UMS 16x6.5x3.5x5 / N38 - conical magnetic holder

Strengths and weaknesses of neodymium magnets.

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

• They have stable power, and over nearly 10 years their attraction force decreases symbolically – ~1% (according to theory),
• They have excellent resistance to weakening of magnetic properties as a result of external fields,
• By covering with a reflective coating of nickel, the element gains an proper look,
• The surface of neodymium magnets generates a powerful magnetic field – this is a key feature,
• Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
• Thanks to flexibility in forming and the ability to adapt to individual projects,
• Universal use in innovative solutions – they find application in data components, drive modules, medical equipment, as well as technologically advanced constructions.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Characteristics of disadvantages of neodymium magnets and ways of using them

• To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
• When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their power 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
• They oxidize in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
• Limited ability of making threads in the magnet and complex forms - recommended is cover - mounting mechanism.
• Health risk resulting from small fragments of magnets are risky, when accidentally swallowed, which becomes key in the context of child safety. It is also worth noting that small components of these products can complicate diagnosis medical after entering the body.
• Due to complex production process, their price exceeds standard values,

Detachment force of the magnet in optimal conditions – what affects it?

Magnet power was defined for optimal configuration, assuming:

• using a sheet made of low-carbon steel, functioning as a magnetic yoke
• with a thickness no less than 10 mm
• characterized by lack of roughness
• under conditions of ideal adhesion (surface-to-surface)
• under vertical application of breakaway force (90-degree angle)
• in stable room temperature

What influences lifting capacity in practice

In practice, the actual lifting capacity results from a number of factors, ranked from crucial:

• Gap between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
• Angle of force application – highest force is obtained only during pulling at a 90° angle. The shear force of the magnet along the plate is usually many times smaller (approx. 1/5 of the lifting capacity).
• Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
• Steel type – mild steel attracts best. Alloy steels decrease magnetic permeability and holding force.
• Surface finish – ideal contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
• Thermal factor – high temperature reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

* Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, whereas under shearing force the load capacity is reduced by as much as fivefold. Moreover, even a small distance {between} the magnet and the plate reduces the load capacity.