UMP 135x40 [M10+M12] GW F 600 kg / N38 - search holder

Pros and cons of NdFeB magnets.

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:

• They do not lose magnetism, even over approximately 10 years – the decrease in power is only ~1% (based on measurements),
• Magnets perfectly resist against loss of magnetization caused by external fields,
• By covering with a shiny layer of silver, the element presents an nice look,
• The surface of neodymium magnets generates a maximum magnetic field – this is one of their assets,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
• Thanks to flexibility in shaping and the capacity to customize to specific needs,
• Significant place in advanced technology sectors – they are used in hard drives, electric motors, precision medical tools, as well as other advanced devices.
• Thanks to their power density, small magnets offer high operating force, occupying minimum space,

What to avoid - cons of neodymium magnets and ways of using them

• Brittleness is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a steel housing, which not only secures them against impacts but also increases their durability
• We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
• They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
• We suggest a housing - magnetic mount, due to difficulties in producing nuts inside the magnet and complicated shapes.
• Possible danger related to microscopic parts of magnets pose a threat, if swallowed, which is particularly important in the context of child safety. Furthermore, tiny parts of these products are able to be problematic in diagnostics 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

Maximum lifting capacity of the magnet – what affects it?

Holding force of 680 kg is a result of laboratory testing performed under the following configuration:

• on a base made of mild steel, optimally conducting the magnetic field
• with a cross-section minimum 10 mm
• characterized by even structure
• without the slightest air gap between the magnet and steel
• under vertical application of breakaway force (90-degree angle)
• at conditions approx. 20°C

Impact of factors on magnetic holding capacity in practice

During everyday use, the real power depends on many variables, ranked from crucial:

• Distance (betwixt the magnet and the plate), since even a very small clearance (e.g. 0.5 mm) can cause a decrease in force by up to 50% (this also applies to paint, rust or debris).
• Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
• Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
• Material type – ideal substrate is high-permeability steel. Stainless steels may generate lower lifting capacity.
• Base smoothness – the smoother and more polished the plate, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
• Temperature – temperature increase causes a temporary drop of force. Check the maximum operating temperature for a given model.

* Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Moreover, even a minimal clearance {between} the magnet and the plate lowers the load capacity.