UMGGW 29x8 [M4] GW / N38 - magnetic holder rubber internal thread

Strengths and weaknesses of NdFeB magnets.

Besides their magnetic performance, neodymium magnets are valued for these benefits:

• They retain magnetic properties for nearly 10 years – the drop is just ~1% (according to analyses),
• Neodymium magnets are remarkably resistant to magnetic field loss caused by external interference,
• The use of an refined coating of noble metals (nickel, gold, silver) causes the element to look better,
• Neodymium magnets create maximum magnetic induction on a small surface, which allows for strong attraction,
• Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
• Thanks to freedom in forming and the capacity to customize to client solutions,
• Wide application in modern technologies – they serve a role in HDD drives, drive modules, advanced medical instruments, as well as technologically advanced constructions.
• Thanks to their power density, small magnets offer high operating force, occupying minimum space,

What to avoid - cons of neodymium magnets and ways of using them

• They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only protects the magnet but also improves its resistance to damage
• NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
• When exposed to humidity, magnets usually 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 producing nuts and complicated shapes in magnets, we propose using a housing - magnetic mount.
• Potential hazard related to microscopic parts of magnets pose a threat, if swallowed, which becomes key in the context of child health protection. It is also worth noting that tiny parts of these devices can disrupt the diagnostic process medical when they are in the body.
• Due to complex production process, their price exceeds standard values,

Maximum holding power of the magnet – what contributes to it?

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

• using a base made of mild steel, functioning as a magnetic yoke
• with a thickness no less than 10 mm
• characterized by lack of roughness
• with zero gap (without impurities)
• during detachment in a direction vertical to the mounting surface
• in temp. approx. 20°C

Lifting capacity in real conditions – factors

It is worth knowing that the working load may be lower influenced by elements below, starting with the most relevant:

• Space between surfaces – every millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
• Force direction – remember that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
• Steel thickness – too thin plate causes magnetic saturation, causing part of the power to be escaped into the air.
• Material composition – different alloys reacts the same. Alloy additives worsen the interaction with the magnet.
• Surface condition – ground elements ensure maximum contact, which improves field saturation. Uneven metal reduce efficiency.
• Thermal conditions – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and at low temperatures they can be stronger (up to a certain limit).

* Lifting capacity was measured with the use of a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, however under parallel forces the load capacity is reduced by as much as 75%. In addition, even a minimal clearance {between} the magnet and the plate reduces the holding force.