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

Pros as well as cons of NdFeB magnets.

Besides their stability, neodymium magnets are valued for these benefits:

• They do not lose power, even during around 10 years – the decrease in strength is only ~1% (according to tests),
• They do not lose their magnetic properties even under external field action,
• By using a reflective coating of gold, the element has an aesthetic look,
• They are known for high magnetic induction at the operating surface, which improves attraction properties,
• Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
• Possibility of custom shaping as well as adapting to atypical applications,
• Wide application in advanced technology sectors – they are used in HDD drives, electric drive systems, medical equipment, as well as industrial machines.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Characteristics of disadvantages of neodymium magnets and proposals for their use:

• To avoid cracks under impact, we suggest using special steel holders. Such a solution secures 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 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 recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
• We recommend cover - magnetic holder, due to difficulties in realizing threads inside the magnet and complicated shapes.
• Health risk resulting from small fragments of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child health protection. Furthermore, tiny parts of these products are able to be problematic in diagnostics medical after entering the body.
• Due to expensive raw materials, their price is higher than average,

Magnetic strength at its maximum – what it depends on?

The specified lifting capacity represents the peak performance, obtained under laboratory conditions, namely:

• on a block made of mild steel, perfectly concentrating the magnetic field
• with a thickness minimum 10 mm
• with an ideally smooth touching surface
• without the slightest air gap between the magnet and steel
• under vertical force direction (90-degree angle)
• in neutral thermal conditions

What influences lifting capacity in practice

In real-world applications, the actual holding force depends on several key aspects, listed from crucial:

• Air gap (betwixt the magnet and the metal), as even a microscopic clearance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to paint, rust or debris).
• Load vector – highest force is available only during perpendicular pulling. The resistance to sliding of the magnet along the surface is usually several times lower (approx. 1/5 of the lifting capacity).
• Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
• Metal type – not every steel reacts the same. Alloy additives worsen the attraction effect.
• Smoothness – ideal contact is possible only on smooth steel. Any scratches and bumps create air cushions, reducing force.
• Operating temperature – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).

* Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Moreover, even a small distance {between} the magnet and the plate reduces the lifting capacity.