UMGZ 48x24x11.5 [M8] GZ / N38 - magnetic holder external thread

Pros and cons of NdFeB magnets.

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

• They retain attractive force for around 10 years – the loss is just ~1% (in theory),
• Magnets perfectly protect themselves against demagnetization caused by ambient magnetic noise,
• The use of an metallic coating of noble metals (nickel, gold, silver) causes the element to look better,
• The surface of neodymium magnets generates a concentrated magnetic field – this is a key feature,
• Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
• Possibility of detailed creating and adapting to concrete needs,
• Wide application in modern industrial fields – they serve a role in magnetic memories, electric drive systems, precision medical tools, as well as complex engineering applications.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Characteristics of disadvantages of neodymium magnets and proposals for their use:

• To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
• We warn that neodymium magnets can reduce their power 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 advise using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
• We suggest casing - magnetic mount, due to difficulties in creating threads inside the magnet and complex forms.
• Potential hazard related to microscopic parts of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child health protection. Furthermore, small elements of these devices can complicate diagnosis medical when they are in the body.
• Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Highest magnetic holding force – what it depends on?

Information about lifting capacity is the result of a measurement for optimal configuration, assuming:

• on a plate made of structural steel, perfectly concentrating the magnetic field
• possessing a massiveness of at least 10 mm to ensure full flux closure
• characterized by even structure
• with total lack of distance (without impurities)
• during detachment in a direction vertical to the mounting surface
• at room temperature

Key elements affecting lifting force

In real-world applications, the real power is determined by several key aspects, listed from the most important:

• Gap between surfaces – every millimeter of distance (caused e.g. by varnish or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
• Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
• Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
• Steel grade – ideal substrate is high-permeability steel. Stainless steels may generate lower lifting capacity.
• Smoothness – full contact is possible only on smooth steel. Rough texture create air cushions, reducing force.
• Thermal factor – high temperature weakens magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

* Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under shearing force the load capacity is reduced by as much as 75%. Moreover, even a slight gap {between} the magnet’s surface and the plate decreases the lifting capacity.