UMGZ 42x20x9 [M8] GZ / N38 - magnetic holder external thread

Strengths as well as weaknesses of neodymium magnets.

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

• They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
• They possess excellent resistance to weakening of magnetic properties due to external magnetic sources,
• In other words, due to the reflective layer of silver, the element is aesthetically pleasing,
• Magnetic induction on the working layer of the magnet remains impressive,
• Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
• In view of the potential of free shaping and adaptation to individualized solutions, NdFeB magnets can be manufactured in a variety of forms and dimensions, which makes them more universal,
• Wide application in advanced technology sectors – they serve a role in HDD drives, electric motors, advanced medical instruments, and multitasking production systems.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons of neodymium magnets: application proposals

• At strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
• Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
• Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
• Due to limitations in creating threads and complicated shapes in magnets, we propose using casing - magnetic mount.
• Potential hazard resulting from small fragments of magnets are risky, if swallowed, which gains importance in the context of child safety. It is also worth noting that tiny parts of these devices are able to complicate diagnosis medical in case of swallowing.
• High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Maximum lifting capacity of the magnet – what it depends on?

The load parameter shown refers to the maximum value, recorded under ideal test conditions, meaning:

• on a block made of structural steel, effectively closing the magnetic field
• with a cross-section no less than 10 mm
• with an ideally smooth contact surface
• with direct contact (without impurities)
• for force acting at a right angle (in the magnet axis)
• in temp. approx. 20°C

Lifting capacity in real conditions – factors

Please note that the application force may be lower depending on elements below, in order of importance:

• Distance (betwixt the magnet and the plate), since even a microscopic distance (e.g. 0.5 mm) can cause a decrease in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
• Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet exhibits much less (often approx. 20-30% of maximum force).
• Steel thickness – too thin steel does not close the flux, causing part of the power to be escaped to the other side.
• Material type – the best choice is high-permeability steel. Cast iron may have worse magnetic properties.
• Plate texture – smooth surfaces guarantee perfect abutment, which increases force. Rough surfaces weaken the grip.
• Thermal factor – high temperature weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.

* Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, in contrast under parallel forces the lifting capacity is smaller. In addition, even a minimal clearance {between} the magnet’s surface and the plate reduces the lifting capacity.