KM HF - 11,3 kg - magnetic bracket

Pros as well as cons of rare earth magnets.

In addition to their pulling strength, neodymium magnets provide the following advantages:

• They do not lose power, even over around 10 years – the decrease in strength is only ~1% (theoretically),
• They have excellent resistance to magnetism drop when exposed to opposing magnetic fields,
• By applying a shiny layer of nickel, the element acquires an proper look,
• The surface of neodymium magnets generates a unique magnetic field – this is a key feature,
• 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...
• Due to the option of precise molding and adaptation to unique requirements, neodymium magnets can be produced in a broad palette of shapes and sizes, which makes them more universal,
• Wide application in innovative solutions – they serve a role in mass storage devices, electric drive systems, medical equipment, and technologically advanced constructions.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages of neodymium magnets:

• They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only protects the magnet but also increases its resistance to damage
• When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
• Limited ability of making nuts in the magnet and complicated forms - preferred is casing - mounting mechanism.
• Possible danger to health – tiny shards of magnets are risky, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that tiny parts of these devices are able to disrupt the diagnostic process medical in case of swallowing.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Breakaway strength of the magnet in ideal conditions – what affects it?

Magnet power is the result of a measurement for optimal configuration, taking into account:

• using a sheet made of low-carbon steel, functioning as a circuit closing element
• possessing a massiveness of minimum 10 mm to avoid saturation
• with a surface free of scratches
• with direct contact (without coatings)
• during detachment in a direction perpendicular to the mounting surface
• in temp. approx. 20°C

Magnet lifting force in use – key factors

In practice, the real power results from several key aspects, ranked from the most important:

• Air gap (betwixt the magnet and the metal), since even a microscopic distance (e.g. 0.5 mm) leads to a decrease in force by up to 50% (this also applies to varnish, rust or debris).
• Loading method – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet holds much less (often approx. 20-30% of nominal force).
• Substrate thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet limits the lifting capacity (the magnet "punches through" it).
• Material composition – not every steel reacts the same. Alloy additives weaken the interaction with the magnet.
• Smoothness – full contact is obtained only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
• Temperature influence – high temperature reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

* Lifting capacity was determined with the use of a polished steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, whereas under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a small distance {between} the magnet and the plate decreases the load capacity.