UMGW 60x30x15 [M10] GW / N38 - magnetic holder internal thread

Strengths as well as weaknesses of rare earth magnets.

Besides their immense strength, neodymium magnets offer the following advantages:

• They do not lose strength, even during approximately ten years – the decrease in power is only ~1% (according to tests),
• Neodymium magnets are extremely resistant to magnetic field loss caused by external magnetic fields,
• A magnet with a shiny silver surface has an effective appearance,
• Magnets possess very high magnetic induction on the working surface,
• Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
• Due to the possibility of free shaping and adaptation to individualized requirements, magnetic components can be modeled in a wide range of geometric configurations, which makes them more universal,
• Key role in innovative solutions – they find application in HDD drives, drive modules, diagnostic systems, as well as multitasking production systems.
• Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which allows their use in miniature devices

Disadvantages of NdFeB magnets:

• Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a steel housing, which not only secures them against impacts but also raises their durability
• Neodymium magnets lose power 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 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 those in rubber or plastics, which secure oxidation as well as corrosion.
• We suggest casing - magnetic mount, due to difficulties in producing threads inside the magnet and complex shapes.
• Health risk to health – tiny shards of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. Additionally, small components of these products can be problematic in diagnostics medical when they are in the body.
• With mass production the cost of neodymium magnets is a challenge,

Detachment force of the magnet in optimal conditions – what contributes to it?

Holding force of 112 kg is a measurement result executed under the following configuration:

• on a plate made of mild steel, perfectly concentrating the magnetic field
• whose transverse dimension reaches at least 10 mm
• with an ground touching surface
• with total lack of distance (no impurities)
• under perpendicular application of breakaway force (90-degree angle)
• in temp. approx. 20°C

Impact of factors on magnetic holding capacity in practice

It is worth knowing that the magnet holding will differ depending on elements below, starting with the most relevant:

• Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
• Loading method – catalog parameter refers to detachment vertically. When attempting to slide, the magnet holds much less (typically approx. 20-30% of nominal force).
• Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet limits the attraction force (the magnet "punches through" it).
• Material composition – not every steel attracts identically. High carbon content worsen the interaction with the magnet.
• Smoothness – full contact is possible only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
• Thermal factor – hot environment reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

* Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the lifting capacity is smaller. In addition, even a slight gap {between} the magnet and the plate lowers the holding force.