HH 25x7.7 [M5] / N38 - through hole magnetic holder

Pros as well as cons of rare earth magnets.

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

• Their power is maintained, and after approximately ten years it drops only by ~1% (theoretically),
• They are extremely resistant to demagnetization induced by external magnetic fields,
• A magnet with a smooth silver surface is more attractive,
• The surface of neodymium magnets generates a maximum magnetic field – this is a key feature,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
• Thanks to flexibility in constructing and the capacity to adapt to client solutions,
• Huge importance in innovative solutions – they serve a role in computer drives, electric drive systems, diagnostic systems, and technologically advanced constructions.
• Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Characteristics of disadvantages of neodymium magnets: tips and applications.

• At very strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
• Neodymium magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (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 start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
• Due to limitations in producing nuts and complex forms in magnets, we recommend using casing - magnetic holder.
• Potential hazard related to microscopic parts of magnets can be dangerous, in case of ingestion, which gains importance in the aspect of protecting the youngest. It is also worth noting that small elements of these devices are able to be problematic in diagnostics medical when they are in the body.
• High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities

Highest magnetic holding force – what contributes to it?

The specified lifting capacity represents the maximum value, measured under optimal environment, namely:

• on a block made of structural steel, optimally conducting the magnetic flux
• with a cross-section no less than 10 mm
• with an polished contact surface
• under conditions of ideal adhesion (surface-to-surface)
• for force acting at a right angle (in the magnet axis)
• at ambient temperature room level

Key elements affecting lifting force

Please note that the application force may be lower subject to elements below, in order of importance:

• Clearance – the presence of any layer (rust, dirt, gap) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
• Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
• Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
• Material type – the best choice is high-permeability steel. Hardened steels may have worse magnetic properties.
• Plate texture – ground elements guarantee perfect abutment, which improves force. Uneven metal weaken the grip.
• Thermal environment – heating the magnet causes a temporary drop of induction. It is worth remembering the maximum operating temperature for a given model.

* Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under parallel forces the lifting capacity is smaller. Additionally, even a small distance {between} the magnet and the plate reduces the load capacity.