UMGZ 48x24x11.5 [M8] GZ / N38 - magnetic holder external thread

Pros and cons of neodymium magnets.

Apart from their notable power, neodymium magnets have these key benefits:

• They have unchanged lifting capacity, and over nearly 10 years their attraction force decreases symbolically – ~1% (according to theory),
• Neodymium magnets are extremely resistant to magnetic field loss caused by magnetic disturbances,
• A magnet with a metallic gold surface has better aesthetics,
• They are known for high magnetic induction at the operating surface, which increases their power,
• Neodymium magnets are known for very high magnetic induction and the ability to work at temperatures up to 230°C or higher (depending on the magnetic form),
• Possibility of accurate shaping and adjusting to complex applications,
• Key role in modern technologies – they serve a role in data components, drive modules, medical devices, and technologically advanced constructions.
• Thanks to their power density, small magnets offer high operating force, with minimal size,

Disadvantages of NdFeB magnets:

• Brittleness is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a special holder, which not only protects them against impacts but also raises their durability
• Neodymium 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 very resistant to heat
• When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
• Due to limitations in producing threads and complex forms in magnets, we recommend using a housing - magnetic mechanism.
• Potential hazard related to microscopic parts of magnets are risky, when accidentally swallowed, which is particularly important in the context of child safety. It is also worth noting that small elements of these devices are able to be problematic in diagnostics medical after entering the body.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Breakaway strength of the magnet in ideal conditions – what affects it?

Information about lifting capacity is the result of a measurement for ideal contact conditions, taking into account:

• using a base made of low-carbon steel, functioning as a ideal flux conductor
• with a thickness minimum 10 mm
• with an ideally smooth contact surface
• under conditions of ideal adhesion (surface-to-surface)
• under perpendicular force vector (90-degree angle)
• at ambient temperature room level

Lifting capacity in real conditions – factors

Effective lifting capacity is influenced by working environment parameters, such as (from most important):

• Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
• Loading method – catalog parameter refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (typically 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 – mild steel gives the best results. Alloy admixtures lower magnetic properties and lifting capacity.
• Smoothness – ideal contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
• Thermal conditions – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).

* Lifting capacity was assessed by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under vertically applied force, however under attempts to slide the magnet the load capacity is reduced by as much as fivefold. In addition, even a slight gap {between} the magnet’s surface and the plate lowers the lifting capacity.