UMGGZ 22x6 [M4] GZ / N38 - rubber magnetic holder external thread

Pros as well as cons of rare earth magnets.

Besides their remarkable field intensity, neodymium magnets offer the following advantages:

• They do not lose power, even over around ten years – the decrease in lifting capacity is only ~1% (based on measurements),
• Magnets very well defend themselves against demagnetization caused by ambient magnetic noise,
• In other words, due to the aesthetic surface of silver, the element is aesthetically pleasing,
• They are known for high magnetic induction at the operating surface, which affects their effectiveness,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
• Thanks to the option of flexible forming and adaptation to unique solutions, magnetic components can be manufactured in a broad palette of geometric configurations, which increases their versatility,
• Fundamental importance in modern technologies – they are commonly used in magnetic memories, electric motors, diagnostic systems, as well as multitasking production systems.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages of neodymium magnets:

• 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 decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
• Magnets exposed to a humid environment can rust. Therefore when using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
• Due to limitations in creating threads and complicated forms in magnets, we recommend using a housing - magnetic mount.
• Possible danger resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that tiny parts of these magnets are able to be problematic in diagnostics medical when they are in the body.
• Due to neodymium price, their price is higher than average,

Maximum lifting force for a neodymium magnet – what affects it?

The force parameter is a result of laboratory testing performed under standard conditions:

• with the contact of a yoke made of special test steel, guaranteeing full magnetic saturation
• whose transverse dimension is min. 10 mm
• characterized by lack of roughness
• under conditions of ideal adhesion (surface-to-surface)
• for force acting at a right angle (in the magnet axis)
• at standard ambient temperature

Determinants of practical lifting force of a magnet

Please note that the application force will differ depending on the following factors, starting with the most relevant:

• Gap between magnet and steel – every millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
• Angle of force application – maximum parameter is obtained only during pulling at a 90° angle. The force required to slide of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
• Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
• Steel grade – ideal substrate is pure iron steel. Hardened steels may generate lower lifting capacity.
• Surface quality – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
• Operating temperature – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).

* Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under parallel forces the holding force is lower. Moreover, even a small distance {between} the magnet’s surface and the plate lowers the lifting capacity.