UMGGW 88x8.5 [M6] GW / N38 - magnetic holder rubber internal thread

Advantages as well as disadvantages of NdFeB magnets.

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

• They have stable power, and over around ten years their attraction force decreases symbolically – ~1% (according to theory),
• Magnets perfectly protect themselves against loss of magnetization caused by external fields,
• Thanks to the shiny finish, the surface of nickel, gold-plated, or silver-plated gives an professional appearance,
• They are known for high magnetic induction at the operating surface, which affects their effectiveness,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
• Thanks to freedom in designing and the ability to modify to client solutions,
• Wide application in advanced technology sectors – they are utilized in mass storage devices, electric motors, diagnostic systems, also technologically advanced constructions.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages of neodymium magnets:

• Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a steel housing, which not only secures them against impacts but also increases their durability
• When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
• Limited ability of creating threads in the magnet and complicated forms - recommended is a housing - magnetic holder.
• Health risk related to microscopic parts of magnets are risky, in case of ingestion, which gains importance in the context of child safety. Additionally, small components of these products can disrupt the diagnostic process medical when they are in the body.
• Due to complex production process, their price is relatively high,

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

Holding force of 42.9 kg is a result of laboratory testing executed under standard conditions:

• with the application of a yoke made of special test steel, ensuring full magnetic saturation
• possessing a massiveness of at least 10 mm to avoid saturation
• with an polished contact surface
• with total lack of distance (no paint)
• under axial force direction (90-degree angle)
• in stable room temperature

Determinants of lifting force in real conditions

Effective lifting capacity is affected by working environment parameters, including (from most important):

• Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
• Loading method – catalog parameter refers to pulling vertically. When applying parallel force, the magnet exhibits much less (typically approx. 20-30% of maximum force).
• Base massiveness – too thin plate does not close the flux, causing part of the flux to be escaped to the other side.
• Chemical composition of the base – low-carbon steel gives the best results. Alloy steels decrease magnetic properties and lifting capacity.
• Surface structure – the more even the surface, the larger the contact zone and stronger the hold. Roughness acts like micro-gaps.
• Temperature – heating the magnet results in weakening of force. It is worth remembering the thermal limit for a given model.

* Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, however under parallel forces the lifting capacity is smaller. Additionally, even a slight gap {between} the magnet and the plate lowers the holding force.