HH 42x8.8 [M6] / N38 - through hole magnetic holder

Advantages and disadvantages of rare earth magnets.

Besides their tremendous strength, neodymium magnets offer the following advantages:

• Their power remains stable, and after around 10 years it drops only by ~1% (according to research),
• Neodymium magnets are remarkably resistant to demagnetization caused by external field sources,
• A magnet with a shiny gold surface looks better,
• Magnets are characterized by extremely high magnetic induction on the active area,
• Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
• Thanks to the ability of precise molding and adaptation to individualized needs, magnetic components can be produced in a broad palette of shapes and sizes, which makes them more universal,
• Huge importance in innovative solutions – they find application in computer drives, electric motors, advanced medical instruments, and industrial machines.
• Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Disadvantages of NdFeB magnets:

• They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
• We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
• They rust in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
• Limited ability of creating nuts in the magnet and complex forms - recommended is casing - mounting mechanism.
• Health risk resulting from small fragments of magnets are risky, in case of ingestion, which becomes key in the aspect of protecting the youngest. Furthermore, small elements of these products can complicate diagnosis medical after entering the body.
• High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities

Maximum lifting force for a neodymium magnet – what contributes to it?

Magnet power is the result of a measurement for the most favorable conditions, taking into account:

• using a base made of mild steel, acting as a magnetic yoke
• with a thickness no less than 10 mm
• characterized by lack of roughness
• without any air gap between the magnet and steel
• for force applied at a right angle (pull-off, not shear)
• at temperature room level

Impact of factors on magnetic holding capacity in practice

Effective lifting capacity is affected by specific conditions, including (from most important):

• Space between surfaces – every millimeter of distance (caused e.g. by veneer or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
• Loading method – catalog parameter refers to detachment vertically. When slipping, the magnet holds much less (typically approx. 20-30% of maximum force).
• Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of converting into lifting capacity.
• Plate material – low-carbon steel gives the best results. Alloy steels reduce magnetic permeability and lifting capacity.
• Smoothness – ideal contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
• Temperature influence – hot environment reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

* Lifting capacity was assessed using a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, in contrast under shearing force the holding force is lower. In addition, even a small distance {between} the magnet’s surface and the plate reduces the lifting capacity.