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

Pros as well as cons of neodymium magnets.

Besides their durability, neodymium magnets are valued for these benefits:

• They retain full power for almost 10 years – the loss is just ~1% (based on simulations),
• Magnets perfectly defend themselves against loss of magnetization caused by ambient magnetic noise,
• The use of an elegant coating of noble metals (nickel, gold, silver) causes the element to have aesthetics,
• Magnetic induction on the working part of the magnet remains impressive,
• Neodymium magnets are characterized by very 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...
• Thanks to flexibility in constructing and the capacity to modify to specific needs,
• Fundamental importance in electronics industry – they serve a role in hard drives, motor assemblies, medical equipment, also multitasking production systems.
• Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which makes them useful in compact constructions

Disadvantages of neodymium magnets:

• To avoid cracks under impact, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its 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 corrode. Therefore when using outdoors, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture
• Due to limitations in realizing threads and complicated shapes in magnets, we recommend using casing - magnetic mount.
• Potential hazard to health – tiny shards of magnets are risky, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that small elements of these products can be problematic in diagnostics medical in case of swallowing.
• High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Magnetic strength at its maximum – what affects it?

The specified lifting capacity represents the peak performance, measured under optimal environment, specifically:

• with the contact of a sheet made of special test steel, ensuring maximum field concentration
• possessing a massiveness of at least 10 mm to ensure full flux closure
• with a plane perfectly flat
• with zero gap (without paint)
• under axial application of breakaway force (90-degree angle)
• in neutral thermal conditions

Practical lifting capacity: influencing factors

Holding efficiency is influenced by working environment parameters, mainly (from most important):

• Clearance – existence of any layer (rust, tape, air) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
• Loading method – catalog parameter refers to detachment vertically. When applying parallel force, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
• Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet limits the lifting capacity (the magnet "punches through" it).
• Plate material – low-carbon steel gives the best results. Higher carbon content reduce magnetic properties and holding force.
• Surface finish – full contact is possible only on smooth steel. Rough texture reduce the real contact area, reducing force.
• Temperature influence – high temperature weakens magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

* Lifting capacity testing was carried out on a smooth plate of optimal thickness, under a perpendicular pulling force, however under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a small distance {between} the magnet’s surface and the plate reduces the lifting capacity.