UMGGW 88x8.5 [M6] GW / N38 - magnetic holder rubber internal thread

Advantages and disadvantages of rare earth magnets.

Apart from their strong holding force, neodymium magnets have these key benefits:

• They do not lose strength, even during around 10 years – the drop in power is only ~1% (according to tests),
• They are noted for resistance to demagnetization induced by presence of other magnetic fields,
• In other words, due to the glossy surface of gold, the element becomes visually attractive,
• Neodymium magnets deliver maximum magnetic induction on a contact point, which increases force concentration,
• Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures reaching 230°C and above...
• Possibility of accurate forming and modifying to atypical applications,
• Significant place in electronics industry – they are commonly used in computer drives, electromotive mechanisms, medical equipment, as well as modern systems.
• Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which enables their usage in small systems

Disadvantages of NdFeB magnets:

• They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also increases its resistance to damage
• Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
• Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
• Due to limitations in creating nuts and complicated forms in magnets, we recommend using casing - magnetic holder.
• Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which becomes key in the context of child health protection. Furthermore, small components of these devices can disrupt the diagnostic process medical after entering the body.
• Due to complex production process, their price is relatively high,

Maximum magnetic pulling force – what contributes to it?

The lifting capacity listed is a measurement result performed under standard conditions:

• using a base made of high-permeability steel, serving as a circuit closing element
• possessing a massiveness of min. 10 mm to avoid saturation
• with an ideally smooth touching surface
• without any insulating layer between the magnet and steel
• under vertical application of breakaway force (90-degree angle)
• at room temperature

Determinants of lifting force in real conditions

Holding efficiency is influenced by specific conditions, mainly (from priority):

• Gap between magnet and steel – every millimeter of separation (caused e.g. by varnish or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
• Load vector – highest force is obtained only during perpendicular pulling. The force required to slide of the magnet along the surface is usually several times lower (approx. 1/5 of the lifting capacity).
• Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
• Steel grade – the best choice is high-permeability steel. Stainless steels may generate lower lifting capacity.
• Surface finish – full contact is possible only on polished steel. Any scratches and bumps create air cushions, reducing force.
• Thermal factor – hot environment reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

* Lifting capacity was measured with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Additionally, even a slight gap {between} the magnet and the plate reduces the load capacity.