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

Pros as well as cons of rare earth magnets.

Besides their remarkable field intensity, neodymium magnets offer the following advantages:

• They retain full power for around ten years – the drop is just ~1% (according to analyses),
• They retain their magnetic properties even under external field action,
• Thanks to the elegant finish, the surface of nickel, gold, or silver-plated gives an aesthetic appearance,
• Magnets are distinguished by exceptionally strong magnetic induction on the outer layer,
• Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures approaching 230°C and above...
• Thanks to modularity in shaping and the ability to modify to client solutions,
• Wide application in future technologies – they are commonly used in magnetic memories, electromotive mechanisms, diagnostic systems, as well as complex engineering applications.
• Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which allows their use in compact constructions

What to avoid - cons of neodymium magnets: application proposals

• To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
• When exposed to high temperature, neodymium magnets experience a drop in power. 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
• When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
• Due to limitations in creating nuts and complicated shapes in magnets, we propose using a housing - magnetic mechanism.
• Health risk related to microscopic parts of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child health protection. Furthermore, tiny parts of these magnets can disrupt the diagnostic process medical after entering the body.
• Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Maximum magnetic pulling force – what contributes to it?

Breakaway force was defined for the most favorable conditions, including:

• with the use of a yoke made of special test steel, ensuring full magnetic saturation
• with a cross-section of at least 10 mm
• with a surface free of scratches
• without any air gap between the magnet and steel
• under vertical force vector (90-degree angle)
• in temp. approx. 20°C

Determinants of lifting force in real conditions

During everyday use, the actual holding force depends on a number of factors, listed from crucial:

• Distance – existence of any layer (rust, tape, gap) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
• Loading method – catalog parameter refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
• Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
• Steel type – mild steel gives the best results. Alloy steels reduce magnetic properties and lifting capacity.
• Plate texture – ground elements guarantee perfect abutment, which increases field saturation. Uneven metal weaken the grip.
• Heat – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).

* Lifting capacity was measured with the use of a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, however under parallel forces the load capacity is reduced by as much as fivefold. Additionally, even a slight gap {between} the magnet’s surface and the plate reduces the lifting capacity.