UMGGZ 88x8.5 [M8] GZ / N38 - rubber magnetic holder external thread

Advantages and disadvantages of rare earth magnets.

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

• Their power remains stable, and after approximately 10 years it decreases only by ~1% (according to research),
• They feature excellent resistance to magnetism drop as a result of external fields,
• By applying a decorative layer of silver, the element has an nice look,
• Magnetic induction on the working part of the magnet remains strong,
• Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for action at temperatures approaching 230°C and above...
• Thanks to versatility in constructing and the ability to customize to complex applications,
• Huge importance in modern technologies – they are used in computer drives, electric motors, medical equipment, also other advanced devices.
• Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

What to avoid - cons of neodymium magnets: tips and applications.

• To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves 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, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
• We recommend cover - magnetic mount, due to difficulties in realizing nuts inside the magnet and complicated forms.
• Potential hazard to health – tiny shards of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child safety. Furthermore, small components of these magnets can be problematic in diagnostics medical when they are in the body.
• Due to expensive raw materials, their price is relatively high,

Best holding force of the magnet in ideal parameters – what contributes to it?

Breakaway force is the result of a measurement for ideal contact conditions, taking into account:

• using a plate made of low-carbon steel, serving as a circuit closing element
• possessing a thickness of min. 10 mm to avoid saturation
• with a surface free of scratches
• with total lack of distance (without impurities)
• during detachment in a direction perpendicular to the plane
• at temperature room level

Determinants of lifting force in real conditions

Effective lifting capacity is affected by working environment parameters, mainly (from priority):

• Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
• Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the maximum value.
• Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of converting into lifting capacity.
• Material type – the best choice is high-permeability steel. Hardened steels may generate lower lifting capacity.
• Plate texture – smooth surfaces guarantee perfect abutment, which increases field saturation. Uneven metal weaken the grip.
• Temperature influence – high temperature weakens magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

* Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the lifting capacity is smaller. In addition, even a small distance {between} the magnet’s surface and the plate decreases the holding force.