UMGZ 42x20x9 [M8] GZ / N38 - magnetic holder external thread

Advantages as well as disadvantages of NdFeB magnets.

Besides their exceptional pulling force, neodymium magnets offer the following advantages:

• They retain attractive force for nearly 10 years – the loss is just ~1% (based on simulations),
• They do not lose their magnetic properties even under strong external field,
• By using a smooth layer of nickel, the element presents an professional look,
• Magnetic induction on the working layer of the magnet is exceptional,
• Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
• Possibility of exact forming as well as optimizing to specific requirements,
• Fundamental importance in advanced technology sectors – they are commonly used in data components, brushless drives, precision medical tools, as well as complex engineering applications.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages of neodymium magnets:

• At strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
• NdFeB 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 usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
• Due to limitations in realizing nuts and complicated shapes in magnets, we propose using cover - magnetic mount.
• Possible danger related to microscopic parts of magnets pose a threat, in case of ingestion, which becomes key in the context of child health protection. Additionally, small elements of these devices can complicate diagnosis medical when they are in the body.
• With large orders the cost of neodymium magnets can be a barrier,

Maximum lifting capacity of the magnet – what contributes to it?

Holding force of 66.00 kg is a measurement result conducted under standard conditions:

• with the application of a yoke made of low-carbon steel, ensuring maximum field concentration
• whose transverse dimension reaches at least 10 mm
• with a plane cleaned and smooth
• with direct contact (no coatings)
• under vertical application of breakaway force (90-degree angle)
• at temperature approx. 20 degrees Celsius

What influences lifting capacity in practice

Holding efficiency impacted by specific conditions, such as (from most important):

• Air gap (betwixt the magnet and the plate), since even a microscopic clearance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to varnish, corrosion or debris).
• Load vector – maximum parameter is reached only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is standardly several times smaller (approx. 1/5 of the lifting capacity).
• Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet limits the lifting capacity (the magnet "punches through" it).
• Material composition – different alloys reacts the same. High carbon content weaken the attraction effect.
• Surface finish – full contact is possible only on smooth steel. Rough texture create air cushions, reducing force.
• Heat – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).

* Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a slight gap {between} the magnet’s surface and the plate decreases the load capacity.