UMGGZ 43x6 [M6] GZ / N38 - rubber magnetic holder external thread

Strengths as well as weaknesses of neodymium magnets.

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

• They have unchanged lifting capacity, and over nearly 10 years their performance decreases symbolically – ~1% (according to theory),
• They retain their magnetic properties even under external field action,
• By covering with a smooth layer of gold, the element has an aesthetic look,
• Neodymium magnets create maximum magnetic induction on a contact point, which increases force concentration,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
• Possibility of accurate creating and modifying to individual requirements,
• Key role in modern technologies – they serve a role in HDD drives, electric drive systems, medical equipment, as well as modern systems.
• Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Disadvantages of neodymium magnets:

• To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
• When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• Magnets exposed to a humid environment can rust. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
• Due to limitations in creating threads and complicated shapes in magnets, we propose using a housing - magnetic mechanism.
• Potential hazard related to microscopic parts of magnets can be dangerous, in case of ingestion, which gains importance in the aspect of protecting the youngest. Additionally, small components of these devices can be problematic in diagnostics medical in case of swallowing.
• Due to neodymium price, their price is relatively high,

Breakaway strength of the magnet in ideal conditions – what it depends on?

Information about lifting capacity is the result of a measurement for the most favorable conditions, taking into account:

• using a sheet made of mild steel, functioning as a magnetic yoke
• possessing a thickness of minimum 10 mm to avoid saturation
• with a plane cleaned and smooth
• without the slightest clearance between the magnet and steel
• for force acting at a right angle (in the magnet axis)
• in temp. approx. 20°C

Lifting capacity in practice – influencing factors

Real force is influenced by specific conditions, mainly (from most important):

• Distance (betwixt the magnet and the plate), because even a microscopic distance (e.g. 0.5 mm) can cause a decrease in force by up to 50% (this also applies to paint, rust or dirt).
• Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
• Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
• Steel type – low-carbon steel gives the best results. Higher carbon content decrease magnetic properties and holding force.
• Plate texture – ground elements guarantee perfect abutment, which increases field saturation. Rough surfaces reduce efficiency.
• Heat – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).

* Lifting capacity was determined with the use of a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas under parallel forces the load capacity is reduced by as much as 75%. In addition, even a minimal clearance {between} the magnet and the plate reduces the load capacity.