UMGZ 32x18x8 [M6] GZ / N38 - magnetic holder external thread

Strengths and weaknesses of rare earth magnets.

Apart from their consistent magnetic energy, neodymium magnets have these key benefits:

• They retain attractive force for around 10 years – the drop is just ~1% (in theory),
• They retain their magnetic properties even under external field action,
• In other words, due to the metallic finish of silver, the element is aesthetically pleasing,
• They are known for high magnetic induction at the operating surface, making them more effective,
• 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...
• Thanks to versatility in forming and the ability to customize to client solutions,
• Versatile presence in future technologies – they are commonly used in magnetic memories, motor assemblies, medical devices, and complex engineering applications.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages of neodymium magnets:

• Brittleness is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a special holder, which not only protects them against impacts but also increases their 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.
• They rust in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
• We suggest cover - magnetic holder, due to difficulties in realizing threads inside the magnet and complex shapes.
• Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which gains importance in the context of child health protection. Furthermore, tiny parts of these products are able to disrupt the diagnostic process medical in case of swallowing.
• Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

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

The declared magnet strength refers to the limit force, measured under laboratory conditions, namely:

• on a base made of mild steel, effectively closing the magnetic field
• whose transverse dimension reaches at least 10 mm
• with an polished contact surface
• under conditions of no distance (surface-to-surface)
• during detachment in a direction perpendicular to the mounting surface
• at temperature room level

Practical aspects of lifting capacity – factors

Holding efficiency impacted by working environment parameters, such as (from priority):

• Distance (betwixt the magnet and the metal), since even a very small distance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to varnish, rust or debris).
• Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
• Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
• Steel type – low-carbon steel gives the best results. Higher carbon content lower magnetic permeability and holding force.
• Base smoothness – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
• Thermal factor – high temperature reduces magnetic field. Too high temperature can permanently damage the magnet.

* Lifting capacity testing was carried out on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under parallel forces the holding force is lower. In addition, even a minimal clearance {between} the magnet and the plate reduces the lifting capacity.