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

Strengths and weaknesses of neodymium magnets.

Besides their remarkable strength, neodymium magnets offer the following advantages:

• Their magnetic field is durable, and after around 10 years it drops only by ~1% (according to research),
• Neodymium magnets are exceptionally resistant to demagnetization caused by magnetic disturbances,
• In other words, due to the smooth surface of silver, the element gains visual value,
• They are known for high magnetic induction at the operating surface, which increases their power,
• Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
• Thanks to freedom in constructing and the capacity to modify to client solutions,
• Fundamental importance in innovative solutions – they find application in magnetic memories, electromotive mechanisms, medical equipment, as well as other advanced devices.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Characteristics of disadvantages of neodymium magnets and ways of using them

• Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a steel housing, which not only secures them against impacts but also increases their durability
• We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
• Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
• Limited ability of making nuts in the magnet and complex forms - preferred is a housing - magnet mounting.
• Health risk to health – tiny shards of magnets are risky, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small components of these devices are able to be problematic in diagnostics medical in case of swallowing.
• Due to expensive raw materials, their price is higher than average,

Best holding force of the magnet in ideal parameters – what contributes to it?

The force parameter is a result of laboratory testing performed under the following configuration:

• using a base made of high-permeability steel, serving as a circuit closing element
• whose transverse dimension is min. 10 mm
• characterized by smoothness
• under conditions of gap-free contact (metal-to-metal)
• for force acting at a right angle (pull-off, not shear)
• at ambient temperature approx. 20 degrees Celsius

Lifting capacity in real conditions – factors

In real-world applications, the actual lifting capacity depends on several key aspects, listed from the most important:

• Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
• Loading method – declared lifting capacity refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
• Element thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
• Plate material – low-carbon steel gives the best results. Alloy steels lower magnetic properties and holding force.
• Plate texture – ground elements ensure maximum contact, which improves force. Uneven metal reduce efficiency.
• Heat – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures they can be stronger (up to a certain limit).

* Lifting capacity testing was carried out on a smooth plate of suitable thickness, under perpendicular forces, whereas under parallel forces the lifting capacity is smaller. Additionally, even a slight gap {between} the magnet’s surface and the plate decreases the load capacity.