HH 16x5.3 [M3] / N38 - through hole magnetic holder

Pros and cons of rare earth magnets.

Besides their remarkable field intensity, neodymium magnets offer the following advantages:

• They retain attractive force for nearly ten years – the drop is just ~1% (according to analyses),
• Magnets perfectly resist against demagnetization caused by external fields,
• By applying a reflective layer of nickel, the element acquires an modern look,
• Magnetic induction on the surface of the magnet remains extremely intense,
• They are suitable for high-temperature applications, operating effectively at 230°C+ due to advanced heat resistance and form-specific properties,
• Thanks to flexibility in forming and the capacity to modify to specific needs,
• Universal use in innovative solutions – they serve a role in mass storage devices, drive modules, precision medical tools, also complex engineering applications.
• Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which allows their use in miniature devices

Characteristics of disadvantages of neodymium magnets and ways of using them

• Brittleness is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a strong case, which not only protects them against impacts but also raises their durability
• Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
• Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
• We recommend casing - magnetic mount, due to difficulties in creating nuts inside the magnet and complex shapes.
• Health risk resulting from small fragments of magnets are risky, if swallowed, which is particularly important in the context of child health protection. Furthermore, tiny parts of these devices can disrupt the diagnostic process medical when they are in the body.
• Due to complex production process, their price is higher than average,

Detachment force of the magnet in optimal conditions – what it depends on?

Magnet power is the result of a measurement for the most favorable conditions, assuming:

• using a sheet made of high-permeability steel, acting as a circuit closing element
• whose transverse dimension is min. 10 mm
• with an polished touching surface
• without the slightest clearance between the magnet and steel
• during detachment in a direction vertical to the mounting surface
• at temperature approx. 20 degrees Celsius

Practical aspects of lifting capacity – factors

Real force is influenced by specific conditions, such as (from most important):

• Distance (between the magnet and the metal), since even a microscopic distance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to paint, rust or dirt).
• Loading method – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
• Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
• Material type – ideal substrate is high-permeability steel. Cast iron may attract less.
• Plate texture – ground elements ensure maximum contact, which increases field saturation. Uneven metal weaken the grip.
• Heat – neodymium magnets have a sensitivity to temperature. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).

* Lifting capacity was assessed by applying a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, whereas under shearing force the holding force is lower. Moreover, even a small distance {between} the magnet’s surface and the plate reduces the lifting capacity.