UMGZ 75x34x18 [M10] GZ / N38 - magnetic holder external thread

Strengths and weaknesses of rare earth magnets.

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

• They virtually do not lose strength, because even after ten years the performance loss is only ~1% (in laboratory conditions),
• They possess excellent resistance to weakening of magnetic properties due to external magnetic sources,
• The use of an metallic coating of noble metals (nickel, gold, silver) causes the element to present itself better,
• They are known for high magnetic induction at the operating surface, which affects their effectiveness,
• Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling functioning at temperatures approaching 230°C and above...
• Thanks to versatility in shaping and the ability to customize to complex applications,
• Key role in advanced technology sectors – they serve a role in HDD drives, electric motors, medical equipment, and modern systems.
• Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which enables their usage in compact constructions

Disadvantages of NdFeB magnets:

• Brittleness is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a steel housing, which not only protects them against impacts but also raises their durability
• We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
• Magnets exposed to a humid environment can rust. Therefore when using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
• We recommend cover - magnetic mount, due to difficulties in producing threads inside the magnet and complex forms.
• Health risk to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child safety. Additionally, tiny parts of these products are able to be problematic in diagnostics medical after entering the body.
• Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Best holding force of the magnet in ideal parameters – what it depends on?

Magnet power was determined for optimal configuration, taking into account:

• on a plate made of structural steel, perfectly concentrating the magnetic field
• with a thickness of at least 10 mm
• with a plane free of scratches
• with zero gap (without paint)
• for force applied at a right angle (pull-off, not shear)
• at standard ambient temperature

Magnet lifting force in use – key factors

Effective lifting capacity impacted by working environment parameters, such as (from most important):

• Clearance – the presence of foreign body (rust, dirt, gap) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
• Load vector – maximum parameter is reached only during pulling at a 90° angle. The shear force of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
• Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of generating force.
• Steel grade – ideal substrate is high-permeability steel. Cast iron may attract less.
• Smoothness – full contact is obtained only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
• Operating temperature – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).

* Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a minimal clearance {between} the magnet’s surface and the plate decreases the holding force.