UMGW 32x18x8 [M6] GW / N38 - magnetic holder internal thread

Advantages as well as disadvantages of NdFeB magnets.

In addition to their long-term stability, neodymium magnets provide the following advantages:

• Their magnetic field is maintained, and after around 10 years it decreases only by ~1% (theoretically),
• Magnets effectively defend themselves against demagnetization caused by foreign field sources,
• The use of an aesthetic finish of noble metals (nickel, gold, silver) causes the element to present itself better,
• Magnetic induction on the surface of the magnet remains extremely intense,
• Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
• Possibility of detailed modeling as well as optimizing to individual needs,
• Key role in future technologies – they serve a role in hard drives, electric motors, medical devices, as well as other advanced devices.
• Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Disadvantages of neodymium magnets:

• To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
• We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
• They oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
• Limited ability of producing nuts in the magnet and complex forms - recommended is a housing - mounting mechanism.
• Health risk related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that small components of these products can be problematic in diagnostics medical after entering the body.
• Due to neodymium price, their price exceeds standard values,

Maximum magnetic pulling force – what contributes to it?

The specified lifting capacity represents the limit force, recorded under laboratory conditions, specifically:

• using a base made of mild steel, serving as a circuit closing element
• with a cross-section of at least 10 mm
• with a plane cleaned and smooth
• with direct contact (without coatings)
• under axial force vector (90-degree angle)
• at room temperature

What influences lifting capacity in practice

In practice, the actual lifting capacity depends on many variables, presented from the most important:

• Gap between surfaces – every millimeter of distance (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
• Direction of force – maximum parameter is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is usually several times lower (approx. 1/5 of the lifting capacity).
• Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
• Metal type – not every steel attracts identically. Alloy additives worsen the attraction effect.
• Base smoothness – the smoother and more polished the plate, the better the adhesion and stronger the hold. Roughness acts like micro-gaps.
• Temperature influence – hot environment weakens pulling force. Too high temperature can permanently damage the magnet.

* Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the holding force is lower. In addition, even a minimal clearance {between} the magnet and the plate decreases the lifting capacity.