UMP 75x24 [M8+M10] GW F 200 kg - search holder

Pros and cons of neodymium magnets.

Besides their immense magnetic power, neodymium magnets offer the following advantages:

• They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (according to literature),
• Magnets effectively protect themselves against demagnetization caused by foreign field sources,
• In other words, due to the glossy finish of nickel, the element looks attractive,
• The surface of neodymium magnets generates a concentrated magnetic field – this is a distinguishing feature,
• Due to their exceptional temperature resistance, they can operate (depending on the shape) even at temperatures up to 230°C or more,
• Possibility of individual creating as well as adapting to defined applications,
• Key role in innovative solutions – they serve a role in computer drives, electromotive mechanisms, advanced medical instruments, and technologically advanced constructions.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Problematic aspects of neodymium magnets and proposals for their use:

• At strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
• We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
• Magnets exposed to a humid environment can rust. Therefore during using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
• Due to limitations in creating nuts and complex forms in magnets, we recommend using cover - magnetic mechanism.
• Health risk to health – tiny shards of magnets pose a threat, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that tiny parts of these magnets can complicate diagnosis medical when they are in the body.
• With large orders the cost of neodymium magnets is a challenge,

Maximum magnetic pulling force – what it depends on?

The force parameter is a measurement result performed under standard conditions:

• on a plate made of mild steel, optimally conducting the magnetic flux
• possessing a thickness of minimum 10 mm to avoid saturation
• with a surface cleaned and smooth
• with zero gap (no impurities)
• under axial force direction (90-degree angle)
• in stable room temperature

Practical lifting capacity: influencing factors

During everyday use, the real power results from several key aspects, listed from the most important:

• Clearance – existence of any layer (rust, tape, gap) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
• Force direction – remember that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
• Steel thickness – too thin plate does not accept the full field, causing part of the flux to be lost into the air.
• Steel grade – ideal substrate is pure iron steel. Stainless steels may attract less.
• Surface structure – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
• Thermal environment – heating the magnet causes a temporary drop of force. It is worth remembering the thermal limit for a given model.

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