UMGZ 20x15x7 [M4] GZ / N38 - magnetic holder external thread

Advantages and disadvantages of NdFeB magnets.

Apart from their notable power, neodymium magnets have these key benefits:

• They do not lose strength, even over nearly ten years – the drop in lifting capacity is only ~1% (based on measurements),
• They do not lose their magnetic properties even under external field action,
• By using a lustrous layer of silver, the element has an nice look,
• The surface of neodymium magnets generates a powerful magnetic field – this is one of their assets,
• Neodymium magnets are characterized by extremely 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 modularity in designing and the capacity to adapt to client solutions,
• Fundamental importance in advanced technology sectors – they are utilized in computer drives, electromotive mechanisms, diagnostic systems, and technologically advanced constructions.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages of NdFeB magnets:

• To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
• We warn that neodymium magnets can reduce their strength 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 suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
• We recommend cover - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complicated shapes.
• Possible danger related to microscopic parts of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child safety. It is also worth noting that small elements of these products can disrupt the diagnostic process medical when they are in the body.
• With large orders the cost of neodymium magnets can be a barrier,

Maximum holding power of the magnet – what affects it?

The lifting capacity listed is a measurement result conducted under specific, ideal conditions:

• using a base made of mild steel, serving as a circuit closing element
• whose transverse dimension is min. 10 mm
• characterized by even structure
• with zero gap (without paint)
• during detachment in a direction vertical to the plane
• at ambient temperature room level

Determinants of lifting force in real conditions

In real-world applications, the actual holding force results from many variables, listed from crucial:

• Distance – the presence of foreign body (paint, tape, air) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
• Loading method – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet holds significantly lower power (often approx. 20-30% of maximum force).
• Steel thickness – insufficiently thick steel causes magnetic saturation, causing part of the flux to be escaped into the air.
• Steel grade – ideal substrate is pure iron steel. Hardened steels may have worse magnetic properties.
• Surface condition – smooth surfaces ensure maximum contact, which increases field saturation. Rough surfaces reduce efficiency.
• Temperature influence – hot environment reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under perpendicular forces, however under shearing force the holding force is lower. In addition, even a slight gap {between} the magnet and the plate lowers the load capacity.