UMGGW 22x6 [M4] GW / N38 - magnetic holder rubber internal thread

Pros and cons of NdFeB magnets.

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

• They do not lose power, even over approximately ten years – the decrease in power is only ~1% (based on measurements),
• They are noted for resistance to demagnetization induced by presence of other magnetic fields,
• A magnet with a shiny gold surface looks better,
• They feature high magnetic induction at the operating surface, which affects their effectiveness,
• Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
• Possibility of exact forming as well as adapting to precise applications,
• Versatile presence in modern industrial fields – they find application in data components, electromotive mechanisms, advanced medical instruments, and complex engineering applications.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages of neodymium magnets:

• Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a special holder, which not only protects them against impacts but also raises their durability
• Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
• When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
• Limited possibility of creating threads in the magnet and complicated shapes - recommended is casing - magnetic holder.
• Health risk resulting from small fragments of magnets pose a threat, in case of ingestion, which is particularly important in the context of child health protection. It is also worth noting that small elements of these magnets are able to be problematic in diagnostics medical when they are in the body.
• Due to expensive raw materials, their price exceeds standard values,

Maximum lifting force for a neodymium magnet – what contributes to it?

The declared magnet strength represents the maximum value, recorded under laboratory conditions, meaning:

• using a base made of low-carbon steel, serving as a circuit closing element
• whose thickness equals approx. 10 mm
• characterized by smoothness
• under conditions of gap-free contact (metal-to-metal)
• under perpendicular force direction (90-degree angle)
• at ambient temperature room level

Magnet lifting force in use – key factors

Please note that the working load will differ depending on elements below, starting with the most relevant:

• Gap between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
• Pull-off angle – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
• Steel thickness – insufficiently thick plate causes magnetic saturation, causing part of the flux to be lost to the other side.
• Material type – ideal substrate is pure iron steel. Stainless steels may generate lower lifting capacity.
• Base smoothness – the more even the surface, the better the adhesion and stronger the hold. Roughness creates an air distance.
• Temperature influence – high temperature reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

* Lifting capacity testing was carried out on a smooth plate of optimal thickness, under a perpendicular pulling force, however under shearing force the holding force is lower. Moreover, even a small distance {between} the magnet and the plate decreases the holding force.