HH 16x5.3 [M3] / N38 - through hole magnetic holder

Strengths and weaknesses of NdFeB magnets.

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:

• They retain magnetic properties for around ten years – the loss is just ~1% (based on simulations),
• Magnets effectively protect themselves against loss of magnetization caused by ambient magnetic noise,
• Thanks to the elegant finish, the layer of Ni-Cu-Ni, gold-plated, or silver gives an elegant appearance,
• Neodymium magnets create maximum magnetic induction on a small surface, which allows for strong attraction,
• Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures approaching 230°C and above...
• Possibility of individual machining and modifying to concrete conditions,
• Huge importance in advanced technology sectors – they serve a role in magnetic memories, electric drive systems, advanced medical instruments, also other advanced devices.
• Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which makes them useful in miniature devices

Characteristics of disadvantages of neodymium magnets: tips and applications.

• Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a strong case, which not only protects them against impacts but also increases their durability
• Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
• Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
• Limited ability of producing threads in the magnet and complicated forms - recommended is cover - mounting mechanism.
• Health risk resulting from small fragments of magnets are risky, if swallowed, which is particularly important in the context of child safety. Furthermore, small elements of these devices can complicate diagnosis medical when they are in the body.
• Due to complex production process, their price is relatively high,

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

The specified lifting capacity represents the limit force, measured under laboratory conditions, namely:

• using a base made of high-permeability steel, serving as a ideal flux conductor
• whose thickness reaches at least 10 mm
• with a plane cleaned and smooth
• under conditions of ideal adhesion (surface-to-surface)
• during pulling in a direction vertical to the mounting surface
• in temp. approx. 20°C

Practical aspects of lifting capacity – factors

Please note that the application force will differ subject to elements below, in order of importance:

• Space between surfaces – every millimeter of distance (caused e.g. by varnish or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
• Force direction – catalog parameter refers to detachment vertically. When applying parallel force, the magnet exhibits much less (often approx. 20-30% of nominal force).
• Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
• Steel type – low-carbon steel gives the best results. Alloy admixtures decrease magnetic permeability and lifting capacity.
• Surface condition – smooth surfaces ensure maximum contact, which improves force. Uneven metal weaken the grip.
• Thermal factor – hot environment reduces pulling force. Too high temperature can permanently demagnetize the magnet.

* Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under shearing force the lifting capacity is smaller. In addition, even a minimal clearance {between} the magnet and the plate lowers the lifting capacity.