threads in the magnet and complex forms - recommended is a housing - magnetic holder.
• Potential hazard resulting from small fragments of magnets pose a threat, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Furthermore, small elements of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
• Due to neodymium price, their price exceeds standard values,

Magnetic strength at its maximum – what contributes to it?

Holding force of 0.66 kg is a measurement result executed under specific, ideal conditions:

• on a plate made of structural steel, optimally conducting the magnetic flux
• with a thickness minimum 10 mm
• with a surface free of scratches
• without any clearance between the magnet and steel
• under axial force direction (90-degree angle)
• at ambient temperature approx. 20 degrees Celsius

Practical lifting capacity: influencing factors

It is worth knowing that the application force will differ influenced by the following factors, in order of importance:

• Distance (betwixt the magnet and the metal), since even a microscopic distance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
• Angle of force application – highest force is available only during pulling at a 90° angle. The force required to slide of the magnet along the plate is usually many times smaller (approx. 1/5 of the lifting capacity).
• Base massiveness – insufficiently thick plate does not accept the full field, causing part of the power to be lost into the air.
• Plate material – mild steel gives the best results. Alloy steels decrease magnetic properties and lifting capacity.
• Surface structure – the smoother and more polished the plate, the better the adhesion and stronger the hold. Roughness acts like micro-gaps.
• Thermal environment – heating the magnet causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

* Lifting capacity testing was performed on a smooth plate of suitable thickness, under perpendicular forces, whereas under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a slight gap {between} the magnet and the plate reduces the holding force.