UMGGW 22x6 [M4] GW / N38 - magnetic holder rubber internal thread

Pros as well as cons of NdFeB magnets.

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

• Their power remains stable, and after approximately ten years it drops only by ~1% (according to research),
• Magnets perfectly protect themselves against demagnetization caused by ambient magnetic noise,
• Thanks to the glossy finish, the plating of Ni-Cu-Ni, gold-plated, or silver gives an visually attractive appearance,
• They show high magnetic induction at the operating surface, which affects their effectiveness,
• Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
• Possibility of individual shaping as well as modifying to atypical applications,
• Fundamental importance in modern industrial fields – they are commonly used in hard drives, motor assemblies, medical equipment, also complex engineering applications.
• Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which allows their use in miniature devices

Disadvantages of neodymium magnets:

• To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
• We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
• Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
• We suggest cover - magnetic mechanism, due to difficulties in producing threads inside the magnet and complicated forms.
• Health risk to health – tiny shards of magnets pose a threat, in case of ingestion, which gains importance in the context of child health protection. Additionally, tiny parts of these devices can complicate diagnosis medical in case of swallowing.
• Due to expensive raw materials, their price is relatively high,

Optimal lifting capacity of a neodymium magnet – what contributes to it?

Magnet power is the result of a measurement for optimal configuration, including:

• with the application of a sheet made of special test steel, guaranteeing maximum field concentration
• possessing a massiveness of at least 10 mm to ensure full flux closure
• with an ideally smooth touching surface
• without the slightest clearance between the magnet and steel
• for force applied at a right angle (pull-off, not shear)
• at room temperature

Impact of factors on magnetic holding capacity in practice

In practice, the actual holding force depends on several key aspects, listed from crucial:

• Gap (between the magnet and the plate), because even a microscopic clearance (e.g. 0.5 mm) can cause a decrease in force by up to 50% (this also applies to paint, rust or dirt).
• Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
• Element thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
• Chemical composition of the base – mild steel attracts best. Alloy steels reduce magnetic properties and lifting capacity.
• Surface condition – ground elements ensure maximum contact, which improves field saturation. Uneven metal weaken the grip.
• Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they lose power, and in frost gain strength (up to a certain limit).

* Lifting capacity was determined by applying a polished steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 75%. Moreover, even a minimal clearance {between} the magnet’s surface and the plate lowers the holding force.